catamaran with solar panels

Silent Yachts

Creators of the world’s first series produced, solar-powered electric yachts.

Unlimited Range

Noiseless cruising, zero emission, minimal maintenance, pioneering solar powered yachting since 2009.

The Original Solar Yacht

As the original inventors of series produced solar-electric yachts, we pioneered this innovative approach. Our first model, the Silent 64, was launched to the market in 2016, several years before any other shipyard considered the possibility of going electric.

Leading Technology

Our founders began to research alternative energy sources to power yachts during the mid 1990s. Today, the technology of our in-house developed solar-electric drivetrain has been perfected and is multiple generations ahead in terms of reliability, performance and efficiency.

Historical Track-Record

In 2009, the Solarwave 46 was launched as our first prototype of a fully solar-electric, self-sufficient ocean-going catamaran. Since then, our electric yachts have cruised many 10.000s of nautical miles, performing flawlessly during a variety of weather conditions.

Enabling Self-Sufficiency

What differentiates a Silent is the unprecedented level of autonomy provided by our yachts. Being able to produce your own energy enables a fully self-sufficient lifestyle on board. Travel the oceans sustainably while making them your infinite playground.

The award-winning entry to solar-electric yachts.

Timeless design meets state-of-the-art technology.

120 Explorer

The boldest expression of solar powered yachting yet.

What Makes Us Unique

The tranquility on board of our yachts is unique. A lack of noise, fumes and vibrations create a deep connection with the sea. Luxury and sustainability finally merged into a holistic experience, working hand in hand with nature by minimizing the impact on the marine environment without compromising comfort.

For optimal performance and efficiency, our solar-electric drivetrain integrates seamlessly with all onboard systems. Compared to fossil fuelled powertrains of motoryachts, electric powertrains have very few moving parts, resulting in minimal maintenance, maximum reliability and significantly lower running costs.

The ability to recharge your own batteries with the sun marks a new era of freedom. Depending on cruising speeds and weather conditions, a Silent has virtually unlimited range, enabling you to live a fully self-sufficient lifestyle on board. Unbound by the limitations of fossil fuels, you are free to explore the horizons.

The technology powering our yachts today has been pioneered by our founders almost three decades ago. Continuous upgrading and steady optimization of the entire system are some of the key reasons our in-house developed solar-electric drivetrain offers a comprehensive portfolio of assurances and warranties.

Why Silent Yachts

A sensible approach to yachting which works in self-sufficient harmony with nature and creates a completely new experience on board.

Tech Corner

Why a Solar Powered Yacht?

Let’s break down the advantages of harnessing the sun’s energy for yacht propulsion: solar power offers remarkable efficiency, significant environmental benefits, and an unmatched synergy with the yachting experience. Join us as we dive into the future of sustainable yachting and discover how solar-powered yachts are revolutionizing the seas.

Living on a Silent 62 Solar Electric yacht

Silent Yachts’ range is designed to harness the power of the sun, providing green energy and silent cruising. But what can owners truly expect? How much power does the Silent 62 use while cruising? In this article, we evaluate a typical day onboard the Silent 62, based on actual data from our yachts.

Silent Yachts’ shining debut at the Venice Boat Show 2024

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New Silent Drivetrain

Tech shorts 2023

Electric power event on the water

Shipyard tour Italy by Michael & Heike

“The Tesla of the seas! An amazing founding couple, a highly innovative product as well as a really cool story behind it. Furthermore, a lot of love and attention has been invested into every single detail – truly impressive!” Frank Thelen / TV Personality, Founder, Angel Investor & Disruption Expert

While the present has brought us the dawn of smart cars, I strongly believe the future will bring us solar powered smart boats – and I definitely want to be at the frontline of that journey. Michael Jost / Former Head of Group Strategy of Volkswagen Group

The idea of sailing while charging your own battery is super powerful to me – solar powered sailing is the perfect love story! Jochen Rudat / Former Tesla Central Europa Director, Advisory Board Silent Group

Elon Musk single handedly forced an entire industry to go electric, as a matter of fact if they don’t all go electric now they will soon die. I would like to see the same thing happening for boating. You are not just selling boats – you are the actual leading edge of a crucial and much overdue revolution to sustainable transport!” Klaus Obermeyer / Emmy Award Winner

I am completely excited about solar catamarans. I knew before they are great but now I truly believe this is the future. After so many boats I’ve seen in over 18 years with Boote Exclusiv, this yacht truly blew my mind. Such a silent and peaceful cruising experience – just the way it should be. Martin Hager / Editor in Chief for Boote Exclusiv - Yachts

• solar electric yachts
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• Soel Shuttle 14
• Custom model

True ecotourism

no more fuel

The SoelCat 12 is an energy autonomous solar electric boat, designed from the ground up as a fully sustainable excursion vessel to enjoy the sea. The solar catamaran brings  true eco-tourism  to water-bound operators, communities, resorts, lagoons and nature reserves. With no CO2 or noise emissions involved, we can save the ocean and offer a better experience to our guests! The heart of the concept is  silence : being on board without any distractions lets the journey become the destination!

“Being on the solar catamaran gives you a feeling of total relaxation and freedom. The energy autonomous boat is powered by clean energies and we don’t have to worry about harming the environment with dirty exhaust fumes, fossil fuels or complicated maintenance! Our guests love the quietness and the openness of the vessel, which make every sunset cruise a very special moment!”

S. Dekeunynck, French Polynesia

electric from the start

The SoelCat 12 solar electric catamaran is integrally designed for electric propulsion right from the first line drawing to the matched propeller. Every aspect of this vessel contributes towards its highly efficiency for solar electric sailing. The lightweight yet durable fibreglass construction, the large solar roof and the super slender hulls are the major key factors for the solar vessel’s high performance when it comes to speed and range. The electric propulsion system for the SoelCat 12 is superior when it comest to volume and weight.

MOBILE POWER STATION

During downtime, the SoelCat 12 can utilise its large solar array to provide energy for your land based electricity grid. The solar electric catamaran then turns into a mobile power station and is able to feed 8.6kWp into the AC grid or provide power at remote places where no grid is available. The 120kWh  lithium battery  system supplies all the energy required for save operations during day and night.

SPECIFICATIONS

• Running Time (battery only)
• Running Time (with solar)

“Every detail on the boat is perfect – gorgeous spaces to relax, great spots to view the sunset or the marine life, and even a bar! My favorite moment of all was after sunset, when an incredible manta ray came to say hello, drawn by the underwater lights of the solar catamaran.”

S. Lee, New Zealand

fully customizable

The deck space of the solar electric boat can be customised to your wishes and host a variety of seating arrangements and layouts. Choose classic yacht fittings, luxurious and comfortable. Or practical and economical deck wear and simple bench setup for water taxi services. Furthermore, the electric catamaran can be equipped with a day head in the port side hull.  Get in contact with us now  to learn more about the different options and to discuss your personal requirements with your Soel Yachts contact partner.

The solar electric catamaran can be equipped with removable roll down screens on every side for flexibility in every situation. Screens for sun shading can be applied on good days, while transparent rain screens protect your guests in bad weather conditions. When the screens are not in use, the comfortable SoelCat 12 lounge layout offers spacious space options in the hulls and underneath the furniture.

SUSTAINABLE SEA TRANSPORT

With both the Okeanos Foundation and Soel Yachts sharing a vision of sustainable sea transport and striving for a healthier planet, we are honoured that our partner, the Okeanos Foundation has funded and supported the development of the SoelCat 12. The first SoelCat 12, named the ‘Okeanos Pearl’ is the first energy autonomous vessel for the ecotourism industry and will pave the way for more sustainable coastal water vessels in many different sectors. The Bora Bora Pearl Beach Resort is proving a pioneering spirit by operating the solar electric Okeanos Pearl. As the first resort, they are offering truly sustainable, noise and emission-free excursions in the pristine lagoon of Bora Bora to their guests.

Demountable

The SoelCat 12 can be delivered as a demountable solar electric boat, which fits into two 40ft high cube containers. Such compact dimensions enable ease transport of the catamaran at affordable rates to destinations all over the world. Neither lamination processes or specialized tools are required for the SoelCat 12’s quick assembly on location. For more details, please feel free to follow the link below and discuss your project requirements with your Soel Yachts partner!

Your project enquiry

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This New Solar-Electric Catamaran Comes With A Massive, Fold-Down Beach Club

Rachel cormack.

Cosmopolitan Yachts just unveiled an electrifying new catamaran.

The simply named Cosmopolitan 125 spans, you guessed it, 125 feet, making it the largest model in the burgeoning Spanish yard’s five-strong lineup. The zero-emission newcomer is also equipped with a hybrid solar-electric propulsion system that makes it cleaner and more efficient on the high seas than traditional diesel-powered yachts of a similar size.

The 125 features a lightweight aluminum exterior and sleek, modern lines. With a focus on sustainable luxury, the cat is replete with innovative, eco-friendly materials and the latest green technologies. Solar panels have been integrated into the rooftop, for instance. The yard didn’t share exact specs but says the yacht can traverse the seas sans emission at a cruising speed of 10 knots.

Described as a floating haven by Cosmopolitan, the multihull has an impressive interior volume of 500 GT and offers nearly 6,500 square feet of deck space. The living quarters are replete with “state-of-the-art amenities and luxurious finishes,” according to the yard.

The spacious layout includes four VIP guest cabins, one owner’s suite with a private terrace, three crew cabins, and a captain’s cabin. The guest accommodation is spread across the lower and main decks, while the owner’s cabin can be positioned on either the main deck or the bridge deck. The crew quarters are located on the lower deck, along with the crew mess, galley, and laundry.

The 125 offers more than just a place to sleep, of course. The main deck is home to a large living room with a TV and game area, while the upper deck is outfitted with a giant dining area and bar. A second bar and a gym can be found on the lower deck. Alfresco lounges are positioned forward and aft, while a helipad sits on the uppermost deck.

One of the standout features of the 125 is the beach club. The innovative platform is fitted with expandable terraces that open directly over the water to transform the stern into what Cosmopolitan calls “a private waterfront resort.” The sprawling space, which affords guests direct and easy access to the sea, can be used for sunbathing, swimming, or sundowners.

Cosmopolitan Yachts was founded by Christian Braun and Iván Salas Jefferson in 2021. Based in Barcelona, the yard specializes in custom aluminum catamarans with highly efficient electric propulsion systems. The range currently includes four models ranging from 70 to 111 feet and, of course, the electrifying new 125.

Cosmopolitan Yachts

Previously published on Robb Report USA

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CAT 12.0 Cruise

• up to 12 knots
• up to 4 hours
• up to 14 hours
• up to 25 Kw
• up to 160 kWh
• WC and shower
• layout cruise
• 50 -70 lt / h
• 31P + (Charts)

A truly sustainable cruiser catamaran with unlimited autonomy

A sustainable cruiser catamaran for an even more comfortable ride, cat 12.0 cruise specifications, energy & range, base equipment, gallery of cat 12.0 cruise.

Uniqueness of

Sustainable cruising and maneuverability.

With an unlimited range at low speeds and a maximum speed of 15 knots, the Sun Concept CAT 12.0 Cruise offers no compromise at sea. One of the very few compact electric catamarans, this 40-foot boat features exceptional torque at low revs, low drag and light weight, providing for excellent manoeuvrability and ease of use.

A Luxurious Floating Living Lifestyle

An energy-wise self-sufficient boat, the Sun Concept CAT 12.0 Cruise makes a luxurious floating living platform with sleeping spaces up to 7 persons. While the double cabins with private bathrooms are not overtly spacious making a perfect living space for 1-2 persons each, the helm is a truly transformable space where the dining table can give way to a double bed in moments and the transformable sofas are there if you need another sleeping place above deck.

View video reviews, onboard virtual tours and walkthroughs, sea trials and test drives of CAT 12.0 Cruise from the manufacturer and independent yachting experts.

Download PDF documents for the CAT 12.0 Cruise model including brochures with standard specifications, price lists featuring optional upgrades, performance charts and test drive data.

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Sunreef Yachts unveils new luxe solar electric Explorer catamaran with over 1,000 kWh in batteries

Sustainable boatbuilder Sunreef Yachts is adding a sleeker, lighter solar electric catamaran to its portfolio. The new Explorer Eco 40m is the company’s smallest electric yacht to date, but debuts with some of the most advanced technology, including Sunreef’s proprietary “solar skin”

Sunreef Yachts  was established in 2002 in Gdansk, Poland where its shipyard and office still operate alongside a newer footprint established at port in the United Arab Emirates. From its very first year, Sunreef has been pushing the boundaries of sustainable marine travel, launching the world’s first 74-foot luxury oceangoing catamaran with a flybridge.

Today, hundreds of Sunreef Yachts are sailing waters across the globe, showcasing the company’s lineup of sustainable luxury catamarans, all-electric propulsion, and advanced solar panels. That current portfolio consists of eco-friendly sailboats and massive solar electric catamarans ranging from 60 to 100 meters in length.

Today, Sunreef shared it has gone smaller, introducing a new 40m electric yacht called the Eco Explorer.

Sunreef Yacht’s latest electric catamaran is another beauty

Top comment by arno hayes.

I can't wait for ships to start using latent heat batteries with TPV. It might change the whole conversation about electric shipping. To a paradigm where nothing but electric shipping makes sense. Carbon variants can have volumetric energy density upwards of 1.5MWh/m3 (641kg). Though not all of that useable at maximum power output, I'm guessing. Let's call it 1MWh of useable energy. Pure guesstimate. You'd need 4000kg of 250Wh/kg LiIon batteries do the same.

I think a vessel as big as this would be capable of employing a storage system like that. And I believe that they will be suitable for trains and even larger airplanes. Maybe even trucks.

The company’s new Eco version of the 40m Explorer offers customers a sleeker and more sustainable design in a lighter marine footprint, all without sacrificing the luxury and comfort Sunreef is known for.

Sunreef shared that it favors catamarans over traditional yacht hull designs because require less energy to propel at sea – an important factor in marine electrification. The new Eco Explorer 40m features an ultralight composite build and a state-of-the-art electric powertrain consisting of two 540kW motors and two 550 kWh battery packs – giving the electric yacht the ability to cross oceans.

To support the all-electric powertrain, the Eco Explorer 40m is also covered in Sunreef’s proprietary solar skin, which utilizes every available inch of the hull and structure’s external surface to generate free, clean energy – more than enough to power the electric yacht’s onboard systems, HVAC, AV equipment and even its jacuzzi. Per Sunreef Yachts founder and CEO Francis Lapp:

Sunreef has been at the cutting edge of sustainable yachting since its launch. We are the only superyacht builder to have successfully developed the idea of embedding solar cells into large-scale fibreglass structures. But we’re not content to let technology alone do the work. Many elements of our wonderful, custom interiors can also be sourced from recycled and renewable materials. From hemp composite to recycled fabrics -it’s all up to the owner.

Sunreef says its new Eco Explorer 40m can accommodate 10 guests aboard, who can be taken care of by a crew of seven. Its motors deliver a cruising speed of 10 knots and a top speed of 14 knots. Build times are currently three years, and the electric yachts will be built at one of Sunreef’s ports in Poland or the UAE.

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Scooter Doll is a writer, designer and tech enthusiast born in Chicago and based on the West Coast. When he’s not offering the latest tech how tos or insights, he’s probably watching Chicago sports. Please send any tips or suggestions, or dog photos to him at [email protected]

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Recharge at Sea: Solar Catamarans Harness Sun-Powered Serenity

Just as a residential solar system makes a house independent of an electricity grid, a marine solar panel makes a yacht independent of a fossil fuel powered generator. Catamarans boosted by solar power systems are increasingly in demand in today’s day and age for their increased energy efficiency and reduced environmental impact.

Here is everything you should know about solar catamarans from Sunreef Yachts Eco :

An Introduction to Solar Catamarans

Derived from natural sources, renewable energy is replenished at a far higher rate than consumed. Of these, solar energy is the most abundant renewable energy resource on Earth that may even be harnessed during cloudy weathers. Additionally, because sunlight remains omnipresent, powering a watercraft with solar energy is a fitting concept.

Before we continue exploring the subject of solar catamarans, let us focus on the architecture. The twin hull structure of catamarans translates into a large beam, which provides ample space for solar panels installation. To top it off, catamarans have a fairly shallow draft that produces little to no drag, making them exceptionally energy efficient .

Marine solar panels are currently gaining substantial popularity amongst catamaran designers and manufacturers as a medium of supplying clean energy via a reliable source. Sunreef Yachts Eco is a pioneer in solar catamarans as we believe that the incorporation of a solar power system into yachts births an environmentally friendly yachting solution with a significantly reduced carbon footprint.

The Benefits of Solar Catamarans

The ocean is home to the largest continuous ecosystems; unfortunately, it also remains the most sensitive. Millions of people across the globe indulge in recreational marina and boating activities leaving behind pollution in their wake.

Here are three ways in which solar catamarans rectify commonly occurring hazards for the greater good of the environment:

1. Fuel (oil or gasoline) spills and the discharge of combusted fuels from engines readily contaminates water surrounding the marinas. This aggravates toxicity levels in water, resulting in increased pollutant concentrations in aquatic organisms and sediments.

For illustration, coral reefs, which are a vital source of nitrogen and nutrients for marine food chains and provide shelter for over one million aquatic species, are nearing extinction due to water pollution. Installing solar panels would, without a doubt, decrease the dependency of all types of watercrafts on non-renewable energy sources, i.e., fossil fuels, for operations and increase energy efficiency.

2. Noise from moving gas-powered ships cuts straight to the sea floor and back. These acoustic vibrations transmitting end-to-end affect marine animals to a great extent. Research suggests that human-caused noises result in disrupted behaviours, increased stress, and impaired feeding in marine life, leading to injury and death. Solar catamarans are far quieter than their combustion-driven counterparts; thus, they maintain the oceanic silence vital for the marine life as it enables communication and continuous growth.

3. The elimination of fuels also makes solar yachts more affordable to run and maintain in the long haul. In comparison to fuel powered generators, solar catamarans produce electricity at a lower cost since solar panels obtain power via the sunlight, a renewable source of energy that is present in abundance. But even if your catamaran utilizes both fuel and solar power, you are still to enjoy significant savings on fuel.   

Why Power A Boat with Solar Panels   

Apart from the obvious environmental factors, solar panels fulfil an important criterion for the oceangoing voyagers who do not wish to be left stranded far from land with a dead battery: unlimited backup power.   

On a typical sailing day, there is ample sunlight to ensure the backup battery restores enough power to generate electricity that keeps motors, electrical systems, and onboard appliances running. An added benefit of solar panels is that they continue to generate power even when the catamaran is at a standstill. This energy is stored in batteries for later use.   

Furthermore, unlike gas powered generators, solar catamarans do not produce excessive heat, are quieter, and experience little to no vibrations. This allows boat trips to remain pleasant for sailors and vacationers.   

Sunreef Yachts combines luxury with sustainability to offer noiseless, vibration-free, and fume-free cruising experiences. Launched under the Sunreef Yachts Eco flag, our sailing and motor yachts are powered using inhouse engineered solar panels that are fully integrated within their composite structure for optimal results. However, an additional asset for sailing solar catamarans remains the ability to combine eco motoring with wind propulsion with the use of high-performance kites.   

The Mechanism of the Solar Power System   

Classification of solar panels   .

There are various kinds of solar panels available for marine boats: adjustable panels, standard panels, and high-energy thin-film panels. While some may argue that having a portable solar panel makes it easier to relocate to where the sun shines the brightest, permanently mounted panels remain ready to go throughout the day.

Despite their long life, standard panels often fail to find a place in the marine industry as they compromise the space availability onboard. Hence, high-energy thin-film panels emerge as winners due to their ability of being permanently embedded on the solar catamaran’s bodywork without restricting living space.

The research and development team at Sunreef Yachts Eco developed the industry’s first composite integrated photovoltaic technology to produce highly efficient, shock resistant, flexible, and ultra-thin solar panels. This in-house engineered solar power system was recognized as a winner of the German Design Award 2022 in the category of Excellent Product Design: Eco Design .

Each solar panel consists of photovoltaic cells, compromising of a positive and negative layer for creating an electrical field. These are made of singly-crystal silicon, a semiconductor that absorbs the radiations of the sun to produce electrical power via the photovoltaic effect. For better understanding: the photovoltaic effect is the process of converting photons (a particle of light) to voltage.

Technical Specifications of Solar Panels

While the average solar panels’ weight lies between 8 to 15 kilograms per square meter, Sunreef Yachts Eco’s solar cells have a thickness below one millimetre and weigh only 1.8 kilograms per square meter. This makes Sunreef Yachts Eco the lightest marine solar power system producer in the solar catamaran market.

Each of the solar cells administered into the Sunreef solar catamarans are ISO 9001:2015 certified and offer a peak performance of ±24 percent, this is 25 to 30 percent more power compared to conventional cells. Despite this, these solar cells do not heat up excessively when receiving sunlight.

Integration Into the Solar Catamarans Structure

The orientation of the sun should be as such as that it hits the solar panels at a 90° angle for best performance. However, with the Earth rotating around its axis to produce a 24-hour day, it is non-viable to ensure the perfect angle throughout the day.

What is more is that the amount of energy produced may also differ depending on external factors, such as a building preventing direct sunlight from hitting the solar panels or light experiencing diffraction from the waterbody before contact. For this reason, it is best to invest in high-efficiency solar cells that generate maximum energy even from limited number of active panels.

Sunreef Yachts Eco makes the most of its solar catamarans’ space availability by spreading its “solar skin” across the hulls, mast, superstructure, bow terrace and bimini roof. Due to this arrangement, the solar panels receive ample sunlight at desired angles from early morning to late afternoon.

At the same time, light rays bouncing off the surface of water to the solar panels, in a process called reflection, also helps generate electricity. These superior performance solar panels possess great strength and durability to survive adverse conditions, year after year.

Generation of Electricity on Solar Catamarans

The crystals in marine solar cells are treated to enable the movement of electrons to generate an electric current. These silicon electrons activate only when in direct contact with sunrays. Instantaneously they start producing direct current (or DC) charges, which is captured by wires and stored in the batteries as energy.

At this point, a charge controller is employed as a regulator for the energy to transfer from the solar panels to the battery. It not only manages the energy load received by the battery, but also prolongs the battery life and performance by ensuring the battery is not overcharged or overloaded. Solar catamarans deploy multiple charge controllers depending on the energy produced.

While the current may be supplied directly to support the electrical demands of the catamaran, if the appliances demand alternating current (or AC), an inverter is added to the cycle to convert the DC to AC first.

Solar Catamarans in Action

But how much energy is enough energy? Working out a catamarans’ energy requirements requires summing up the energy consumed by each device onboard in watt-hours. For better understanding: energy is power accumulated over time, so if power is calculated in watts, energy is watt-hours.

Hence, the first step of installing solar panels dictates an extensive energy assessment of the watercraft. This requires checking the labels of every individual appliance onboard for its typical amp hours and volts used, be it the fridge, fan, or lightbulb. A battery monitor can also help measure energy consumed more accurately.

Depending on the size of the catamaran and the energy consumed, the solar panels size and wattage of power can be precisely determined. Multiple solar panels may be wired together to form a solar array for maximum energy generation. Aiming to fulfil the power needs of your catamaran with solar panels allows you to enjoy a quiet, peaceful anchorage.

Overcoming The Challenges of Solar Catamarans

While yacht solar panels resolve the problem for keeping the batteries topped up without running the generator, solar power systems are faced with challenges of their own. For starters, the harsh weather incurred at sea and saltwater splashing on or immersing the panels accounts for much damage.

However, technological advancements have enabled solar panels to withstand most of these environmental adversities. To illustrate, the installation and electronics linked with solar power systems have now become more resistant to short circuits and corrosion.

Sunreef Yachts Eco employs a unique photovoltaic integration technique in solar catamarans to give the panels extreme resistance to shock and abrasion. Even if the cell eventually cracks, the solid metal foundation remains intact to maintain a high-power output. Furthermore, these solar panels experience no light-induced degradation, no temperature coefficient, and favourable low-light and broad spectral response.

Likewise, the constrains of surface area for marine solar PVs have been addressed with the ability to manufacture customized solar panels. For instance, Sunreef Yachts Eco uses the lightest solar cells in the industry which offer unparalleled flexibility for placement on rounded surfaces of the solar catamaran while others break under pressure. Here solar panels are integrated vertically (on hull sides, flybridge sides, and mast) and horizontally (on front flybridge and bimini) to maximize energy generation.

While the Sunreef Yachts Eco’s solar panel system has a protracted life expectancy, any panels sustaining damage, due to adverse conditions at sea or other geographical circumstances, can easily be replaced. However, it is proven repeatedly that their performance remains unaltered over extended periods of time.

Efficiency of Solar Catamarans Vs. Diesel Yachts

Solar panels make for an ideal energy provider as they ensure the batteries always have power. This makes solar catamarans more self-sustainable and cost efficient to run in comparison to gas-powered ones. Additionally, fewer moving parts in solar catamarans call for significantly lesser maintenance in comparison to diesel yachts.

Boats of all shapes, sizes, and types (sail or motor) can be powered via solar energy to run all onboard appliances on battery. Apart from fulfilling the watercrafts’ day to day electrical usage, utilizing a renewable source of energy extends the durability and reliability of the catamaran.

But most importantly, a solar powered yacht compared to a standard diesel yacht has a significantly reduced carbon footprint. Ideally, with the use of solar power generation on catamarans, you would save 108.5kg of CO2 emissions per day or 39.6 metric tonnes annually.

Why Invest in A Solar Catamaran?

The wind in your hair, the sun on your face, and the sweet smell of the sea are one of the many joys of sailing. However, as an ocean enthusiast, it is crucial to calculate your impact on the environment. On average, the Sunreef Yachts Eco’s solar catamarans account for substantial electricity generation of up to 30 kWh, promoting a positive green footprint.

Today, solar catamarans are trending among yacht owners and shipbuilders as a clean medium to increase energy efficiency and reduce carbon emissions. Additionally, staying true to its legacy of yacht innovation and evolution, Sunreef Yachts Eco continues to work on advancements to its solar panels for improved performance, efficiency, and durability.

Evaluating the Sunreef Yachts Eco Solar Catamarans

Using advanced technology, Sunreef Yachts Eco has engineered ultra-thin, flexible solar panels with the best performance on the market. They are seven times lighter than the average solar power system, enabling them to be fully integrated into the composite structures, including curved surfaces.

The more surface area covered, the more electricity generated. The 80 Sunreef Power incorporates 200 square meters of solar panels (weighing about 360 kilograms) that deliver an astounding 40 kilowatts peak per hour. This setup alone produces solar energy equalling to two generators weighing 800 kilograms altogether.

Hence proven that Sunreef Yachts Eco optimized marine solar panel system outperforms a diesel generator both by weight and performance. Additionally, at reduced speeds, the Sunreef 80 Eco remains fully autonomous, running solely on solar power.

In light of sustainable yachting, Sunreef Yachts Eco has committed to launch over 40 models of its solar catamarans by the end of 2024; this includes a wide selection of sailing yachts, power yachts, and superyachts. Furthermore, Sunreef Yachts has begun commissioning a new range of technologically advanced hybrid ecospeeders, called the Sunreef ULTIMA , that would further extend their solar catamarans line up.

Future Innovations in Solar Catamarans

Despite the distinctive competency of Sunreef Yachts Eco in solar catamarans, the journey of innovation does not come to a halt. To further reduce our carbon footprint, we are undergoing ground-breaking research to redirect excess heat secured from direct sunlight on solar panels to the boilers of our solar catamarans.

Furthermore, Sunreef Yachts Eco is currently developing a concept of an all-new 90 feet sustainable sailing superyacht , called ‘The Zero Cat’ . Apart from sporting a solar power system, this catamaran will use a zero-emission generator to convert methanol to clean hydrogen for unlimited autonomy and greater self-sufficiency.

Frequently Asked Questions

• Why are solar catamarans favorable?  Because sunlight remains omnipresent, solar catamarans discern as a greener, cost efficient, and self-sustaining yachting solution . The environmentally friendly passenger conveyance from Sunreef Yachts Eco is consciously built to counter air, water, and sound pollution.
• What is a solar catamaran? A solar catamaran is a twin-hulled vessel powered by solar panels, harnessing sunlight to drive its propulsion and onboard systems, offering an eco-friendly alternative to traditional fossil fuel-powered boats. Powered using inhouse engineered solar panels, solar catamarans designed and manufactured by Sunreef Yachts Eco encourage a positive green footprint at sea. 
• Do solar catamarans exist? Launched under the Sunreef Yachts Eco flag, our sailing and motor yachts are powered using inhouse engineered solar panels that are fully integrated within their composite structure for optimal results. The Polish designer and manufacturer has also committed to launch 40 additional models of its solar catamarans in 2024.
• Are there any solar powered yachts? With an increasing demand for solar catamarans with increased energy efficiency and reduced environmental impact, Sunreef Yachts Eco has put to sea several variants of its sailing and power catamarans such as the Sunreef 60 Eco , Sunreef 70 Eco , Sunreef 80 Eco , and 80 Sunreef Power Eco
• What are the advantages of solar catamarans? The installation of solar panels reduces a watercrafts sole dependency on non-renewable energy sources for operations. In comparison to their combustion-driven counterparts, solar catamarans offer noiseless, vibration-free, and fume-free cruising experiences.
• How much is a solar-powered catamaran? With Sunreef Yachts Eco’s philosophy of promoting clean green yachting, the company has released a new range of solar catamarans , the Sunreef ULTIMA , with prices starting as low as €2M* for the 44 ULTIMA ECO . *Please note that all prices listed are subject to change at any time without prior notice.

ULTIMA RANGE

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10 SOLAR Boats 2023 & 2024 | Electric Yachts & Catamarans

With more steps being taken towards sustainable development, new, eco-friendly solar boats have been introduced in the world of green travel: solar electric catamarans. 

Solar boats are electric yachts that can go for long distances without needing to stop for fuel and without emissions. Those solar catamarans are interesting eco-friendly alternatives to the classic power boat or sailing yacht for cruising. However, there are also a few disadvantages that you should know about before purchasing one!

10 Solar boats, electric yachts & catamarans

Here are the best solar boats that will delight you with a top-notch sustainable yachting experience based on your requirements:

Sunreef Yachts – Eco 80 Sail Catamaran

• Silent Yachts – Silent 80 3-Deck

HH Catamarans – HH44

Silent yachts – silent 60, sunreef 43m eco (140 ft).

• Silent 120 Explorer
• 100 Sunreef Power Eco

Azura Marine – Aquanima 40

Soel yachts – soel senses 48, serenity yachts – serenity 64 (hybrid).

Here’s a quick summary of the features of the best solar catamarans for green yachting in 2023-2024:

If you are an advocate of sustainable yachting or sustainable tourism and are looking to buy an eco-friendly boat that doesn’t rely on fossil fuels , then you would do well to consider getting a solar catamaran. In this article, I will go through the pros and cons of 10 of the best solar yachts and superyachts that you can buy in 2023 and 2024!

It is also important to note that while there are solar panels for sailboats that you can fit on older models, those new boats have been specifically designed to maximize the use of renewable energy.

Most Luxurious + Most innovative solar system

The Eco 80 Sail Catamaran is one of the electric solar boats provided by Sunreef Yachts.

It features a unique “solar skin” that covers all composite structures on the boat, including hull sides, boom, mast, bimini, and superstructure. This green tech makes it possible to place solar panels where it wouldn’t normally be possible (like the hull and any other smaller but useful surface) and provide enough solar energy from every angle.

The boat is 80-feet long (24.38 meters) and includes electric motors that push it smoothly over the water without causing any vibrations or noise.

Besides being solar powered boat, the Eco 80 Sail Catamaran can also be powered by wind and hydropower. It is designed with a sail on its structure, allowing it to tap into wind power and supplement the solar.

The solar powered sailboat generates enough green power not only to propel the boat and keep it moving but also to charge the essential electric water appliances and other water-sport toys.

So far, the Sunreef Yachts Eco solar sailboats have earned a good reputation for being eco-friendly and sustainable. Besides, this solar powered catamaran takes its commitment to the environment a notch higher by using recycled materials , natural fibers, and non-toxic paints to create their boats.

It is no wonder that Sunreef Yachts have been winning environmental awards for so many years. This solar sailboat is one of the most remarkable boats you can ever invest in and it clearly shows the latest advancements in technology .

Prices: about $8 million USD

Where to buy : Sunreef Yachts .

• Larger surface covered with solar panels, that are installed also along the hull, and in other unusual areas.
• The batteries are 30% lighter than normal
• Unlimited cruising range.
• It runs silently and does not cause pollution.
• It has also traditional sails, so it can cruise also when it is not sunny without relying on batteries.
• Luxury, superb quality and finishing
• Great helm position.
• The solar catamaran is very costly (going for $8 million USD or more).
• The solar panels installed on the sides of the catamaran may not be appealing to the eye of all people.

Silent Yachts – Silent 80 Tri-Deck Solar Catamaran

Best pure electric

The Silent 80 Tri-Deck Solar yacht is popular for the large amount of space it offers.

This solar catamaran by Silent Yachts features three large decks that can be easily customized to fit the owner’s preferences and needs. The topmost deck can either be open or enclosed.

This solar powered yacht offers 4 to 6 cabins that are customizable, regardless of whether the deck remains open or enclosed. Besides, the top deck provides additional living space and can be used as a luxury master suite that opens onto a private space outdoors.

Where to buy : Silent Yachts .

• Purely electric propulsion that can be helped by the kite sail.
• The finishing, while being of high standards, doesn’t seem to be at the level of other options in its category.
• Quite costly, with prices starting at about $6 million USD.
• If going for a long cruise during cloudy days you may need to run the generator to keep going.
• The kite sail helps to give some propulsion using wind, but it is less effective than traditional sails.
• The absence of a traditional sail may make the boat a bit less stable, compromising a bit of the comfort while cruising.

Best for world cruising

HH Catamarans is a small boutique boat builder designing some of the most impressive solar boats for cruising, with one of their latest creations being the HH44.

The HH44 is a groundbreaking new boat that is designed to be eco-friendly and efficient.

The boat has a large battery bank that can be charged by solar panels, and also has two electric motors that can be used for electric propulsion up to 7 knots for up to 2h.

The HH44 has an innovative propulsion system named Eco-Drive. This is a parallel hybrid system that combines diesel and electric propulsion for long-range motoring and silent electric propulsion.

The boat also has two diesel engines, which can be used for long-range motoring or to generate electricity. The boat is also designed to be safe, with four propulsion devices plus sails and a large solar array.

The HH44 has a number of technical features that make it a groundbreaking eco-friendly design, including:

• 3 types of propulsion: full electric, standard diesel, and sail.
• 4.2 kWh of solar panels: generating power for recharging the lithium battery bank for solar .
• 10 kW electric motors (5kW each): mounted on the back end of each diesel engine for electric propulsion.
• The diesel engines can be used both for propulsion and as electric generators.
• Possibility to use the propellers to recharge the battery while the boat is sailing. Kind of like using hydropower to charge your solar batteries , pretty cool!

The HH44 is also a performance catamaran thanks to its C-shaped §daggerboards. Daggerboards are an essential component of many sailing vessels, providing both vertical lift and increased upwind sailing performance.

This solar powered yacht features up to 4 double cabins and 2 heads . Not bad for this world-cruising vessel!

If instead, you are looking for a larger boat, HH Catamarans also have other models up to 88ft.

This solar catamaran was also the preferred choice of Gone with the Wynns , a popular cruising YouTube channel. Here’s their announcement video:

Where to buy : HH Catamarans .

• A true performance world cruiser.
• Very resilient with 3 different propulsion modes (electric, sail, and conventional engines) and ideal for offshore cruising.
• It can run silently and without causing pollution.
• More affordable than other solar catamarans, starting from $1 mm USD
• Smaller than other options.
• The improved sailing performance requires narrower hulls, which reduces the available space onboard compared to other traditional vessels of similar size

Best mid-range

The Silent 60 is one of the smaller electric boats made by Silent Yachts. It is designed to be handled by at least two people. The users can either choose to include an additional crew or not.

Despite its outward small appearance, Silent 60 is very spacious and can accommodate a good number of people.

Besides, the electric yacht has a beautiful design that adds to its elegant and luxurious feel. It is usually designed with up to 6 cabins , with each cabin offering every basic amenity you need to have a luxurious stay on the yacht. In fact, the electric solar boat is equipped with everything you need to allow you to live on board permanently!

As someone who loves spending time on the water, I was really excited to learn about the Sunreef 43M Eco: a superyacht that is both eco-friendly and luxurious.

I was especially impressed by the solar power system, which is built into the composite structures of the yacht, and the large hydraulic platform which creates a vast walkaround beach club.

The interior of the solar superyacht is just as impressive as the exterior, with a variety of sustainably-sourced materials and fabrics used throughout as well as energy-saving air-conditioning. The Sunreef 43M Eco can welcome up to 12 guests in the most luxurious conditions.

Silent Yachts – Silent 120 Explorer

Here’s another incredible solar super-yacht by Silent Yachts. The Silent 120 Explorer is a truly unique yacht, designed to explore the world in style and comfort.

Powered by solar energy, this solar catamaran is perfect for those who want to enjoy the beauty of the open seas without worrying about the impact on the environment.

With plenty of space for guests and all the amenities you need onboard, the Silent 120 Explorer is the perfect choice for your next adventure. If you’re looking for a yacht that combines luxury and environmental responsibility, the Silent 120 Explorer is a perfect choice.

The company didn’t yet release detailed information, however, this superyacht seems to be even featuring a helipad under the roof’s solar panels!

The Silent 120 Explorer has plenty of room for guests and all the amenities you need onboard. So if you’re ready to embark on your next great adventure, be sure to consider the Silent 120 Explorer, which will likely start being delivered in 2023.

The 100 Sunreef Power Eco

Sunreef recently launched and sold their first 100 Sunreef Power Eco catamaran, a transatlantic luxury craft that takes solar boat design to the next level.

With massive living space, great autonomy, and impressive features like a flybridge that can be transformed into an outdoor cinema, the 100 Sunreef Power Eco is the perfect vessel for cruising in supreme luxury

This catamaran uses the latest innovations in solar power to achieve outstanding energy efficiency, and its ultralight battery bank provides for silent cruising and infinite range.

The fully customizable interior and exterior make this catamaran a truly one-of-a-kind option, and its use of ethically-sourced and eco-responsible materials is sure to please even the most discerning buyer.

If you’re looking for an electric yacht that is both luxurious and eco-friendly, the 100 Sunreef Power Eco is certainly a great option for you if you can afford it!

The most affordable $

The Aquanima 40 catamaran is entirely powered by solar energy. It features creative adaptations and unique innovations that make it eco-friendlier and more economical boat than other solar-powered catamarans. For example, the solar panels installed on the electric catamaran are built in such a way that they can sell any excess solar energy back to shore stations when connected.

The exterior of the Aquanima 40 has an elegant design. Also, the interior is not only aesthetically pleasing, but also very clean and modern.

The boat is designed with 2 single cabins for the crew and 2 double cabins for guests.

Indeed, this solar boat by Azura Marine is one of the most economical and cost-effective options you can go for when buying a solar catamaran.

• Relatively fast.
• Ideal for short vacations.
• The most affordable solar catamaran, starting at about $0.6 million USD.
• Much smaller than other options.
• Not recommended for long cruises.
• Basic looks and layout.

As its name suggests, the Soel Senses 48 is 48 feet long. It has a slender design and is lightweight , making it more economical than most other solar-powered boats.

The boat is designed with two sleeping berths that can accommodate two people each. It also includes a salon that can offer enough sleeping space for four people. 

Compared with most other solar yachts, the Soel Senses 48 has a much smaller size. Its size, adding to its sleek and innovative design, give it faster speed than other solar-powered boats.

It incorporates 12 solar panels installed on the roof ; all these panels generate a combined electrical power of up to 2.7 kWh. The electricity generated by the solar panels is then stored in two batteries which can be easily configured to hold a maximum solar power of 142 kWh.

Like other Soel Yachts, the Soel Senses 48 glides smoothly over water without causing any noise, rattles, or generating fumes.

It has average cruising speeds of 10 knots, even reaching top speeds of up to 18 knots. However, the solar catamaran cannot run at its top speed for long periods.

Both the interior and the exterior of the Soel Senses 48 have a sleek and modern design. Every single component of the solar catamaran has been designed carefully to make it as functional and comfortable as possible. Therefore, when you board on this boat, you can expect to experience one of the best sailing experiences of your life.

The Serenity 64 Yacht features a diesel engine. It is a hybrid solar boat, which means that it can run on either solar power or on diesel.

The diesel engine especially comes in handy when the users wish to achieve faster cruising.

The solar catamaran is a very spacious electric boat and provides plenty of living space. It is built with four luxurious cabins, with each cabin having its ensuite bathroom. And even though the Serenity 64 is smaller than the Serenity 74 model also built by Serenity, it still provided an elegant feel and a smooth sailing experience.

Solar Boats Pros and Cons

The sun is a powerful and free source of energy, making solar power an attractive option for those looking to power their yacht. Solar panels can be used to generate electricity to run the yacht’s lights, appliances, and even the engine. Solar power can also be used to heat water for showers and laundry. But, what are the pros and cons of solar catamarans?

Here’s a quick summary of the solar yachts’ advantages and disadvantages:

One of the main benefits of solar power is that it is renewable and environmentally friendly. Solar panels have no emissions and do not produce pollution. In principle, they also do not require fuel, making them very cost-effective in the long run. Solar power is also very reliable, as the sun is a constant source of energy.

There are a few disadvantages to solar power. Solar panels can be expensive to install, and while they require less maintenance, this can be quite costly, especially when it will come time to replace the batteries. Solar panels also need to be pointing directly at the sun to be effective, so they may not generate power on cloudy days or at night.

But there’s more, let’s see what some sailing experts are thinking about solar catamarans!

Sailing expert’s solar Boat review

Recently, one of the most popular sailing YouTube channels, Saliling La Vagabonde , published a very honest and interesting review of the solar powered yacht Silent 55. Here’s a summary of their experience:

• 7 Days onboard (6 nights)
• Travelled 145nm with an average speed of 7 knots
• Generator used for about 12h (in total)
• Fuel consumed: 208 liters

Here are some interesting observations they made:

• While cruising it may feel less stable than a standard sailing boat because it doesn’t have a sail to stabilize it when hitting the waves.
• For the Silent 55 it was possible to move at about 3 knots by using only the power generated by the solar panels (without using the batteries) on a sunny day. This means that if you are moving the solar yacht around quite frequently, you will end up using the generator quite a lot to produce the necessary power.
• When the batteries are out of power, the Silent yacht is using a (diesel) generator to supply the necessary power to keep the boat moving and to power the appliances.
• A great luxury yacht with all the comforts and going in the right direction for the future of the sector.
• Overall, the Silent Yacht is a great eco-friendly alternative to a power boat , while if you are thinking about cruising around the world, you would be probably better off going for a standard sailboat (or for some of the hybrid alternatives mentioned in this article, like the HH44).

Why are solar yachts all catamarans?

Solar yachts are all catamarans for 2 main reasons:

• Catamarans have a larger surface, which allows for placing more solar panels and also offers more room for the batteries onboard.
• Catamarans have efficient hulls for their size. This reduces their power consumption while moving.

This makes catamarans the ideal platform to build a solar-powered boat.

Modern solar electric boats are undoubtedly an eco-friendly choice in sea travel and a form of green tourism . Not only do these electric boats provide a smooth sailing experience, but they also reduce the release of emissions into the atmosphere, reducing the environmental impact and enhancing sustainability .

Luckily, given their size, solar catamarans can charge themselves (unlike electric cars ), so they can sail indefinitely without the need to stop for refueling.

If you are environmentally conscious and looking to get a boat that is more viable, desirable, and eco-friendly, you may consider investing in one of the solar yachts discussed in this article!

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This New Solar-Electric Catamaran Comes With a Massive, Fold-Down Beach Club

Cosmopolitan Yachts just unveiled an electrifying new catamaran.

The simply named Cosmopolitan 125 spans, you guessed it, 125 feet, making it the largest model in the burgeoning Spanish yard’s five-strong lineup. The zero-emission newcomer is also equipped with a hybrid solar-electric propulsion system that makes it cleaner and more efficient on the high seas than traditional diesel-powered yachts of a similar size.

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The 125 features a lightweight aluminum exterior and sleek, modern lines. With a focus on sustainable luxury, the cat is replete with innovative, eco-friendly materials and the latest green technologies. Solar panels have been integrated into the rooftop, for instance. The yard didn’t share exact specs but says the yacht can traverse the seas sans emission at a cruising speed of 10 knots.

Described as a floating haven by Cosmopolitan, the multihull has an impressive interior volume of 500 GT and offers nearly 6,500 square feet of deck space. The living quarters are replete with “state-of-the-art amenities and luxurious finishes,” according to the yard.

The spacious layout includes four VIP guest cabins, one owner’s suite with a private terrace, three crew cabins, and a captain’s cabin. The guest accommodation is spread across the lower and main decks, while the owner’s cabin can be positioned on either the main deck or the bridge deck. The crew quarters are located on the lower deck, along with the crew mess, galley, and laundry.

The 125 offers more than just a place to sleep, of course. The main deck is home to a large living room with a TV and game area, while the upper deck is outfitted with a giant dining area and bar. A second bar and a gym can be found on the lower deck. Alfresco lounges are positioned forward and aft, while a helipad sits on the uppermost deck.

One of the standout features of the 125 is the beach club. The innovative platform is fitted with expandable terraces that open directly over the water to transform the stern into what Cosmopolitan calls “a private waterfront resort.” The sprawling space, which affords guests direct and easy access to the sea, can be used for sunbathing, swimming, or sundowners.

Cosmopolitan Yachts was founded by Christian Braun and Iván Salas Jefferson in 2021. Based in Barcelona, the yard specializes in custom aluminum catamarans with highly efficient electric propulsion systems. The range currently includes four models ranging from 70 to 111 feet and, of course, the electrifying new 125.

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New Silent Yachts For Sale

Silent yachts are the industry leader in ocean-going production yachts that are completely solar sustainable and powered by solar energy. seaworthy, luxurious, and built to impeccable standards, silent yachts are already desirable without its solar capabilities. with the abundance of solar panels on board each boat, every silent yachts model is able to cruise for 100 nautical miles in complete silence. even while at anchor, the solar-powered generators keep the yacht powered quietly for an unprecedented boating experience. enjoy all the benefits of a power catamaran with the addition of solar energy..

Silent Yachts

Silent Yachts 80

Silent Yachts 55

Speak To A Silent Yachts Sales Professional

Silent Yachts offer an environmentally conscious choice when it comes to owning a yacht. Silent Yachts currently offers three solar-powered power catamaran models including the Silent 55, Silent 64, and Silent 80. United Yacht Sales is proud to be the U.S. distributor for Silent Yachts and can assist you in your search for the world's first solar-powered yacht. For more information, please contact United Yacht broker Darren Sell at (561) 351-7333 or by email at [email protected] . 

Where are Silent Yachts built?

Silent Yachts are built through two different shipyards depending on the model. The Silent 55 is built at the world-class shipyard of Mazarin German Yachts which also has a production site located in China. For over 70 years, Mazarin has been a leader in quality yacht construction with over 400 yachts delivered. Mazarin are experts in innovative construction processes that are able to produce light weight yachts.

The Silent 64 and Silent 80 are produced at the Italian-based shipyard Consorzio Navale which is a prestigous consoritum of builders and sub-contractors in the industry. The group has serviced many of the major Italian yacht brands such as Ferretti Yachts and Riva Yachts . Additionally, the Silent Yachts 80 features styling and design by Marco Casali and naval architecture by Insenaval.

Are Silent Yachts really completely solar-powered?

The short answer is yes. Owners can choose to go 100% solar-powered or install diesel engines should higher speeds want to be achieved over longer distances. Silent Yachts can cruise up to 100 miles per day by power acquired through its solar panels. Every day the solar panels are able to generate more power than the total consumption needed for propulsion at cruising speeds plus powering all of the appliances on board. 

How does the solar power work? 

The Silent Yachts power system feeds the electric propulsion of the power cat and all of the energy it needs to run the A/C, refrigerators, and other household appliances. Light-weight lithium batteries provide an ample amount of energy for everything on board. The lithium batteries used in Silent Yachts are the most expensive ones on the market, but also the most reliable, safe, and have the longest life span.

Solar panels are integrated to the roof of the flybridge hardtop sections instead of just being bolted on top, resulting in no wind load or resistance againest them. Below is a video explaining how the system functions and operates back when Silent Yachts were originally called "Solar Wave":

Who is the team behind Silent Yachts?

Heike and Michael Kohler have sent almost their entire lives on a boat. After more than two decades of using various boats, cruisers, and sailboats on multiple oceans, they became dedicated to finding a better energy source for the propulsion of yachts. Between the years of 2005 and 2009, Heike and Michael tested a number of a multitude of various alternative energy sources. In 2009, SolarWave 46 was launched as a proof of concept for their design. While there are many boats and yachts built that use solar power in some fashion, the Solarwave 46 was the first ocean-going yacht to use solar energy to power everything on board from engines to appliances.

What else is different about how Silent Yachts are built?

Certainly the solar-powered engines and generators are the distinguishing characteristic, but there are a lot of other features that make each Silent Yacht unique. For example, the molds were created using a CNC-milling machine that is able to contruct particular shapes for an optimized design. The materials used in the hull include a carbon compositie that is then resin-infused for a light-weight, but very strong platform. Every hull is fully insulated and the long-term durability is exceptional thanks to the high-quality resin used in the infusion process.

What propulsion systems are recommended by Silent Yachts?

Silent Yachts recommends the 2 x 135 engines as the best solution. If the owner is making frequest trips from Point A to B (Say Miami to the Bahamas for example) the faster hybrid is recommended. The main differentiator here is cruising speed. If the owner is living on the yacht for an extended period of time, rarely pushes the engines to top speeds, and stays below 12 knots, then the E-Power is recommended.

When the generator is running, does the 100Kw go to charging the batteries (which run the 250 Kw e-Motors) or directly to the e-Motors?

All of the enery consumers and producers are connected to the bus bar. If there happens to be more power produced than consumed, the excess power goes to re-charge the batteries. If for some reason more power is required than what is produced, the needed power comes from the lithium batteries.

What is the sustained speed if both 100 Kw generators are running?

This answer really depends upon sea condition and the weight of the boat (for example components, additional equipment, water toys, etc.). The sustained speed on average though is between 12 and 14 knots, 10 knots with one generator running. It is possible to cruise at 10 knots without a generator running when using the Solar E-Power.

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Solar Powered Yachts

Solar panels are a fundamental element of today’s quest for responsible energy generation. Used in households, commercial facilities, and power stations across the globe, they are also a vital source of energy for solar powered yachts. With significant progress made over the last years, photovoltaic technology has emerged as the natural energy source with the most exciting growth potential.

Thanks to photovoltaic cells, solar panels absorb sun radiation to generate direct current (DC). When sunlight reaches a solar cell, it causes silicon electrons to move. This motion will start the flow of electricity that is captured by wires and directed to an inverter. Inverter technology is then used to convert it to alternating current (AC) ready to power household appliances.

The solar power systems on solar powered yachts usually consist of solar panels, batteries, charge controllers and inverters. While batteries store the energy obtained from the solar panels, charge controllers prevent batteries from overcharging. Solar catamarans with house appliances on board will usually need to convert the DC energy into AC with the help of an inverter.

Sunreef Yachts produces solar panels in-house and uses a new (patent-pending) technology to integrate them within structural components. The panels are made of the industry’s most efficient cells with a peak performance of 24%.

Thanks to the solar cells’ outstanding flexibility, Sunreef Yachts’ solar panels can be mounted on any surface of the solar powered yacht. As a result, they are integrated with various areas on board, such as hull sides, mast, superstructure, bimini roof or bow terrace to maximize energy generation.

With a thickness below 1mm and weighing around 1,8 kg per square meter (average solar panels will weigh between 8 and 15 kg per square meter), they are one of the lightest solar power systems in the world. In addition, tests have proven that thanks to their advanced integration technique, Sunreef Yachts solar panels have a very high resistance to shock and abrasion. This allows them to be used on any surface, including hull sides.

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9 Best Solar Panels for Sailboats

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Solar panels have become game changers when it comes to supplying power while off the grid. Marine solar panels can charge anything from batteries to computers to bigger electronic appliances. What are the best solar panels for sailboats? 

The 9 best solar panels for sailboats are: 

• Renogy Flexible Solar Panel
• Newpowa Solar Panel
• SunPower Flexible Sol ar Panel
• Eco-Worthy Off-Grid Solar Panel
• Rich Solar Polycrystalline
• Topsolar Flexible Solar Panel
• HQST Monocrystalline Solar Panel
• WindyNation Solar Panel Complete Off-Grid
• DOKIO Solar Panel Kit

This article will explore everything you need to know about the best marine solar panels. 

Table of Contents

Solar Panels on Sailboats: An Overview

Before exploring the best solar panels, it is helpful to consider how solar panels on sailboats work and how many you need. Solar panels sit on different parts of a sailboat’s surface and absorb the sun’s rays, converting them into energy. This energy is used to power chargers, fridges, cooking stoves, and other electronics you need for self-sufficient sailing. 

Worth noting is that today we will only discuss solar panels and not the batteries, which of course is an essential part of a complete system; we will also not discuss charges or charge controllers.

The products in this post will get you started in the right direction, but if you’re looking for a high-output system, then I suggest you contact someone that can help you calculate your energy requirements.

How Many Solar Panels Do I Need for My Sailboat?

You will need between 2-8 solar panels for your sailboat. The exact amount depends on your sailboat’s space and how many electronics you need to power. Most solar panels can absorb between 100-300 watts per hour. On average, you will need approximately 1500 watts of power each day. 

If your solar panels absorb 1500 watts daily, here’s what they can power on your sailboat: 

• A laptop charger
• A microwave 
• A coffee maker 
• An induction cooker 

If you want to power more heavy-duty electronics like a washing machine or a television, look for solar panels that absorb 400 watts. For heavy-duty electronics, try installing 5-8 solar panels. 

Flexible vs. Rigid Solar Panels

The three main types of solar panels are rigid panels, flexible panels, and semi-flexible panels.

Rigid panels are surrounded by aluminum and made with sturdy tempered glass. They are resilient against various weather conditions but require flat space to install. 

Semi-flexible panels can be slightly bent to fit the shape of the installation surface. However, they can’t absorb a lot of power. 

One very common type of solar panel used on boats is the flexible panel . Flexible panels are thin and lightweight, and, as their name suggests, they can be added to a wide variety of surfaces. 

Here are the pros of flexible panels: 

• They are thin and light. Flexible panels are approximately one-eighth the weight and size of rigid and semi-flexible panels. This allows you to add them to various sailboat sizes and surfaces. It also reduces the load on your sailboat. 
• They are easy to install. Flexible panels are easy to work with and can be self-installed by following the instructions that come with the panels. Meanwhile, rigid and semi-flexible panels may require expert installations. 
• They’re sturdy. Despite being light, flexible panels can bear a lot of pressure – you can easily walk over them. 

However, there are also some drawbacks to using flexible solar panels: 

• May fly away . As flexible panels are fragile, they can easily be dislodged and fly away, especially in strong winds. 
• Vulnerable to scratches . While flexible panels can bear much weight, they may get scratched more easily. Over time this may affect their functionality. 
• Not easy to reposition. Flexible panels are generally adhered to the surface of a sailboat using a specially prepared adhesive. Because of this, it is challenging to reposition the solar panels when there is a change of season.
• Less efficient. Flexible solar panels don’t convert energy to electricity or rigid panels. It may be harder to power heavy-duty appliances from a flexible solar panel. 

How Many Panels Can I Fit on a Sailboat (Catamaran and Monohull)?

The amount of panels you can fit on your sailboat depends on the size of the panels and the surface space you have available. 

You can fit at least two 400W panels on a Monohull and at least four on a Catamaran around 35ft in length. You will be able to fit 4-8 more solar panels if you add a solar panel bracket at the stern. 

Renogy Flexible Solar Panel 100W

Renogy is a popular solar panel producer that designs high-quality solar panels. The Renogy Flexible Solar Panel is specially designed for marine vehicles, including sailboats. 

Here are the best features of this solar panel: 

• Flexibility . These solar panels are fragile, making them flexible and easy to mount on served surfaces. 
• Easy to install. These are made with high-quality Monocrystalline, allowing them to be easily bent and easy to install. 
• Lightweight. One solar panel weighs only 4 pounds, ensuring that no extra pressure or weight is displaced on your boat. 
• Durability . User reviews have noted that these panels are highly durable and can last you a few years. 
• Users have noted that these panels do not have the best outputs. They also can’t be stacked, which impacts their accessibility. To ensure that these panels can be connected, you may purchase extra extension cords. 

Newpowa Rigid 160W Solar Panel

The Newpowa Right Solar Panel is a new design with a maximum power of 160W. It is weather-resistant and can be used on various surfaces and vehicles. 

Here are the pros of the Newpowa Solar Panel: 

• Weatherproof . The design features of this solar panel ensure that it survives under a range of different weather conditions. It has a heavy-duty frame preventing it from strong wind and waves. Its mainframe has a further layer of protection for the Junction box. 
• Long warranty . Newpowa offers a 25-year transferrable output power warranty. 
• Easy to install . These solar panels are made with mono cells and bypass diodes. Consequently, the solar panels can be immediately unpacked and are ready to install. 
• High wattage. As these solar panels have 160 Watts of power, you need less of them to power all the devices on your boat. 
• If you are planning on buying the Newpowa Solar Panel, you should note that they only make rigid panels. As a result, you may find it to be difficult to install them on curved spaces.

SunPower 110W Flexible Solar Panel

SunPower’s Flexible Solar Panels are made with high-quality materials ensuring durability. They are especially ideal for sailboats as their warranty also covers saltwater damage. 

Here are the standout features of the SunPower 110W Flexible Solar Panel: 

• Flexibility . This solar panel can be bent up to 30 degrees, making it easy to install on various surfaces. 
• Easily portable. These solar panels are incredibly lightweight (4.4 pounds or 2 kilograms) and can be easily uninstalled and transported. 
• Extended warranty . SunPower offers a five-year warranty on power and a two-year warranty on the product. The warranty includes damage caused by saltwater which many other solar panel warranties do not. 
• Some users have noted that the output quality of these solar panels deteriorates over time. However, you can use the extended warranty to address any quality deterioration. 

ECO-WORTHY Rigid 25W Off-Grid Solar Panel

This is a rigid, 25-watt solar panel that is waterproof, making it ideal for your boat. It is highly durable and has inbuilt indicators that highlight the battery’s status. Its low output makes it only suitable for charging phones or smaller electronics.

Here are some notable features of the Eco-Worthy Solar Panel: 

• Ease of use. This solar panel is easy to install and requires no maintenance. 
• Warranty. Eco-Worthy offers one year of warranty on all of its products and free maintenance if needed. 
• USB control. This solar panel is attached to a USB control panel, preventing it from overcharging and getting damaged. 
• Waterproof. All solar panel parts are entirely waterproof and can handle exposure to both saltwater and freshwater. 

Some of the drawbacks to this solar panel include: 

• Low watt absorption. Unlike many of the other solar panels on this list, this one can only absorb up to 25 watts of power at a time. So, it can only power smaller devices like batteries. 
• Instruction manual. Some users have noted that the instructions to set up the Eco-worth solar panel are confusing for beginners. If you have never installed solar panels before, it’s best to call in an expert to help. 

RICH SOLAR 100W Rigid 12V Polycrystalline

This 100W rigid solar panel is designed to absorb energy even in low light conditions. It is easy to install and ideal for marine environments. 

Here’s why you should consider buying Rich Solar Panels: 

• Works well in low light. This solar panel has been tested in various low light conditions, including cloudiness and during sunrise and sunset. It is certified to be able to harvest energy in low light conditions. 
• Extended warranty. Rich Solar Panels offers a 25-year warranty on limited power output and a five-year warranty on quality. 
• Water and weatherproof . The Rich Solar panels have used selective design elements to ensure they are water-resistant. They have high transparency and are made with tempered glass to withstand high winds and water pressure. 
• Cost-effective . These are significantly cost-effective, making it easy to equip your sailboat fully. 
• While solar panels can easily resist strong winds and water, they can be vulnerable to hail. Hail storms can cause dents on the solar panels, which can eventually cause damage. 

Topsolar Flexible 100W Solar Panel

Topsolar provides premium flexible solar panels that are easy to move and install. They are ideal for installing on water vessels like sailboats with waterproof materials. 

Here are some of the pros of choosing the Topsolar Flexible Solar Panel: 

• Flexibility . The arc radius of this solar panel is 16 inches (40 centimeters) and can be bent to fit several curved surfaces allowing your solar panel to harvest the most sun. 
• Efficiency . These solar panels are made with ETFE (ethylene tetrafluoroethylene) materials. They are extremely energy efficient and can rapidly convert energy. 
• Some users have noted that these solar panels don’t have as long a life as other panels. In addition, some panels may only be able to absorb up to 75 watts of power at a time. 

HQST Rigid 100w Monocrystalline Solar Panel

This is a 100-watt solar panel that has been specially designed to perform well in low light. It is made with high-quality materials and is ideal for sailing boats as it is durable even in unfavorable weather conditions. 

Here are the pros of installing the HQST Solar Panel: 

• Durability . These solar panels are designed to withstand strong winds and snowfall. They’re made with tempered glass and aluminum and are resistant to corrosion, ensuring longevity. 
• Testing and warranty. Each solar panel is quality tested before it is distributed. It also comes with a three-year warranty. 
• Easy to install . While these are rigid solar panels, they have pre-drilled holes, making them easier to install. 

WindyNation 100W Solar Panel Complete Off-Grid

As its name suggests, this solar panel is designed for off-the-grid living and is helpful if you need to access power when you’re in the middle of the sea. 

Here is why you should consider the WindyNation Solar Panel: 

• Includes a charge controller. This controller lets you quickly see the amount of power the solar panel has absorbed. 
• High power. Several positive user reviews have indicated that this solar panel is highly efficient in absorbing and converting power. 
• This solar panel is more expensive than many others on the market.

DOKIO 300W 18V Portable Solar Panel Kit

If you are looking for a heavy-duty solar panel, the Dokio Solar Panel Kit is excellent. It can absorb a lot of energy and power a wide range of appliances on your sailboat. 

Here’s why you should consider this solar panel: 

• Versatile and flexible. While this is a rigid solar panel, it can be folded, making it easy to transport and install. 
• High efficiency. This solar panel is highly efficient at converting energy into power. As it absorbs up to 300 watts, you can install just two of these panels to get significant energy. 
• Some users have noted that this solar panel does not work well in low-light conditions. You may want to have a backup solar panel for days when it’s rainy and windy. 

Here are Some of My Favorite Catamaran Cruising Resources

Thank you for reading this article. I hope you found it helpful as you hopefully start your sailing adventures. Here are some resources that I use as a sailor that I hope you’ll also find helpful. These are affiliate links, so if you do decide to use any of them, I’ll earn a commission. But in all honesty, these are the exact things that I use and recommend to everyone, even my own family. Sailboats: If you’re looking for the best boat to suit your needs, I would recommend a catamaran. If you’re interested, I can show you the differences between catamarans and other types of sailboats .

Books:  For getting started, I really like  Cruising catamarans made easy . It is actually a textbook from the American sailing association; it is used to get a cruising catamaran certification. There are some other great books, and I have compiled a list of books about cruising catamarans that you will find useful.

Communication:  Being out on adventures, whether it be sailing or climbing mountains, good communications are essential to being safe. I recommend two things Google fi (incredibly simple cellular data all over the world) and Garmin inreach mini (for text and voice in remote areas without cell coverage)

Sailing courses: Online sailing courses are great for beginners starting out their sailing career; it’s an efficient way of learning the basics of navigation, throttle controls, and maritime safety. I suggest starting with two free courses from NauticEd .

To see all my most up-to-date recommendations,  check out this resource  that I made for you!

Owner of CatamaranFreedom.com. A minimalist that has lived in a caravan in Sweden, 35ft Monohull in the Bahamas, and right now in his self-built Van. He just started the next adventure, to circumnavigate the world on a Catamaran!

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Discover the Top Power Catamarans for 2024

• By Yachting Staff
• Updated: September 10, 2024

Power catamarans have seen a surge in popularity, growing both in size and appeal. These cruise-focused yachts offer homelike comfort, fuel efficiency and user-friendly operation, making them a favorite among avid travelers. Their popularity extends to the bareboat charter market for the same reasons.

In this article, we explore the world’s top power catamarans, ranging from a 36-footer ideal for a cruising couple to a 78-footer perfect for entertaining friends and family. The propulsion options are diverse, including outboards, diesel inboards, hybrids, and even all-solar setups.

Top Luxury Power Catamarans

The following power catamarans are all vessels we’ve reviewed. They are listed in no particular order.

• Fountaine Pajot MY44 : A family-oriented cat suitable for long-range cruising and aimed at owner-operators. 
• Silent Yachts 60 : This is a catamaran that can cruise comfortably for long distances using emissions-free solar-electric propulsion.
• Horizon PC74 : With interior and deck space like a much larger vessel, the PC74 is perfect for cruising the Bahamas and Caribbean.
• Aquila 36 : This beefy 36-footer is an outboard-powered, express-cruiser-style catamaran.
• Lagoon Seventy 8 Powercat : A spacious design, this vessel fits the volume of a 130-foot-long monohull into just 78 feet of length overall. 
• Horizon PC68 : This cat has a stable ride, long range, volume to spare and intriguing layout options.
• Two Oceans 555 : An elegantly simple yet luxurious 55-foot custom with the space and amenities of a much larger vessel.
• Lagoon 630 : From its open salon to its spacious decks, the Lagoon is a comfortable and luxurious platform.
• Fountaine Pajot MY5 : A midsize cruiser with serious big-boat space for family and friends. 
• Prestige Yachts M8 : The voluminous 65-footer lets owners customize onboard spaces.
• Aquila 47 Molokai : Calling all anglers: This cat has 60-plus-knot speed and is set up for serious bluewater adventure.

Fountaine Pajot MY44

The  Fountaine Pajot MY44 , a creation of Italian architect Pierangelo Andreani and French designer Daniel Andrieu, has a main deck that’s open from the aft-deck seating all the way forward to the starboard helm station. The sense of spaciousness is significant, for several reasons. First, four glass panels aft can all slide to port, creating an indoor-outdoor space with the aft deck and salon. In the salon, 32-inch-high windows extend for 12 feet down the sides of the yacht, with three sections per side, bringing in natural light along with the three forward panes that comprise the windshield. Finally, 6-foot-6-inch headroom provides vertical clearance, with a 21-foot-7-inch beam that adds interior roominess while keeping the yacht stable.

Quick Specifications

Silent Yachts 60

Solar panels, ocean-crossing range and self-sufficiency define the electric Silent-Yachts 60 power catamaran. If there was any question that the “Tesla moment” has arrived in yachting, the Silent 60 clearly provides a positive response. Consider, for a moment, crossing oceans in silence at 5 to 6 knots without consuming a drop of fuel and never needing to plan your course between fuel stops. Imagine sitting at anchor and running the air conditioning all night, not to mention all the galley appliances plus the washer-dryer, without the hum or fumes from a genset.

Horizon PC74

As founder and director of The Powercat Company, a Horizon Power Catamarans distributor, Stuart Hegerstrom had long believed that catamaran builders needed to design their yachts to more stylish standards.

“The boats were very boxy,” he says, based on his years of experience with cats in the charter market. He and his partner, Richard Ford, asked Horizon to produce models that had high-end finishes and looked good inside and out.

The Horizon team brought in mega-yacht designer JC Espinosa to work with its own craftsmen. The result aboard the  Horizon PC74  is a catamaran with exterior styling, layout and functionality that should appeal to private and charter owners alike.

The Aquila 36  is a departure from her sisterships in that she is an outboard-powered, express-cruiser-style catamaran, but she also adheres to MarineMax’s philosophies.

With a single main living level from bow to stern and a beam of 14 feet 7 inches, the Aquila 36 is like a bowrider on steroids. She has seating that can handle 20 adults for outings and barbecues, and there are two staterooms below, one in each hull, for family weekending. The staterooms have nearly queen-size berths, en suite heads, stowage and 6-foot-6-inch headroom.

Lagoon Seventy 8 Powercat

Lagoon is a division of Groupe Beneteau, the world’s largest builder of sailing yachts, and the  Lagoon Seventy 8 Powercat  is a developmental sistership of its Seventy 7 super sailing cat. The Seventy series yachts are built at Construction Navale Bordeaux in France, which had to add a new yard to construct these catamarans because they require separate stern molds for the power and sail versions.

Horizon PC68

Multihull yachts ride differently than monohulls, often counteracting the sea’s motion for a smoother, more stable ride. On the Horizon PC68 , sharp hull entries make head seas seem gentle, and a Humphree stabilization system with blades reduces roll. Horizon uses SCRIMP construction for resin saturation that maximizes strength with an 111,112-pound displacement. And with a 5-foot-4-inch draft, the PC68 invites island cruising.

Two Oceans 555

With 27-knot speed, house-like volume, an on-deck master and top-tier tech, the Two Oceans 555 is a formidable power catamaran. Dave Jirikovic of HMY Yachts was on a quest. The sales broker was looking for the meanest, nastiest patch of Gulf Stream he could find to show a potential client what the Two Oceans 555 power cat could handle. And just as he had intended to show us, the broad-shouldered power cat didn’t even notice. He even dropped the single-lever throttles back to idle and left the 25-foot-wide Two Oceans 555 beam-on to another set of square-edged seas. The 55-footer brushed that off too. Jirikovic tried quartering into the seas—never a happy angle for catamarans—and the yacht drowsed through them.

Fitted with the optional twin 300-horsepower Volvo Penta D4 diesels, the  Lagoon 630 MY  burns only 1.64 gph total at 6 knots, giving a theoretical range of 2,952 nautical miles with standard tankage of 793 gallons. Hull No. 1 had an optional 502-gallon tank, giving it transatlantic range.

Luxury, stability and economy are all hallmarks of Lagoon’s return to luxury motor yachts. If you can take a ride, it will be worth your time.

Fountaine Pajot MY5

The flybridge deck on the Fountaine Pajot MY5 is a standout feature, offering virtually unobstructed 360-degree ocean views and an elevated beach club vibe. Aft of the off-center starboard helm is a spacious area perfect for entertaining, complete with a wet bar, refrigeration center, and ample seating. It’s the most popular space aboard according to the builder. And if the weather turns for the worse, a second helm station in the saloon allows the skipper to pilot the MY5 in climate-controlled comfort.

Prestige Yachts M8

How fitting it was that Prestige Yachts introduced its new M-Line flagship, the M8 , at Portopiccolo, a picturesque yachting village outside Trieste, Italy. Formerly a quarry, the cliff-side area had been chiseled into a clean site rife with eye-catching vistas, much like the French builder’s 65-foot power catamaran and its nearly 3,000 square feet of usable real estate.

Aquila 47 Molokai

With every boat, there’s an origin story. In the case of the Aquila 47 Molokai power catamaran, it starts with MarineMax, which saw people renting boats for bareboat charters. MarineMax Vacations was born. After experimenting with several production yachts, the company decided to build its own: the Aquila line, designed for charter as well as for sale to owner-operators.

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Catamaran Solar Panels

Catamaran solar panels come in all sizes and shapes for use in many areas of boats to generate extra energy. With today’s modern multihulls and all their amenities like electric winches, full-size American fridges, watermakers, and our love of energy-sucking kitchen gadgets, planning for all your energy needs is a vital plan, especially if you are ocean-going or liveaboard.

Solar panels make it easier to meet those demands.  

Solar panels convert the sun’s incoming radiation (light) directly into electricity, which can be used to charge batteries and operate DC loads. It’s becoming more popular among sailors not only because they can keep lights and appliances running, but also because they are quieter than wind generators (and, of course, diesel generators). The source of energy replenishment is also free and abundant (after initial investment). We have had solar panels on our cruising catamarans that we have owned and thus have first-hand experience at how wonderful a source of supplemental energy aboard can be.

Solar Panels Add Convenience to Sailing

On our Island Spirit catamaran years ago, we had solar panels and a wind generator. We found we could easily have done without the wind generator to serve our daily amp needs. The wind generator was noisy and, because it had moving parts, it required maintenance.

The advantage with the wind generator is that it works 24 hours a day versus the solar which only charges the batteries when the sun is shining. While underway, it is nice to have the additional power from the wind generator, but for some, it may not outweigh the annoyance of constant noise especially at anchor. 

Modern electronics such as auto pilots and LED lights have become very energy efficient, which means that the battery drain is not as great as they once were. But we all have become used to more conveniences like watermakers and big fridges.

Solar panels can easily keep up with the demand, especially when combined with an hour of engine generation per day or other power accommodations.

Our Lagoon 450S, Zuri, had no wind generator and two 230W solar panels with an additional house battery. We found that this setup worked well as liveaboards whether sailing offshore or cruising locally. In my opinion, the more energy generation we can fit on the boat that is in solid state and requires no maintenance, the better. Our Bali 5.4,  Z3 , that we sailed in the ARC Rally soon after taking possession of her had a hydrogenerator which we highly recommend especially for ocean crossings. Check out our tips on energy management aboard your boat for the pros and cons of solar panels, wind turbines, hydrogenerators, and more. 

There are many reasons to consider using solar energy for your yacht:

• Yachts with no access to shore power need to keep batteries topped off.
• Cruising yachts to augment charging options.
• Boats without auxiliary engines may use solar power for all onboard uses.

What to Look for in Catamaran Solar Panels

When selecting solar panels for your boat, there are several important questions you should ask yourself:

• Is it necessary for the panel to be flexible? The thin film panels are the only ones that flex more than a little. They can be mounted on curved surfaces like a dodger.
• What is the cost per watt of output of the panel? Large hard panels generally have the greatest output per dollar.
• Are you limited in the area available for solar panel coverage? The highest efficiency panels are the monocrystalline type.
• Will it be difficult to protect the panel from partial shading during the day? Thin film panels are more tolerant of shading.
• Will the panel be used in high temperatures? If so, consider a higher voltage panel, or a thin film.
• How much energy will you need? Match your marine electrical needs to the right size of panels and batteries.

Estimate Your Boat's Energy Usage

The first step in answering these questions is to estimate your vessel’s energy usage. It takes some time but is easier than you think.

Download our Vessel Energy Estimator spreadsheet to help you create a comprehensive assessment of the draw of current for each piece of equipment (tip: confirm with a panel ammeter to increase accuracy) and the number of hours you estimate tor that you operate each appliance daily.

SUBMIT THE FORM BELOW TO GET THE ESTIMATOR SPREADSHEET EMAILED TO YOU

Estimate Battery Storage

Once you understand the energy demands of your vessel and its crew, estimate the battery storage capacity you will need.

Write down the number and capacity of your batteries. Keep in mind that drawing below 50% charge will shorten their life, and that when away from the dock, you will rarely charge past 85%. This means that you should plan for using only 35% of your battery configuration’s nameplate capacity.

Determine Your Boat's Solar Energy Needs

Keep in mind that you may other charging sources in addition to the solar you are planning to upgrade or add: engine, wind, hydrogenerator, and solar. So total the energy produced by all your energy generation sources.

Note for your solar estimate, use the rated wattage x 5 hours/12 = amp-hours while on passage and wattage x 7 hours/12 = amp-hours while at anchor (sails do not shade and the boom can be rigged out to the side). This is below the rated capacity and keep in mind that sailing in the tropics will produce more than higher latitudes. And sailing in the winter will produce less from solar. 

Fine-Tune Your Solar Panel Output Estimate

Keep in mind how external factors will affect solar power generation:

• Full sun with panel square to the sun: 100%
• Full sun with panel at 45° angle to sun: 71%
• Light cloudy overcast: 20-70%
• Heavy overcast: 10-20%

Determine how you will use the solar energy combined other energy sources by answering these questions:

• How many days can you manage with lower solar energy generation?
• Are you and your crew willing to cut back on non-necessity use during extended inclement weather?
• Will you periodically recharge by running the engine or at dock?
• Are you living aboard or a long-term cruiser who will  value more abundant power or are you an occasional cruiser who may be fine living with less power availability? See our tips below for saving energy aboard a boat.

Tips on Saving Power while Aboard

Every amp-hour (AH) you use requires a trade-off in weight of and investment in solar panels or other power generation equipment. If you run your engine for power, you have higher maintenance costs such as oil changes (and noisy, stinky smell, as well as higher environmental impact).

Reducing power consumption by 50 AH/day can reduce your need to add a battery, a 120-watt solar panel, and other accessories such as a mounting arch. The solar power system savings could be $500 and 150 pounds of carrying weight for small power consumption compromises.

Here are some ideas for where you can almost painlessly cut power usage:

Lighting. Swap out all incandescent and halogen bulbs to LED or fluorescent lighting. To space out investment, especially for pricier LED bulbs, start with lights you use most often. Consider starting with the anchor, saloon, and cockpit lights. If you rarely run at night, you can postpone changing out the running, steaming lights, deck light,  and some task lights. 

Change Your Bedtime. Go to bed early and rise with the sun to give yourself a large savings in power consumption and and more play time.

Gas Solenoid. If you use a gas solenoid to run appliances like your propane fridge and cabin heater, it is running for long periods. Consider turning it off at night. Also, consider if you can go without refrigeration sometimes.

Refrigeration. Chill provisions before bringing them aboard, if possible. Deep chill your fridge and freezer at lower temperature ranges using shore power at least 24 hours before leaving the dock. Then set your temperatures higher while cruising. Invest in high-efficiency refrigeration units and consider that top-entry fridges/freezers are usually more efficient. Regularly check your refrigeration unit doors and lids for good seal and promptly replace old or compromised gaskets.

Refrigeration Planning. Using your refrigeration appliances efficiently with good habits can significantly reduce energy consumption. Organize your food when you provision, arranging it in the order you plan to use it and in such a way that you don’t have to hold the door open for extending periods of time looking for something. Using dividers and creating foam compartments to arrange food by temperature can be helpful as they reduce the amount of cold air that escapes when open the unit.

Watermaker.  In addition to refrigeration, watermakers can be your biggest energy consumer even with today’s higher efficiency models. Avoid draining your batteries or running engines or the generator by running the watermaker while you’re motoring or when it is sunniest (or windiest if you also use wind generation). And, of course, use water sparingly.

Air Circulation. Run fans on low speed and watch the hours. A wind scoop does not consume power.

Instruments. Consider turning off some power-hungry instruments such as your GPS or radar for parts of your passage. Minimize the autopilot load by balancing the sails. Use an energy-efficient computer with Energy Star certification and a solid state drive as everyday tasks such as checking grib files or blogging can be astonishingly energy hogging.

Estelle Cockcroft

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2 thoughts on “Catamaran Solar Panels”

Curious your thoughts on after market vs factory installation of panels. My initial thought is we can get higher quality at a better or same price. Thank you for the above things to consider, it was helpful.

Hi Marta, in my experience the factory supplied panels are not that good so aftermarket you will be be able to get higher capacity and quality panels at a similar price. Note if you have to have a custom bracket to mount the solar array this could push the price a bit higher but worth it.

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