catamaran electric tarnita

The ZEN50 is a game changer. World’s first series production catamaran equipped with a wingsail, it defines a new distinctive class of its own, where genuine zero-emission meets high comfort and performance, limitlessly. 

Designed from scratch for ZEN Yachts by award-winning naval architect Julien Mélot , this full carbon catamaran is the ultimate essence of technology driven, high performance and luxurious, eco-friendly leisure yachting. 

The blue water capable ZEN50 lightweight racing carbon hulls are combined with a huge solar roof for an unrivaled solar power vs. displacement ratio above 1:1 (18 kW / 17 tonnes), making this yacht completely energy self-sufficient. A revolutionary, fully automated, wingsail - by Ayro© - can be added as a range and speed extender. The yacht’s high capacity battery bank powers a powerful silent electric propulsion, allowing the ZEN50 to achieve 14 knots and maintain high continuous speeds in unrivaled safety and comfort, indefinitely… 

The ZEN50 is offered with or without wingsail and comes in 3 main different versions: Racer, Cruiser and Explorer, each dedicated to a different usage and owner profile. We use these versions as a basis to define a final, bespoke specification for each of our valued clients and ZEN Community Members. Scroll down for more details, specifications and prices.

1st WINGSAIL series production yacht in the world!

The OceanWings32 - by Ayro© - was initially developed for Team Oracle, for the America’s Cup 2010 in Valencia. Over years, it has further been developed and automated by VPLP and was installed on Energy Observer in 2019. Two years of field feedback have allowed the Ayro team to fine tune the algorithm commanding the wingsail. The ZEN50 is the first series production leisure craft to be equipped with this fully automated wingsail. It is controlled at the touch of a finger on screens, is automatically adjusted and has several safety modes and features. The two parts of the wingsail can be hoisted and lowered independently and with the simple touch of a button. The wingsail OceanWings32 is the ideal complement for the solar roof for those wishing to cruise long distances off-shore with zero-emissions.

Greatest ratio SOLAR POWER / weight on the market

At 17 tonnes lightweight and 18,000 W of peak solar power, the ratio of the ZEN50 is at over 1 kW per displaced tonne of water or beyond 1:1 which is far beyond any other blue water CE Cat A yacht in this size range. Lots of solar power for little water to displace is the strong and healthy foundation the energy self-sufficient ZEN50 is built upon.

Performance CARBON sandwich hulls

The hulls of the ZEN50 have been designed from a blank screen for ultimate efficiency - understand minimum drag or minimal energy consumption for a range of speeds from 6 to 10 knots. Their shape is aggressive, sharp and slender. Their reverse bows cut through water like a sword cuts through butter and their curvature is reminiscent of graceful dolphin bodies. These hulls are undoubtedly of the performance type and are built with the best available composites: Carbon fibre and Corecell™. The combination of high strength, low weight and performance design allow the ZEN50 to reach speeds of up to 14 knots.

INFINITE range at high CONTINUOUS speeds

With maximized solar and wind power and minimized energy consumption… the ZEN50 can sail continuously at speeds varying between 6 and 10 knots. Thorough simulations in various sea states and weather system have consistently shown the ZEN50 will be able to achieve performance catamaran speeds continuously without using a genset. With the ZEN50, the world is your oyster and the wildest destinations are within your reach with this self-reliant vessel!

True ZERO-EMISSION operation

The first ZEN50 unit, whose construction started in March 2023, will not be equipped with a genset at all and will not have any fossil fuels onboard. The ZEN50 energy system with its very large capacity 160 kWh battery bank, has been designed to function for days in complete safety with minimal solar energy harvest and no wind. It is perfectly safe with no backup genset and operates 24/7 without any polluting emissions.

NO FUEL , no costs

Naturally, requiring no fuel to operate day in day out is great news for the environment, it is also fantastic news when sailing into remote areas where fuel bunkering might be near impossible or where the fuel quality might be an issue. Finally, it also makes a massive difference in this yacht’s costs of operation. Imagine the hundreds of liters of diesel saved over just a week, the obsolete engine maintenance schedules, the clogged filters and dirty tanks from another age… Welcome to a new burden-free, energy self-sufficient era, welcome to clean and graceful eco-yachting, welcome to ZEN Yachts.

Highest SAFETY & reliability

At ZEN Yachts, we have made some design choices to attain energy self-reliance with the ZEN50 that reduces the habitable volume in the hulls, similar to performance catamarans. Where we have not and will never compromise is on safety. Our main voltage system is 48V making it perfectly safe to work on. The level of redundancy of the batteries and solar panels is 10! The main electrical architecture is split in 2 so that should anything happen on 1 hull, the entire vessel can still operate normally. There are 2 independent helm stations and the ZEN50 is packed with special safety features, nonsubmersible compartments and we can even offer an in-depth practical course on safety equipment usage and management. Sailing with the ZEN50 is not only exhilarating and clean, it is ultra safe!

Unrivaled space & COMFORT

The ZEN50 offers the speeds of a performance catamaran, the comfort of a large motor yacht and the simplicity of an electric car. No less than 2 large day beds, 3 dining areas for over 10 people, 1 professional galley and 2 wet kitchens, 5 heads, up to 4 double ensuite cabins, 1 bunk double and 1 single together with both saloon and dining areas converting into extra sleeping areas, this is simply unrivaled on a 50 ft. catamaran. Add an electric tender, dive compressor, satellite internet, 2 helm stations (cockpit and flybridge), a solar roof that converts into a gigantic upper deck to enjoy the most epic sunrises and sunsets, welcome onboard the ZEN50!

SPECIFICATIONS

Main particulars.

• Length Over All: 15.7m

• Beam: 8.4m

• Depth Molded: 2.7m at midship

• Displacement (light) : 17 T

• Draft (design): 1.3m (4.3ft) incl. keel

• Passenger Capacity: 12

• Berths: 12 (4 x double + 2 x single + saloon)

• Building Material: Carbon Fiber - Corecell™ composite

• Certification: CE Cat A - Unrestricted with 12 persons

Note: Some of the above figures may vary between versions

PROPULSION & ENERGY

• Propulsion: 2 x 50 kW brushless DC motors

• Main Battery Pack Capacity: 160 kWh Lithium

• Solar Roof Peak Power: 18 kWp

• Wingsail: Oceanwings® OWS 3.2 by Ayro©

• Backup Battery Pack Capacity (Nav/Com/Wing): 5 kWh Lithium

• Main System Voltage: 48V - Low voltage for total human safety

• Accommodation Voltage: 110V or 220V

SPEED & RANGE

• Max. Speed on e-motor only: 10 kn

• Max. Speed on e-motor & Wingsail: 14 kn

• Cruising Speed for continuous operation - solar only: 4.5 - 5 kn

• Cruising Speed for continuous operation - solar and wing: 6 - 10 kn

• Cruising Speed day time: 8 - 10 kn

• Range Over 24 h: 180+ nm

Note: These values may vary between versions and sea / weather conditions

EQUIPMENT INCLUDED - RACER VERSION

• Integrated power management system

• Solar power & energy storage system

• Electric propulsion system

• By-wire steering system

• Helm stations at cockpit & flybridge

• Galley counters, storage, sink, oven, stove, fridge, freezer

• 4 en suite heads with enclosed shower, toilet, sink & faucet (in each head)

• All cabin furniture (as shown in layouts)

• Aft deck fixed dining table and aft sofa with collapsible back rest (as shown in layouts)

• Fore deck day bed and lateral seats (as shown in layouts)

• Outdoor marine cork decking / indoor saloon natural bamboo decking

• All cushions In/Outdoor upholstered with Sunbrella® fabric

• 6 deck hatches

• 2 x 500 liter (2 x 132 gal) fresh water tanks

• 2 x 100 liter approx. (2 x 26 gal) fresh water tanks + 1 fresh water pump

• 2 x 350+ liter approx. (2 x 92 gal) holding tanks

• Railings, cleats and fore deck trampolines

• Mooring equipment: 33 kg Rocna® stainless steel anchor + 50 m stainless steel chain 10 mm + 150 m nylon rope + e-windlass

• Regulatory navigation equipment including navigation lights & mast

• 2 x chart plotter 16”; 2 x VHF with DSC button

• Regulatory Life Saving Appliances

• Critical spare parts kit

Note: The above equipment is for the Racer version. Cruiser & Explorer versions carry additional equipment

ZEN50 Solar Wingsail Electric Catamaran - Solar Roof Layout

ZEN50 Solar Wingsail Electric Catamaran - Flybridge Layout

ZEN50 Solar Wingsail Electric Catamaran - Main Deck Layout - Asymmetric D (subject to changes)

ZEN50 Solar Wingsail Electric Catamaran - Cabin Layout - Asymmetric D (subject to changes)

ZEN50 Solar Wingsail Electric Catamaran - Cabin Layout - Asymmetric E (subject to changes)

SOLAR & WINGSAIL

OCEAN RACER

Solar & Wingsail, basic configuration ready to sail, navigation, safety, fridge, etc.

EUR 2 400 000

WORLD CRUISER

Solar & Wingsail, well equipped configuration with, among other options, electric tender, AC and water maker

EUR 2 650 000

ARCTIC EXPLORER

Solar & Wingsail ultimate configuration with all available options

EUR 2 850 000

Solar only, ready to sail basic configuration with navigation, safety, fridge, etc.

EUR 1 850 000

CONTINENTAL CRUISER

Solar only, well equipped configuration with, among other options, electric tender, AC and water maker

EUR 2 100 000

TROPICAL EXPLORER

Solar only, ultimate configuration with all available options

EUR 2 300 000

Ready to reserve your ZEN50?

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Introducing the most exciting performance-focused catamaran to hit the sailing world, the Open Waters 40 is an all-electric catamaran that leverages the latest in yacht construction technologies designed to maximize the thrill of sailing yet still provide the creature comforts of a multihull.

Great handling and speed.

The ESC40 is a 40-ft catamaran designed to be two to three times faster than the typical cruising cat – using carbon fibre to reduce weight and provide increased hull strength.

The twin helm stations are covered by a solar cell-covered roof and come with a 59m2 main sail in addition to three headsails: Jib 26 m ² , FRO 65 m ² and Asail 121 m ² .

The hull is rated to handle boat speeds in excess of 20 knots. With curved retractable daggerboards providing better upwind handling and performance at speed.

The retractable rudders, together with the low draft of 2 ft, allow the boat to cruise in shallow waters and to be beached on the bow or stern.

Regenerative Energy

Thanks to the low weight, higher boat speed and the solar/hydro regeneration systems on-board. The boat is a 100% energy self-sufficient.

The twin electric drives and advanced battery technology allows for quiet, fossil fuel-free cruising.

Using 10 kW motors, the close-quarter power and handling is unrivalled. The folding propeller generates electricity while sailing together with the roof-mounted solar cells, recharging the battery while in operation.

The integrated drives, battery and battery management systems are intelligently inter-connected and provide real-time and predictive insights on power consumption, generation and operational range.

The boat comfortably accommodates four adults and two children, and is sure to bring you all modern comforts such as a 400L water reserve shower and an electric stove.

The hull interior boasts 6’4” of head room with the coach offering even more generous space with 6’8” of head room up to 7 at the aft dinette. The wet deck, spacious with 300 ft ² between hulls features the main stateroom.

Each hull features three deck hatches and six portlights for excellent ventilation while the trampoline across the beam is 305 ft ² of play, relaxation and dolphin viewing.

Our unique construction techniques allows us to manufacture the boat in Canada in a quarter of the time compared to traditional boat building.

We can also build and ship your boat in as early as four months, greatly surpassing the industry standard of 12+ months.

From order to build and delivery, our price compares very favourable to other fast cats.

Faster, cheaper delivery

The boat can be packed in a standard 40ft freight container and be shipped safely anywhere in the world at a much lower cost (up to $50,000 savings) and in a fraction of the time.

Boat owners can now also ship their boat one or both ways between North America, the South Pacific, Mediterranean or the Carribean for a one way cruise or an overwintering.

Vacuum Resin Infusion

Vacuum resin infusion is the process at the heart of our technology and is used for all parts.

The vacuum resin process removes all of the air between the fibres of a part prior to the introduction of the resin.

After the process, our parts are meticulously sanded with variable grit — allowing for maximum paint adhesion on surfaces and smooth, stylish edges.

Core Materials

Core materials are introduced into the part to increase stiffness without increasing weight.

The core is a structural-grade foam with a high shear strength characteristic: if the part is of a complex shape, we cut the foam into sections, thermoforming it to the required shape.

We use five different sizes and densities of foam on the boat, optimized for local strength requirements.

We purchase carbon fiber by the roll and over 35 rolls are used in each boat. We have engineered the laminate schedule to be most efficient in the various areas of the boat maximising strength and reducing weight.

Each meant to be the most efficient for their respective areas. The fabrics are stitched, instead of weaved.

Stitched fabrics do not need to bend over or under other fibre and lay flat, making a stronger part.

At Open Waters, it is our mission to make catamaran cruising more exciting and environmentally sustainable. We’ve set out to create a performance cruising catamaran that will be a joy to sail and that will raise the bar in environmental sustainability.

We have developed a unique  design and manufacturing process, selected high performance  materials that enable us to build a boat that uses less materials and is 50% lighter. As a result it is a lot faster and as a result it is able to generate and store the energy needed to propel it electrically for hours and provide enough energy for on board equipment.

We use high performance carbon fibre and a vacuum infusion process to maximize strength and reduce the use of resin and eliminate resin vapour emissions. We use 100% recycled PET foam core wherever possible and we see the opportunity for incremental use of bio-based epoxy and natural fibres in our future.

As we continue to develop our sustainability roadmap for our boats we will perform a full lifecycle analysis to identify other opportunities to minimize our carbon footprint. 

The unique processes and skills we have developed can be applied and licensed to other marine and recreational vehicles businesses.

Simon Angus

Simon Angus P.Eng is a professional mechanical engineer with a background in project management and a passion for sailing.

He spent his university summers travelling around Europe searching for the best combination of wind and waves in addition to teaching both sailing and windsurfing.

After moving to Canada in 2004, Simon bought a Catalina 27 in Kitimat BC and enjoyed sailing in the Douglas channel with his young family. A career move to Alberta paused his sailing career until he found the joys of chartering sailboats in the Caribbean.

After a 20 year career in industrial engineering and project management he decided to make a change and combined his passion and profession to launch Open Waters Design and Manufacturing in 2016.

He designed and manufactured an 18ft canoe and developed a plug and mold and his proprietary vacuum resin infusion process.  After the successful build of the canoe, Simon built a high performance 18ft A class foiling sailing catamaran out of  a Carbon fibre and refined the mold construction and vacuum resin infusion process.

After researching the various build steps, Simon started with CNC shaping of a plug, hand finishing and building the hull molds. He also built the mast, Z foils and the Tee foil rudders. After successful trials in Vancouver BC, Simon then set out on his next ambitious project, to design and build the boat he had dreamt about for years.

A boat that could be shipped anywhere in the world, sail on with his family and returned to Vancouver for summer cruising and would be electrically sustainable.

Simon was introduced to Hal Whitacre in 2019 which started a design relationship that has resulted in the creation of the Open Waters ESC40.

Hal Whitacre

Hal Whitacre, owner of Whitacre yacht design since 1984 and is responsible for some of the fastest and most luxurious boats ever built.

Hal is Open Waters Chief Naval Architect and has worked closely with Simon over the past 2 years to produce the detailed designs that make up the Open Waters ESC 40.

Hal has a distinguished career in Naval Architecture graduating from the University of Michigan with a degree in Naval architecture and Marine Engineering.

Throughout his career he has pushed the boundaries of naval architecture notably designing the Open Class 60 “Imagine”; breaking ground with the largest rig ever put on an Open 60.

Hal also owns and operates Bruce Roberts USA and in that capacity, he has designed over 100 steel and aluminium boat kits in addition to many fiberglass and  wood sail and power boats. Most recently, Hal was the chief Naval Architect for Gunboat Catamarans when they were built in the USA.

Since their move to Europe, Hal has completed 2 gunboat 55’s along with a conversation of a gunboat 55 to a powercat ferry which has recently conducted successful sea trials.

Hal and his wife Tammy split their time between Annapolis, Md and Sister Bay, Wi.  Hal continues to race Lasers during the winter and windsurfs/foilsurfs as much as possible.

We’re hiring!

Join us on our mission to make catamaran cruising more exciting and environmentally sustainable.

Marine Experience Marketeer

You are well versed and have experience in nearly everything digital marketing. You’ve either grown up boating, lived the life of a cruiser, traveler, racer or practice an other lifestyle action sport and know what makes people tick. You’re an avid content creator and storyteller and you can work your magic with the tools of the trade. Lights, camera, sounds, action. 

Join us for a seamless blend of work and play as we test and trial the boat, document BC cruising experiences and host prospective customers from around the world. While a lot of time is spent on the boat you’ll also be responsible for the creation, editing and delivery of all digital content via influencers, communities, social and traditional media and marketing channels. 

If this sounds like you, please email me at [email protected] tell me why you’d love to join us in BC this summer and include a few links to the amazing content you’ve created and shared. I look forward to our chat.

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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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The boat of tomorrow

Imagine an eco-friendly boat that blends into its environment without causing distruption or harm, while also offering a remarkably luxurious and relaxing experience. Fountaine Pajot have designed and built this very boat, transforming this dream into reality.

Fountaine Pajot, pioneers in eco-sailing

With a desire to always remain a pioneer in its field, the Fountaine Pajot Group began thinking about energy transition in the cruising industry in 2011 with the Eco Cruising concept, aiming to integrate as many renewable energy sources as possible on board cruising boats , especially through the use of a hydro-generation system. Since then, with the construction and launch of the first hybrid electric cruising catamaran , the Aura 51 SMART Electric, and the design and construction of the world’s first hydrogen-powered sailing catamaran , the Samana 59 Smart Electric REXH2 prototype, the Fountaine Pajot Group has become a leader in the green yachting industry.

Aura 51 Smart Electric, the new eco-friendly catamaran

Smart Electric, an adaptable system

A viable and effective solution based on the Aura 51 production series, the Smart Electric system, designed by Fountaine Pajot, is designed to be installed on every boat in its catamaran sailboat range. By 2025, 50% of Fountaine Pajot catamarans will be fully electric and 100% will be fitted with solar panels . By 2030, the Group aims to make 100% of its fleet electric and to phase out diesel engines.

Boats for a brighter future

Samana 59 Smart Electric REXH2 – The world’s first hydrogen-powered catamaran

The Samana 59 Smart Electric RexH2 features a revolutionary energy design comprising a REXH2 capable of delivering up to 70 kW of continuous power, a 63 kwh LiFePO4-EVEPOWER (Lithium Iron Phosphate) cell battery and 42 m2 of solar panels capable of delivering up to 6000 Wc. This energy mix means we can take advantage of all the renewable energies onboard the catamaran (solar, wind, and hydrogen). In port, the crew can fill up with hydrogen and recharge its batteries if necessary. All the technologies are managed by the Smart Cruising solution, an automated Power Management System for simple, intuitive control of this cutting-edge technology.

Aura 51 Smart Electric

Pioneering the Smart Electric system, the Aura 51 sets the course we are heading, as we will be integrating the system across the entire Fountaine Pajot range in the near future. The Fountaine Pajot design office, in collaboration with architects Olivier Racoupeau Design, has designed the Aura 51 Smart Electric to accommodate a large surface area of solar panels without affecting her appearance. Her large, user-friendly flybridge is fitted with 15.55 m2 of solar panels fully integrated into the catamaran’s line , capable of delivering 2000 Wc of energy to power two battery banks supplying up to 32 kwh each. An additional option produces 1.5 kw of energy by a hydro-generation system using the propulsion propellers’ reverse rotation when under sail.

The Dufour “Unicorn” Project

The first monohull yacht to be built using recycled, recyclable composite, this Dufour prototype is designed to prove the effectiveness of new, low-impact construction materials. The aim is manifold:

• To raise awareness of the lifecycle of boats and new ways of using them
• To encourage the recycling of materials at the end of a boat’s life
• To design the yachting monohull of the future, both inside and out, to respond to tomorrow’s expectations and lifestyles .

The ultimate aim is to deconstruct this eco-friendly yacht 100% in order to test its entire life cycle .

Discover also

ODSea People

Sailing towards carbon neutrality

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This Sleek 80-Foot Electric Catamaran Uses Solar Power to Cruise With Infinite Range

The zero-emissions multihull sports an innovative solar skin that continuously generates power at sea., rachel cormack.

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Sunreef ’s hotly anticipated electric “Super Cat” is now prowling the high seas. 

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In addition, the 80-footer is fitted with the yard’s signature solar power system. Roughly 2,152 square feet of solar panels have been integrated into the composite exterior and will generate up to 36kWp of clean energy that can be stored in the batteries or used to power the hotel load. 

“The climate impact of large power yachts is significant,” the owner told Sunreef in a recent interview. “We have taken extensive steps to impact the climate crises, therefore we could only consider a power yacht if it would incorporate technologies that are rapidly scaling in other sectors such as solar energy and electric vehicles.”

The green features can be found onboard, too. The cat comes with an energy-saving air-conditioning system, a water-making and purifying system, and smart energy management. The eco materials used throughout were also ethically sourced.

The interior was tailored to the owner and features four generous cabins. The décor pairs elegant contemporary furnishings with a subtle palette of neutrals that complement the gleaming, bronzish-gold hull.

Super Cat, indeed.

Click here to see all the photos of the 80 Sunreef Power Eco .

Rachel Cormack is a digital editor at Robb Report. She cut her teeth writing for HuffPost, Concrete Playground, and several other online publications in Australia, before moving to New York at the…

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The Revolutionary Electric Catamarans Introduce Zero Emission Cruising

With greater awareness about pollution, sustainable and emission reduction practices have become increasingly salient in the maritime industry. The International Maritime Organization envisions a reduction in CO2 emissions by 40 percent by 2030 across international shipping to combat climate change.

The nautical sector has found a promising solution with the invention of electric catamarans. These vessels are powered by electrical energy, offering a more ecological, energy efficient, and environmentally friendly alternative to traditional cruising.

Making The Switch to Electric Catamarans

Electric catamarans are propelled by electric motors that draw power stored in lithium-ion batteries. These massive batteries are replenished by solar panels, wind turbines, hydrogenators, or a combination of all, allowing electric catamarans to ply oceans with an extended range.

Sunreef Yachts Eco remains at the forefront of eco-friendly responsible yachting with their electric sailing and power catamarans . The shipyard has made impressive strides in pursuing green energy generation for sailing the blue waters, including the installation of battery banks of the future and utilization of renewable energies.

What Makes Electric Catamarans Convenient?

1.  questing for unpolluted waters.

Did you know that one litre of oil is capable of polluting one million litres of water ? What is more is that catastrophic oil spills only account for five percent of the total water pollution, the rest of the major chunk is avowed against engine emissions, oil leaks, and refueling from waterborne vessels. This oil contains hydrocarbons and heavy metals that damage the aquatic environment and adversely affects human health.

To avoid contamination, eco-conscious yacht builders and manufacturers, like Sunreef Yachts Eco, have launched electric catamarans that are less likely to harm wildlife or water users. With electric catamarans, there are no risks associated with spilling fuel as they need not make their way to an oil pump for replenishing.

Apart from rising concerns of water pollution, the traditional marine outboard engines are also known to have detrimental effects on marine wildlife due to the noises generated. This noise impacts breeding cycles, hinders navigation of partially sighted animals, and prevents fishes from hearing their predators. As counterparts, electric engines boast quieter operations, thus minimizing adverse effects on wildlife and making the voyages more pleasurable for yachting enthusiasts.

2.  Greater Environmental Sustainability

An electric catamaran’s engine contributes significantly to a reduced carbon footprint that combats climate change effectively without releasing exorbitant levels of toxic pollutants, such as carbon monoxide, hydrocarbons, and nitrogen oxides, which deteriorate air quality.

3.  Energy Efficiency

Electric propulsion systems tend to be more energy efficient than the traditional internal combustion engines. This is because the extraction of fossil fuels from deep within the Earth, refinement, transportation via great distances, and distribution to oil pumps, accounts for a staggeringly high consumption of energy.

Additionally, the overall energy efficiency of a diesel engine is often capped at 40 percent; the rest of the 60 percent is lost in the name of heat and friction. On the other hand, electric catamarans can be charged directly from the grid, providing renewable electricity, to be more environmentally friendly. This accounts for lower operating costs overall.

Sunreef Yachts Eco employs the latest in yacht building technology to ensure efficient power distribution and hull form. The lightweight hull of our electric catamarans guarantees instant power with little to no drag, resulting in least possible wasted energy.

4.  Lower Maintenance Cost

Electric catamarans require relatively lesser maintenance as they boast fewer moving parts that use low friction magnetic field for operations and experience close to zero vibrations compared to internal combustion engines. They eliminate the need for winterization maintenance, oil changes, and filter, gaskets, or impeller replacements.

Alongside this, replacing greenhouse gas emitters, such as petrol and diesel, is certainly more economical. This also accounts for electric catamarans having a greater resale value on the market.

Understanding The Role of Marine Batteries 

The primary reason why consumers avoided plowing waters with electric catamarans back in the day was the limited range that made variable sea states hazardous. What made the situation worse was their slow charging abilities at limited marinas around the world.

However, the electric catamarans of today offer smooth and silent operations, excellent maneuverability, and emission-free functioning. Additionally, they have torque from the second their shaft is engaged, enabling them to accelerate faster than conventional internal combustion engines.

Sunreef Yachts Eco envisions a more carbon neutral future for its catamarans. But apart from reducing emissions, the shipyard is also determined to find ways to significantly improve performance, range, and comfort onboard.

The Batteries on Sunreef’s Electric Catamarans

Sunreef Yachts Eco fully electric catamarans are equipped with custom engineered marine battery banks that offer prolonged battery life and more power despite compact size and optimized weight. With a density below 5.2kgs per kWh, these lithium-ion battery packs are recognized as 30 percent lighter than standard battery systems used worldwide. The reduced weight of the battery accounts for lesser drag, which translates to reduced energy being consumed by propulsion.

Additionally, the battery size is also smaller, leaving more room in the hulls to expand on living space. The ability to charge the batteries of this electric catamaran in harbors across the world, regardless of the voltage, adds a unique level of versatility and convenience for cruising.

It is important to note that Sunreef Yachts Eco equips each model within its range with custom marine lithium battery banks, scaling between 400 to 700V with pack sizes extending up to 1MW. Their capacity allows for nearly two days of air conditioning and house appliances use. These are fast charging, long-lasting batteries with a lifespan of up to 10 years; but even after years of service, 80 percent of the original capacity is maintained.

The Utilization of Renewable Energy on Yachts

Energy regeneration onboard an electric catamaran allows them to have an unlimited range without relying on external fuel sources, making them fully self-sustaining. Installing a clean green energy production to the catamaran’s existing battery pack makes it far easier to run the essential electric components onboard.

Renewable energy produces no GHG (greenhouse gas) emissions despite powering the world’s growing fleet of electric catamarans. To protect the oceans, here are the three major renewable energy types that can be harnessed onboard an electric catamaran:

1.  Solar Power 

The utilization of solar energy on electric catamarans has proven to be a significant step in decreasing the consumption of environmentally damaging fossil fuels such as gasoline. Sunreef Yachts Eco has successfully produced its in-house engineered, patent pending technology, solar panels that can be fully integrated into the composite bodywork of the electric catamaran. The energy produced is stored in lithium-ion batteries.

These are the industry’s lightest solar panels, that can be mounted on the superstructure, hull, or mast, for maximum power generation. In general, multihulls offer a more stable platform for accommodating a large solar array in comparison to monohulls.

2.  Marine Wind Turbines

Marine wind turbines (also known as wind generators or wind chargers) are mounted atop catamarans to maximize the conversion of kinetic energy of air in motion to electricity. This in turn keeps the battery banks charged in the absence of solar power; hence playing a vital role in the energy mix of electric catamarans.

It is generally a stable source of power throughout the day, regardless of whether the vessel is docked or under navigation. That being the case, the more wind pressure the catamaran encounters, the more power the turbines produce. Overall, wind turbines significantly reduce operational costs by minimizing fuel consumption.

3.  Hydro Generation 

Hydro generation allows you to create power whilst sailing in an electric catamaran. Simply put, harvesting the momentum of waves converts kinetic energy into electrical energy, which can later be fed into batteries to supply electricity to the ship.

Sunreef Yachts Eco redesigned their sailing catamarans to draw power from the energy of waves rather than fossil fuels. Because regeneration can even come from the free spinning of propellers when the boat is under sail, it proves to be a viable method for procuring clean, green energy. Additionally, it has proven to be highly efficient on electric catamarans produced by the shipyard as the electric power can be recovered from two engines.

How Innovative is Sunreef Yachts Eco?

During recent years, the Polish shipyard , Sunreef Yachts Eco has grown increasingly aware of the urgency of protecting the environment. Our research and development team has launched ground-breaking inventions in the yachting industry with greener tech, efficient design, and cleaner manufacturing processes.

Air Conditioning

For starters, electric catamarans from Sunreef Yachts Eco are the only ones to boast an energy-saving, gas-based air conditioning system, providing notable energy efficiency for a sustainable yachting experience.

This system consumes 70 percent less energy than the standard air conditioning system. Not only is it capable of running on batteries throughout the night to guarantee a peaceful sleep onboard, but also provides top-notch humidity control in tropical regions.

Smart Water Management

Because freshwater generation is crucial for sustainable cruising, Sunreef Yachts Eco installs advanced water purification systems and highly efficient watermakers onboard electric catamarans. This guarantees unlimited access to clean water which reduces the need for plastic bottles onboard.

Another ongoing project by the research and development team at Sunreef Yachts Eco is the Zero Cat , a 90 feet catamaran with unique clean, green power generation capabilities.  This superyacht ’s fuel cell system will convert methanol to hydrogen onboard for zero-emissions cruising.

Sunreef Yachts Eco also aims to be the first shipyard to incorporate hydrogen on its electric catamarans as a substitute to conventional energy. Combining hydrogen power with electric propulsion would enable the 80 feet sailing catamaran to achieve unrivalled autonomy for eco-conscious cruising as it powers both onboard appliances and engines.

Future Plans

The idea encapsulated here is to continue making sailing more accessible for people around the world, but with minimal impact on seas and oceans. Sunreef Yachts Eco aims to commission 40 electric catamarans in 2024 that embrace latest propulsion technologies such as electric motors, advanced lithium-ion battery chemistries, and regeneration capabilities that rely heavily on renewable sources of energy to help protect the planet.

Frequently Asked Questions

Who makes electric catamarans.

Sunreef Yachts Eco is the world’s leading designer and manufacturer of electric catamarans, including both sailing and power multihulls. The shipyard is largely known for its production of bespoke luxury catamarans, stretching between 30 to 164 feet.

What is the range of the electric catamaran?

Sunreef Yachts Eco electric catamarans boast an unlimited range under favorable and sunny weather conditions. They are easily maneuvered, seaworthy vessels, with impeccable buoyancy even in rough seas. Featuring a mix of eco-energies, our electric catamarans also prove to be self-sustaining for extended periods of time.

Are there any electric powered catamarans?

In recent years, Sunreef Yachts Eco has launched several electric catamarans, powered by renewable energies for minimum ecological footprint. Furthermore, the shipyard has committed to 40 additional electric catamarans which will be launched in 2024, which includes multihulls from the newest range, the Sunreef ULTIMA .

EXPLORE OUR ELECTRIC CATAMARANS

Ultima range, previous post sunreef yachts and rosberg x racing renewed partnership, next post recharge at sea: solar catamarans harness sun-powered serenity.

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Sunreef Venture S.A.

Sunreef Yachts Shipyard

ul. Tarcice 6

80-718 Gdańsk, Poland

+48 58 769 77 77

50' 2022 Nova Luxe Elite 50 Hybrid

Nova Luxe, the leader in power catamaran electric re-fits, brings you ELITE 50 (IE) model as an electric hybrid new build. IE or Inboard Electric is founded on an industry proven power design. This is our Blue Water hybrid model which places a traditional Diesel Motor in the port hull and an electric motor in the starboard hull. No generator is necessary for this configuration and its top speed is comparable to a full diesel version. Unlike a full diesel, this yacht can cruise silently as electric all day. We optimize the props for different speed ranges making this the most efficient and highest performing electric hybrid of its class. 

The two propulsion systems can function independently. A redundancy level necessary for blue water. The alternator of our diesel engine is upgraded by Integrel Solutions to allow for 15kW of power (1kw is normal alternator output) to flow through and charge the batteries whenever it is running. At rest, the solar array is large enough to cover the entire house load and send excess power to the high voltage batteries for propulsion.

The 10kW solar array provides ample power to run the house load for a 24 hour period. Freedom from a generator while at anchor. In practical use, you could spend several days at an island, then use the power you stored to travel an additional 10-40 miles to the next island. Leave the diesel in the tank and travel on green energy. 

With the Torqeedo electric propulsions system the yacht has a two year warranty on all electric systems as well as, battery capacity warrantied for 8 years.

The world today is different and will continue to change. To see natural beauty you need to travel off the beaten path. When you find the oasis you have been searching for, cruise in silently, observe the wildlife and leave without a footprint of diesel, oil, or CO2.

The ocean and its? reefs all around the world are under stress. This underwater world is a true wonder. Now is the time to see it and we have the ability to do so without polluting. With your help we can transition to a cleaner planet. 

Highlights:

10kW Solar Array

Electric Hybrid with greater range than diesel!

Top speed comparable to diesel

Fully Autonomous

Owners Version / Charter Version available!

Watermaker and rain capture system

Washer/Dryer

• C-Zone electronic multifunction display for monitoring and controlling all electrical systems onboard 

10" B&E, Torqeedo display and management system

Option to upgrade from 55kW Torqeedo electric engine to 100kW electric engine for greater speeds

Call today!

External Resources

Nova luxe home page, specifications, basic information, dimensions & weight, tank capacities, accommodations, vessel details, vessel overview.

• Woodwork using certified Teak, White Oak or Asian Mahogany 
• Saloon with teak/oak flooring 
• Marine vinyl ceilings and skirting 
• Choice of upholstery with Quick dry foam cushions & bed mattress throughout the yacht 
• Personalized hull color
• Proper outdoor shower
• Fresh water rain catcher

Helm & Navigation

• Full engine instrumentation 
• Complete power assisted hydraulic steering system and complete electronic engine controls 
• Heading compass 
• Navigation lights control 
• Large storage compartment under helm with ease of access to console instruments
• Area: 22.00 m (236 ft ) 
• Access via straight staircase from Cockpit 
• Pilot seat for 2 persons 
• Forward facing sofa seat for 2 persons 
• Large U-Shaped rear sofa for 8 people with 2 handcrafted teak tables 
• Large under seat waterproof stowage 
• 316 Stainless steel handrail 
• 316 Stainless steel framed inversed windshield with Acrylic windows to deflect wind and reflections 
• Flagpole for two flags 
• Radar arch with mast and 10kW Solar Array roof 
• LED Navigation Lights (Port, Starboard, Stern, Anchor and Running) 
• LED main lighting 
• Fully covered fiberglass hardtop 
• Storage under seating area for safety equipment 
• Various glass holders
• Stainless Steel sink with pull-out mixer tap 
• Storage cupboards and drawers 
• Concealed waste bin 
• Two plate ceramic stove 
• Corian Solid Surface counter top, with draining grooves 
• LED ceiling lighting 
• Ice Maker and Refrigerator
• Area: 26.00m (279 ft ) 
• 2 x Solid teak transom swim deck & ladder 
• Stainless Steel staircase with teak steps to fly bridge 
• 6 seat sofa with backrest and under-seat stowage 
• Handcrafted teak cockpit table 
• Hella Marine LED exterior lighting 
• 60 Amp shore power connection with cable 
• Work counter with storage locker 
• Easy lifting deck hatches to engine compartments (port & starboard) with gas struts 
• Access to wide side decks 
• Transom shower with water mixer tap 
• Transom Swim Platform for easy & safe boarding, and swim shower area 
• Foldable Stainless Steel swim ladder 
• Self-Draining Cockpit

Fore deck & Side decks

• Lounge seating at bow for 8 with drinks table & glass holders 
• Main locker for access to anchor gear 
• Vertical windlass, bow roller and Delta anchor (Below deck for safe un-obstructed walkway) 
• Forepeak storage compartments, with easy opening gas struts 
• 316 Stainless Steel handrail, body height for maximum safety and child safe 
• Watertight opening deck hatches for natural light and ventilation 
• 6 x 12” Mooring Cleats
• Area: 17.00m (182 ft ) 
• Teak/Oak flooring 
• Sofa seating for 8 people 
• Handcrafted teak wood dining table for 6 people 
• Vinyl ceiling with LED down lighting 
• Large 316 Stainless Steel sliding door with tempered glass for access to cockpit 
• 180 degree panoramic view with tempered glass safety windows 
• Stairs leading to master cabin and guest cabins 
• Faux Leather ceiling and wall coverings

Aft Cabin (Port & Starboard)

• Large double bed (1.55m x 2.00m) with cushions 
• Large Ocean view window 
• Storage space under bed 
• Hanging locker with shelves 
• Deck hatch for natural light & ventilation 
• LED Ceiling lighting 
• LED Ambiance lighting 
• Reading lamps 
• Teak/oak flooring 
• Soft Faux Leather wall and ceiling covering 
• 120V OR 220V power outlets

Forward Cabins (Port & Starboard)

• Large Double bed (V-berth) 
• LED Ambience lighting 
• Teak/Oak flooring
• Deluxe electric marine toilet with an integrated macerator system 
• Private door leading to cabin 
• Corian Solid surface counter top with sink 
• Washing basin with single lever mixer tap 
• Separate enclosed shower 
• Mirror, Shampoo and sundries shelf 
• Under counter stowage 
• Tissue holder & towel rail 
• Opening Port light for natural light & ventilation 
• Complete Black and Grey water systems 
• LED down lighting

Engine Compartment & Equipment

• 1 x 300 hp (200kW) diesel engines with reversible V-drive gearboxes for comfort and ease of maintenance (Volvo D3 300hp or Steyr 292 hp (SE306J38))
• 1 x 150 hp (100kW) Torqeedo electric motor
• 10kW Torqeedo Solar Charger
• AC system and blowers from Thermodynamics
• 6 x 3kW USA / Europe compatible shore chargers
• Electronic engine control & instrumentation panels 
• 1 x 48V, 15kW alternator
• Exhaust/Water mixing elbow with marine muffler for noise reduction 
• Automatic fire suppression system, heat-activated with engine shutdown, helm station alarms and manual release. 
• Manual engine fuel shutoff valve from main deck level 
• Hydraulic steering cylinders 
• Cathodic protection 
• Dripless Shaft Seals 
• Forced engine room ventilation with louvered air vents 
• Engine room heat and sound insulation, flame retardant 
• LED engine room lighting 
• Large engine compartment for ease of access and maintenance 
• Shut-off valves for all underwater intakes & outlets 
• Keel with shoe for protecting propellers and rudder from nets, ropes and sea bottom. 
• Raw water strainers, with clear lids for easy inspection 
• Total of 6 Automatic bilge pumps with manual override and integrated with CZone system for monitoring and control
• Spectrum Water Maker

Fuel System

• 2 x 125 US gallon Custom made Stainless Steel fuel tanks 
• Stainless steel deck fuel fillers and breathers 
• Fuel/water separator filters for added safety and ease of maintenance 
• Remote fuel shut-offs from outside engine room 
• Fuel tank monitoring with C-Zone 
• Fuel transfer between tanks
• 2x 40kW BMW high voltage batteries
• 10kW solar array

Construction

• Multiaxial FRP Construction using Bisphenol A-type Epoxy Vinyl Ester resin for excellent resistance to corrosion, organic/inorganic acids, alkalis, oxidizing chemicals and salt solutions, by vacuum infusion method 
• Isophthalic gelcoat for high color stability and osmosis resistance 
• Vacuum infused core sandwich and bulkheads
• Watertight collision bulkheads in forepeak for added safety 
• Watertight engine room compartments 
• High Quality Tempered Glass front windows 
• Marine Grade 316L Stainless Steel handrails, deck fittings and hardware

Electrical System

• 24V DC, 230 V AC through inverter OR 120 V for USA
• 10kWh of 24 V lithium Ion Batteries (Torqeedo)
• 2 x 800 Cold Crank Amp engine starting batteries 
• C-Zone digital control system (NMEA 2000) 
• 2 x 60 A Shore power connection with cable 
• 24 V, 15kW Inverter/Charger
• Bi-Direction House to High Voltage inverter
• 10” B&E, Torqeedo display and management system

Fire Fighting & Safety

• Automatic engine compartment fire suppression system with engine shutdown, helm station alarms and manual release 
• Manual fire extinguishers 
• Fireproof high voltage battery compartment
• Collision bulkheads in bow, and watertight engine compartments 
• 40kg (77 lbs.) MAxset anchor with 50m chain

Additional Items Included

• Owner’s manual supplied 
• Engine and equipment manuals 
• Sailaway Package 
• Ship’s document case

The company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. This vessel is offered subject to prior sale, price change or withdrawal without notice.

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Presented By: Shane Faunce    727.647.5557

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GREEN PROPULSION FOR ELECTRIC CATAMARANS

Electric engines.

Enter a world of vibration and fume-free navigation. Sunreef Yachts’ eco-friendly electric catamarans feature advanced electric engines offering the best of autonomy and performance for a responsible yachting experience. Thanks to innovative green propulsion solutions, the shipyard’s eco-friendly catamarans combine fuel savings, low-maintenance, and ultra-silent operation.

Electric propulsion not only is the green choice for conscious yachting but also brings more freedom, peace of mind and luxury on board.

Hybrid Engines

Sunreef Yachts electric catamarans have the option to be equipped with ultramodern hybrid propulsion systems as well. Besides significantly reduced CO2 emissions, hybrid engines take eco cruising to the next level by combining the best of electric motoring with the advantages of thermal engines. Hybrid engines not only offer reliable propulsion but can also be used to recharge the yacht’s battery bank for even more energy-efficiency.

Eco-friendly hybrid catamarans by Sunreef Yachts are a guarantee of solid performance, low-maintenance, and Atlantic-range.

Relying on wind as an essential source of propulsion is the most natural way to think about yachting. Sunreef Yachts’ sailing range of electric catamarans offer top quality rigging and fully recyclable performance sails. Wind can also be a precious support when it comes to motor yacht propulsion. The shipyard’s range of power eco-friendly yachts can be fitted with high-performance kites to combine the advantages of eco motoring with wind propulsion. Frequently used for towing large container ships, kites are an extremely powerful support for leisure crafts.

Sunreef Yachts’ motor yachts equipped with kites enjoy oceanic range, massive fuel savings, more visibility and safety.

Green Concept

Renewable energy on yachts, energy efficiency on yachts, sustainable finishing materials, see our range.

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Sunreef Venture S.A.

Sunreef Yachts Shipyard

ul. Tarcice 6

80-718 Gdańsk, Poland

+48 58 769 77 77

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• Marine Electric Engines: How They Work

By François Meyer | January 2024

Last season’s boat shows allowed us to visit and test several electric and hybrid-electric catamarans. It is now a reality: catamarans no longer necessarily have diesel auxiliary propulsion but can be equipped with electric motors.

But how do they work and how do we compare their performance to more traditional power units? Electric, hybrid, power, voltage, charging, autonomy: there are many questions that arise from these configurations.

The aim of this article is to explain the various technologies and see things more clearly. For example, we will take a look at Electric Engines vs Diesel Engines and compare serial and parallel hybrid power systems.

Definitions

Range and Power Density Range and autonomy play a key role within cruising catamaran capabilities. Diesel delivers a huge range because of the high power density of this fuel.

For diesel, one 20 litre jerrycan of diesel (25 kg including the can) contains 204 kWh energy, which is very substantial compared to a battery bank. If you wanted to store 204 kWh energy in a battery bank, it would weigh more than 1200 kg.

The high power density of fossil fuels is one of the main reasons for the dependence of the industrialised world on this fuel. Conserving power within batteries costs a lot of weight and money and requires powerful inboard charging.

Diesel Engines

Because of the high power density of fossil fuels used in combustion engines, the efficiency of diesel ones, was not such an important consideration, especially in boating.

The average overall efficiency of a diesel engine rarely goes beyond 40%. It means you “lose” around 60 % of fuel within the process. Lots of internal mobile parts generate friction and heat which is the main loss.

Furthermore, most catamarans use saildrives. This transmission choice, saves space inside the hulls, but comes with around 10% more losses (gears) compared to a shaft drive.

So at the very end of the day, from an energy point of view, a catamaran fitted with diesel saildrives is not very efficient.

Efficiency of Diesel Engines

Electric Engines

On the other hand, there are not as many moving parts in an electric engine that uses a low friction magnetic field to operate. Their overall efficiency is much higher, higher than 90% in the case of the Permanent Magnet electric motors used in marine vessels.

Better efficiency means also avoiding waste! For that reason, most newbuild catamarans are choosing shaft drives, not saildrives, to achieve better overall efficiency. Electric saildrives, like Oceanvolt Servoprop, are mainly designed for saildrive designed boats whose bilges are simply too small to receive a shaft.

Efficiency of Electric Engines

Downsizing : Diesel and Electric Power Engine Comparison

You may have already noticed this, but electric catamarans are commonly fitted with engines whose power rates well below diesel ones. Firstly there is the conversion factor between horsepower and kilowatt. This is just maths, as 1 kilowatt (kW) is equivalent to 1,36 HP.

The big difference is in torque availability. A diesel engine has its nominal power and torque (the ones that are advertised) at high RPM, at a much higher speed than an engine should be used.

On the graph below, we see power and torque of both diesel and electric engines. For a traditional setup, the power is represented by the dark purple curve at high RPM of a diesel engine (max at 3200 RPM).

If we look at the light purple curve (electric engine), this shows the power of an electric motor is almost constant, after starting.

Let’s now have a look at the torque curves. Torque is the force which turns the propeller and propels the boat.

At 1800 RPM, both motors benefit from 100% of their torque. To achieve 150 Nm of torque, the electric motor needs only 20 kW while the diesel requires 42 kW!

The combination of high torque-low RPM and better overall efficiency mean that you can downsize electric engines when compared to diesel ones. The downsizing sits between a factor of two and three.

System Tension

One of the basic rules of electricity involves the relationship between power, voltage and current.

Power (W) = Voltage (V) x Current (A). The higher the voltage is, the lower the current. Lower amps means, on a boat, smaller diameter cables. But higher voltage also means lethal danger.

There is a physiological limit for a human being (above 120V DC): the heart can be stopped by electrical shock. In wet conditions, this limit goes to 60V DC. That is why most hybrid catamarans are wired at 48V, well below 60.

Some boatbuilders, like Fountaine-Pajot with the Smart Electric Series (Aura 51, Elba 45…) use a 400V DC setup. It is a boatyard choice, but only very educated and skilled tradesman will work on such systems when any marine electrician will be happy to work the more common 48V system.

Electric, or hybrid?

Electric catamaran An electric catamaran is a vessel whose principal propulsion is provided by the wind and whose auxiliary propulsion is provided by an electric motor. On board a 100% electric catamaran there is no combustion engine and no other energy than electricity.

There are not many 100% electric catamarans around as their range, dependent on battery capacity and onboard chargers, is too low for cruising.

The story of Jimmy Cornell’s Outremer 4.Zero is interesting as the renowned sailor decided to go, against the will of the yard, with a full electric (ie. not carrying a diesel genset). In the end, power consumption and power production were not in balance and the fossil free circumnavigation project failed. Relying only on a small sized solar panel array (1,3 kWh) and relatively inefficient regeneration, the boat’s energy consumption was simply too high.

On that boat, fitted with 2 x 10 kW Oceanvolt Servoprop saildrives and 17,5 kWh of batteries, the range, motoring, at mid RPM is less than two hours. Regeneration was delivering around 300 Wh, (0.3 kWh), too few to refill the batteries while using all of the electric appliances.

Hybrid Catamarans A hybrid catamaran is a vessel whose principal propulsion is provided by the wind and whose auxiliary propulsion is provided by different means including an electric engine. Its system uses two or more power sources on board.

Hybrid catamarans can be equipped with an auxiliary main diesel propulsion, assisted by a secondary electric one (parallel hybrid or bi-motorization), or with auxiliary electric engines relying on batteries that can be recharged under way by a generator (diesel, hydrogen, methanol), ie a serial hybrid. This greatly increases the range.

Because of the requirement for a good range, most of the so-called electric catamarans like the Windelo 50, HH44, Fountaine-Pajot Smart Electric Series, O-Yachts Class 66 Eco are hybrid catamarans.

Serial Hybrid Catamarans

A serial hybrid catamaran is propelled by two electric motors. Those motors get their power from batteries which are being charged while sailing using various means.

Solar (photovoltaic) panels account for an important share of renewable energy in the energy mix. Hydrogeneration does not depend on light and can deliver power at night, when sailing a passage.

Serial hybrid catamarans always have a back-up power generator to fill the batteries when needed. The generator can be diesel, or in the future hydrogen, ammonia or methanol (fuel cells).

The Windelo 50 is probably the most efficient serial hybrid sailing catamaran on the market.

Light and fast, she sails well and her two 20 kW electric engines with shaft drive deliver the best efficiency possible. Wired in 48 VDC, with 53,8 kWh of battery capacity (propulsion, 6 kWh house bank), the boat boasts a 5,5 kWc photovoltaic array.

Under sail, on a passage, the boat produces enough power to cover its consumption and slowly charges its batteries. Solar gives her between 20 to 30 kWh per day (depending on latitude) and hydro regeneration, around 24 kWh per day when sailing 10 knots.

But, if needed, the generator can be started, delivering 17 kWh to the battery bank to replenish it within hours. Or, if they are empty, to provide 6 knots motoring speed, the genset is used.

Combining those three methods of charging, the yard claims a 1100 NM range, which is twice the range of a Lagoon 42 with its two 57 HP diesels.

Nevertheless, the Lagoon 42 still has the advantage of power as it can increase its RPM when motoring against waves and tide to cruise at 7 knots while burning more fuel. The Windelo cannot do that, and, in such conditions, its motoring speed will lower.

The Lagoon retains a second advantage as if one diesel fails, the boat still has the other to motorsail.

If Windelo loses its genset at night with depleted batteries, she will have to rely on her sails. Some owners choose a 2 genset configuration for redundancy, but that does add weight and cost.

Parallel Hybrid Catamarans

This set-up uses an electric motor mounted on the diesel engine, both capable of moving the propeller. Where the serial hybrid has two functions (moving and regen), the parallel has four.

The diesel engine can propel the boat. While doing that, it can also move the electric engines which will produce some power, acting as a generator.

The electric engine can move the propeller, diesel off. And, in emergency cases, both electric and diesel engines can move the prop, in a kind of boost mode.

The parallel hybrid yachts do not need any generators as their engines behave as powerful ones. This setup fits particularly well for cruising catamarans as you can enjoy the joy of silent sailing or electric motorsailing but you can always rely on your trusty diesels if needed.

The two systems do not rely on each other and offer an interesting case of redundancy.

A catamaran like the HH44, charges 5,4 kWc from solar and has two 30 HP diesel + 2 10 kW electric motors using a 43,2 kWh battery bank. While diesel motoring, the boat delivers 10 kW to charge the batteries. A sunny day can also fully charge the bank.

Those 43,2 kWh can propel the yacht at 6 knots for a couple of hours. Total range (diesel) is around 628 NM, according to the yard, a range which comes with a good dose of redundancy.

Bi-motorised hybrid catamaran

This third hybrid mixes 2 independent propulsion systems, a diesel one and an electric one.

O-Yachts offers, in its Class 66 Eco, a bi-motorised setup for example. One hull has a conventional diesel with shaft and the other an electric engine with a shaft-drive.

As the two systems are totally separated, the redundancy is there. The boat can be sailed with one engine, diesel or electric, and a small 5° rudder correction will drive the boat straight. Diesel alternator, regeneration and solar replenish the batteries.

This setup, although interesting, suffers from a disadvantage. As the two engines are different, they behave differently and this can cause issues manoeuvring in the marina. The skipper will need plenty of experience in different conditions before fully mastering the boat.

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Algae may not seem like the sort of thing that would inspire a superyacht, but Rossinavi has credited the aquatic plant with doing exactly that.

The Italian yard has just unveiled its first electric catamaran concept, known as Sea Cat 40, which it says takes cues from phytoplankton. This specific type of marine algae lives in the upper layers of the ocean and converts sunlight into energy for survival. In a similar fashion, Rossinavi’s 131-foot multihull is fitted with nearly 1,500 square feet of advanced solar panels that capture and store energy from the sun’s rays to power the vessel.

The panels are capable of producing 250 kWh, which Rossinavi says is on par with the daily electricity consumption of six average American homes. Designed for transatlantic crossings, the Sea Cat will be able to chug along continuously for 20 days and cover up to 3,850 nautical miles when cruising at 8 knots, according to the yard.

Sea Cat 40’s solar panels can generate 250 kWh of clean, green energy. Rossinavi

The cat is also equipped with a centralized AI control system to help preserve the battery’s power. It can be programmed to navigate 80 percent in full-electric mode, using only 20 percent of its diesel-electric support, for example.

To be sure, the Sea Cat looks good, too. Italian naval architect Fulvio De Simoni spearheaded both the exterior and interior of the 131-footer, which the yard describes as “modern and elegant.” Featuring an aluminum hull, she sports sinuous lines and a simple silhouette. Onboard, meanwhile, there are plenty of open spaces for entertaining, as well as five cabins for guests and four for crew.

“Supported by the most advanced technologies, Sea Cat 40 is able to offer excellent performance while prioritizing the environment, a real challenge for the future of boating and a milestone for the shipyard” Rossinavi’s COO Federico Rossi said in a statement.

Indeed, this is the first time in 41 years that the Viareggio-based yard has ventured beyond its usual custom superyachts and into the world of high-design catamarans. Further proof that the era of the multihulled motor yacht has arrived.

Check out more photos below:

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The Astréa 42 smart electric, a new model completes the range

22 September 2023

Committing to a sustainable boating industry

The  energetic transition  and the protection of our environment are both major concerns in the  marine industry  nowadays, and are also central considerations for pleasure boat owners. This also reflects the fact that legislation is moving ever more rapidly in this direction, and will affect the choices made by manufacturers in the coming decades. In 2022, with the launch of the  Aura 51   Smart Electric ® – one of the initiators of  decarbonisation  in the yachting industry – the Fountaine Pajot group announced its ambition to promote this type of technology for sailing while respecting the  environment .

With this aim, Fountaine Pajot continued along the same path, unveiling the  Astréa 42   Smart Electric ®, which will be presented for the very first time at the  2023 Grand Pavois boat show . Fountaine Pajot wants to extend the Smart Electric® solution to the entire Sailing Catamarans range, which represents a crucial step in its objective of offering a  100% electric  fleet by 2030 and accompanying each owner towards  eco-sailing .

Take a quick video tour of this innovative catamaran to see the key features that differentiate a traditional catamaran from one equipped with the Smart Electric solution:

The Smart Electric solution extends to the range 

Fountaine Pajot group intends to extend this solution to the entire Sailing Catamarans range by 2024. The  Astréa 42  and  Elba 45  will be the first two models to benefit from this innovative system, after the  Aura 51  in 2022. Fountaine Pajot wants to continue to develop its corporate vision thanks to this technology and this new way of approaching the yachting industry. Smart Electric technology is non-invasive and allows owners to use the natural elements  to generate their own energy on board .

All the  catamarans  continue to benefit from the support of a thermal generator, should the need arise, when there is a lack of sun or wind, for example. The  electric catamarans  offered by Fountaine Pajot provide owners with a more responsible alternative that respects the oceans while guaranteeing optimum performance. Thanks to research and innovation,  electric power  will make it possible to considerably limit our impact on the environment, and is now responding to a growing demand from owners for boats desgined to  preserve the oceans .

A World Premiere at the Grand Pavois in La Rochelle

The  Astréa 42   Smart Electric ® will be presented for the first time at the  2023 Grand Pavois boat show  in La Rochelle, and will only be accessible for private visits. A stand will be dedicated to eco-environmental questions and will highlight all the solutions and commitments involving Fountaine Pajot. It’s the perfect location, between land and sea, in the heart of the largest  aflot boat show on the Atlantic coast, to unveil this cruising catamaran combining  eco-navigation  and  performance .

Fountaine Pajot’s commitment is not limited

To mobility options.

The shipyard is deversifying its strategy, focusing on 4 axes :

1- The first involves the propulsion system, targeting a 100% replacement of conventional internal combustion engines by electric engines by 2030.

2- The second focus is on on-board devices, with the use of extensive solar panels.

3- The third focus is on autonomy in terms of on-board freshwater production, using on-board watermakers coupled with a lowcarbon electrical system.

4- The fourth area is focused on the eco-design of the boats. To achieve this, Fountaine Pajot is working in depth on the recyclability of the composite materials that make up most of the structural parts of its catamarans.

> Fountaine Pajot is also committed to the protection of marine ecosystems, and more specifically the safeguarding of posidonia through its involvment with  WWF France .

By investing fully in these innovative technologies,  Fountaine Pajot seek to considerably limit its impact on the environment, preserve the seabed and managing the life cycle of the boats, while meeting the essential needs of boat owners. The firm’s objective for the coming years is to become the pioneer of  environmental transition in the marine industry , in direct line with its  Odysséa 2024  strategic plan.

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The Power Catamaran Compilation

• By Yachting Staff
• Updated: December 21, 2018

Power Catamarans have been growing leaps and bounds in popularity, and, in lengths and widths. And for good reason. These cruise-centric yachts offer homelike livability for avid travelers, are fuel efficient and are fairly intuitive to run. Power cats are popular in the bareboat charter market too, for these very reasons.

Here, we take a look at 12 catamarans ranging from a cruising-couple-size 36-footer to a 78-footer for friends, family and some more friends. And there are myriad power options: outboards, diesel inboards, hybrid or even all-solar power.

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.

Read more: Fountaine Pajot MY44

Silent-Yachts 55

The ideas about which solar panels, electric motors, inverters and the like to use — and more importantly, Michael Köhler says, how to configure them — became the basis for the brand Silent-Yachts. The company offers 55-, 64- and 79-foot catamarans that run on solar-electric propulsion. The Silent 55 premiered this fall, and the 64 is sold out for the next two years, Köhler says.

Read more: Silent 55

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.

Read more: Horizon PC74

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.

Read more: Aquila 36

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.

Read more: Lagoon Seventy 8 Powercat

Horizon PC60

To understand the Horizon PC60 power catamaran , you need to put aside preconceived notions about midsize yacht amenities. For example, main-deck master suites are the province of yachts over 100 feet length overall. Incorrect. This 60-footer has an elegant and spacious owner’s stateroom on the same level as the salon. If you want a 14-foot center console tender on a 60-foot yacht, you have to tow it. Wrong again. On the PC60, you hoist it onto the upper deck, no problem.

Read more: Horizon PC60

40 Open Sunreef Power

Sunreef is known for pushing the boundaries of catamaran design, incorporating four adjustable hydrofoils into a twin-hulled speedboat.

The Polish builder is one of several European builders (including Evo, Fjord, Wider and Wally) transforming the open ­day-boat category with creative designs. ­Beyond its hydrofoils, the 40 Open Sunreef Power ‘s cockpit has side “wings” along the aft gunwales that fold out at anchor, widening the beam from 17 feet to 22 feet 9 inches.

Read more: 40 Open Sunreef Power

Sunreef 50 Amber Limited Edition

Sunreef Yachts introduced its 50 Amber Limited Edition , with plans to launch just 10 hulls of the exclusive design.

The Sunreef 50 Amber Limited Edition will have a carbon fiber mast and boom, four layout options and numerous amber-colored elements, including the hull.

Read more: Sunreef 50 Amber Limited Edition

Lagoon 630 Motor Yacht

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.

Read more: Lagoon 630 Motor Yacht

Fountaine Pajot MY 37

The Fountaine Pajot MY 37 easily accommodates the seafaring family with three- and four-stateroom options. In the three-cabin version, called ­Maestro, you’ll find an owner’s suite in the portside hull with a queen-size berth and en suite head. Two double-berth cabins and one more head are available for the kids. If your brood is bigger, the Quator setup features four double cabins with two heads.

The 37 is a traveler and can be powered with twin 150 hp or 220 hp Volvo Penta diesels. Top speed with the smaller engines is 17 knots, while it’s 20 knots with the bigger power plants. Interestingly, at 7 knots, the fuel consumption is the same, with either set of motors offering voyagers a 1 ,000-nm range.

Read more: Fountaine Pajot MY 37

Solarwave 64

Many yachts boast eco chops because they have a handful of solar panels that power the microwave or navigation lights. The Solarwave 64 , launched last summer, has the potential to run on sunshine alone. The vessel’s 42 solar panels generate 15 kW that are stored in batteries weighing about 1,300 pounds. They connect to electric motors.

Read more: Solarwave 64

Glider SS18

This British builder says it strives for design innovation and the Glider SS18 displays that DNA, the result of 8 years of research and development. She has a head-turning, catamaran hull form constructed from aluminum and composite materials. She is 60 feet LOA with a 17-foot beam, and has a relatively shallow 1-foot draft. Powered by quad Yamaha 300 hp outboards, she can reportedly reach 50 knots, and with her Stability Control System (SCS), should give a smooth ride while doing it.

Read more: Glider SS18

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