The first hull of the Sunreef 100 Eco is in the water in Gdansk, wearing a skin of solar panels instead of a paint job and twin electric motors instead of diesels. At 29.26 metres, she is the largest fully solar-electric sailing catamaran Sunreef Yachts has built, launched in mid-June 2026 for a returning client who reportedly named her Ipharra II — a nod to the yard's earlier Sunreef 102 Ipharra. The pitch is simple: a 96-footer that can dock, reposition and cruise short distances without burning a drop of fuel.
A drivetrain built around the sun
The propulsion numbers read like a clean-sheet design rather than a diesel boat with batteries bolted on as an afterthought. Twin 360 kW electric motors draw from a 770 kWh battery bank, and the package is sized for harbour manoeuvres, repositioning and short hops in silence.
What feeds the batteries is the more interesting part. Sunreef wrapped roughly 242.5 square metres (2,610 sq ft) of its flexible solar panels across the bimini, superstructure and hull — panels the yard's R&D team says are under a millimetre thick and weigh less than two kilograms per square metre. Peak output runs to about 46 kWp. For a sailing cat, that is a lot of generating surface, and it is built into the structure rather than perched on a hardtop.
The beach house between the hulls
Deck space is the catamaran's natural advantage, and Sunreef has leaned hard into it. The 100 Eco's signature is the aft Ocean Lounge, a beach area slung between the hulls just above the waterline for lounging, swimming and launching toys. There's an "invisible" garage for two jet skis, twin fold-down bulwarks that widen the main deck, and an aft platform that opens into what the yard calls a seaside terrace.
Below, the layout is owner-configurable: four to five staterooms with a main-deck master option, and guest capacity that sources put anywhere from 10 to 12 depending on the build. Design, naval architecture and interior were all done in-house.
How big she really is inside
The yard says the platform yields a vast amount of living space for the length — the kind of volume you'd expect from a monohull a good deal longer. That is the standard catamaran trade, done at scale, and it explains why a client would commission this over a comparable displacement yacht. Reported living-space figures vary between sources, so we'd take the precise square-metre count with a pinch of salt until the as-built spec is published.
Francis Lapp, Founder and President, Sunreef Yachts:“With the Sunreef 100 Eco, we are proving that the future of superyachting can be both luxurious and responsible.
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What happens next
The hull now heads into final outfitting and sea trials, with a world premiere booked for the 2026 Monaco Yacht Show. That is where the real questions get answered: silent range, charging behaviour under a Mediterranean sun, how the solar skin holds up in service. Renders sell the idea. A season of cruising proves it.
The interesting bet is the order itself: a repeat owner committed to a second Sunreef built around solar. Brand-loyal demand for a fully electric platform at this size is the signal worth watching.
What's on the water in Gdansk is a serious attempt at a no-diesel cruising catamaran at 96 feet, from a yard that has been building solar-electric cats longer than most of its rivals have been talking about them. Monaco in September will tell us whether the engineering matches the renders.
Photo: Sunreef Yachts (official render). Source: Megayacht News.
