Watt&Sea

Sea 300W hydrogenerator that converts a sailing yacht’s motion into electricity. The short 610mm leg is ideal for mounting on low transoms, keeping the propeller submerged for peak efficiency. Suited for boats up to ~35ft, this unit provides sustainable power for onboard electronics and batteries, greatly reducing engine runtime.

• 300W green power: Delivers up to 300W (24A @12V) of renewable energy, covering the electrical needs of small to mid-sized sailboats and cutting dependence on the engine or fuel generator.
• Short 610mm leg: Perfect for vessels with low transoms or open sterns – ensures the prop stays submerged even in chop, maintaining continuous charging. (A 970mm long-leg version is available for higher transom installations.)
• Efficient at cruising speeds: Produces roughly 100W (~8A @12V) at around 5 knots with minimal drag. Begins charging as low as ~4 knots, which is enough to power essentials like autopilots, navigation instruments, and lights while sailing.
• Smart controller: Includes a converter that auto-detects 12V or 24V systems, optimizes charging, and offers Bluetooth monitoring of power output. Features an input for a solar panel, enabling hybrid charging (wind + solar) for maximum energy capture.
• Lightweight & robust: Weighs about 6.3 kg, built with marine-grade aluminum and composites. Quiet and streamlined – generates energy without slowing the boat, and designed to be easily lifted out of water when not in use (e.g., in port or if you hit debris).

Watt&Sea 300W hydrogenerator with an extended 970mm leg, designed for boats with higher transoms or requiring a deeper propeller immersion. Delivers the same output (300W) and benefits as the standard Cruising 300, keeping your batteries charged on sailboats up to ~35ft, with minimal drag.

• 300W power generation: Supplies up to 300W of clean energy (24A @12V), meeting the consumption needs of mid-sized yachts and preserving battery health on long voyages.
• Long 970mm leg: Ideal for vessels with tall sterns, pushpits, or raised mounting points – ensures the prop stays submerged even in waves or when heeled. (A 610mm short-leg version exists for lower transoms.)
• Peak efficiency: Produces ~8A (~100W) at ~5 knots and increases output at higher speeds. The longer strut does not compromise thrust – drag remains very low, with no noticeable slowing of the boat.
• Auto 12/24V controller: The smart converter manages charging, compatible with 12V and 24V systems, featuring Bluetooth monitoring and an extra input for a solar panel to enable hybrid charging.
• Versatile & robust: Same lightweight design (~7.0–7.5 kg) in anodized aluminum and composites. Easily lifted from the water, nearly silent operation, and backed by a 2-year warranty – an ideal companion for any cruising yacht.

High-power Watt&Sea 600W hydrogenerator for sailing yachts over 35ft, equipped with a short 610mm leg for mounting on lower transoms. Delivers up to 600W of clean energy from your boat’s movement – ideal for long voyages and larger vessels with greater consumption. Starts charging around ~4 knots, and above 6 knots the output increases exponentially.

• 600W high output: Up to 600W (48A @12V) of renewable power, enough to run the electronics and appliances of bigger yachts and catamarans, minimizing the need for fuel generators.
• Short 610mm mast: Suitable for boats with low swim platforms or transoms near the waterline – keeps the prop optimally submerged. (A 970mm long-leg version is available for higher transoms.)
• Efficient at cruising speed: Provides ~10A (~120W) at ~5.5 knots with the included 240mm prop, and significantly more at higher speeds. Beyond 6 knots the output climbs rapidly, supplying ample current for all onboard systems.
• Smart 12/24V controller: The intelligent regulator adapts to 12V or 24V battery banks, protects against overcharge, and allows Bluetooth monitoring. Also features a solar panel input for combined charging (solar + hydro).
• Rugged & lightweight: Weighs ~7.4 kg, built from aluminum and durable composites. Engineered for ocean passages – quiet, dependable, and ultra-low drag. Easily lifted from the water and maintained, with a 2-year warranty.

Watt&Sea 600W hydrogenerator with an extended 970mm leg for vessels with high transoms or unique stern configurations. Delivers up to 600W of power from the boat’s motion, covering the needs of large yachts and catamarans. The long mast ensures the prop stays optimally submerged in waves, with the generator starting to charge ~4 knots and providing exponentially increasing output above 6 knots.

• 600W supply: Maximum output 600W (24A@24V / 48A@12V) for reliably powering all onboard systems of 35–50+ ft yachts.
• Long 970mm strut: Ideal for mounting on high transoms or distant swim platforms – keeps the prop submerged even in heavy seas or when the hull heels. (A 610mm version is available for lower transoms.)
• Optimal yield: ~10A (@12V) at ~5.6 knots, significantly more at 7–8 knots. Approaches full 600W around 10 knots (with appropriate prop), covering heavy consumers on long voyages.
• Automated controller: Includes 12/24V converter with intelligent charge management and Bluetooth monitoring. Supports solar panel input for maximum energy independence (solar + hydro generation).
• Offshore tough: Weighs ~8.1 kg, robust aluminum construction designed for speed and load. Easy to service and retract; proven reliability in transatlantic races (2-year warranty).