Watt&Sea Cruising 600 Hydrogenerator – 600W, Short 610mm Leg (for Boats 35ft and above)

For larger sailing yachts and expedition boats, the Watt&Sea Cruising 600 (610mm) offers double the power of its smaller sibling, providing up to 600W of electricity. This makes it possible to meet substantial onboard energy demands – for example, running refrigerators, watermakers, high-output autopilots, navigation electronics, and communications – without needing to run the engine or genset daily. The Cruising 600 is particularly suited for boats over ~35 feet (10–11+ meters) whose energy requirements exceed the 300W model’s capacity, or for crews who simply want faster battery charging at a given speed.

The short 610mm version of the Cruising 600 is ideal if the mounting location for the hydrogenerator is near the waterline. Like the 300W model, this length provides good prop immersion on most boats with standard stern configurations (open transoms, fold-down swim platforms, etc.). If your vessel has a high transom, a 970mm long-leg variant of the Cruising 600 is available. At sailing speeds between 4 and 6 knots, the Cruising 600 operates efficiently; for instance, at ~5.5 knots with the 240mm propeller it provides around 10 amps (over 120W). As speed increases beyond ~6 knots, the power curve rises sharply – at 8 knots you’re already getting a few hundred watts, and around 10 knots you potentially approach the full 600W output (in optimal conditions and possibly using the smaller high-speed prop). This reserve of power means that even at moderate cruising speeds (5–7 knots) you have plenty of charge to run all systems and replenish the batteries quickly.

• Ideal for energy-hungry boats: The Cruising 600 is designed for cruising yachts, catamarans, and performance vessels that have more equipment on board. If you are running fridges/freezers, inverters, watermakers, or a suite of electronic instruments, a 600W hydrogenerator will provide the necessary current that the 300W version might not fully cover. This is especially important on long ocean passages when you want to avoid using a diesel generator for the sake of comfort and peace.
• Exponential power increase: A key advantage of the Cruising 600 is that beyond a certain speed (around 6 knots) each extra knot of boat speed yields significantly more power compared to the 300W model. For example, at 7–8 knots where the 300W might be giving ~200W, the 600W model might generate ~350–400W. This allows you to charge batteries much faster during daytime sails and to have surplus energy for storage or additional devices (e.g., running a watermaker while sailing).
• 24/7 hybrid charging with solar: Like other Watt&Sea units, the Cruising 600’s controller can integrate solar panels. This means during the day when the sun is shining, solar can contribute to your charging, and in cloudy weather or at night – whenever the boat is moving – the hydrogenerator takes over. Your energy system thus becomes highly resilient to different conditions, providing round-the-clock green electricity.
• Compact for its output: Despite the doubled power, the size and weight of the Cruising 600 remain quite manageable. The generator unit itself weighs only slightly more than the 300W version – around 7.4 kg (8.1 kg with the long leg). This makes installation and handling easy, without significantly weighing down the stern. The mounting process, lifting/lowering mechanism, and operation principle are identical to the 300W models, making it intuitive to use for those familiar with Watt&Sea.
• Engineered for heavy conditions: The Cruising 600 is built to withstand the higher loads at greater speeds – critical components like the prop shaft and mounting hardware are reinforced. The system has been tested in extended ocean voyages and races, proving its reliability. Whether you’re sailing through stormy weather or spending long periods in salty tropical waters, the hydrogenerator keeps performing as long as basic maintenance (cleaning off marine growth, checking bearings) is done. Watt&Sea Cruising 600 comes with a 2-year warranty, giving you assurance against manufacturing defects. With proper care, it will be your steadfast partner in generating power across thousands of sea miles.