Hydrogeneration for Offshore Sailing Yachts
Learn how hydrogeneration can support a lithium battery bank during offshore passages when a yacht is moving continuously.
Hydrogeneration uses water flow past the moving vessel to produce electricity.
It can be valuable offshore because it produces power day and night while the yacht is sailing.
Best use case
- offshore passages
- long ocean crossings
- autopilot-heavy sailing
- Starlink and navigation loads
- limited deck area for solar
Weak use case
At anchor, the boat is not moving through the water fast enough for a conventional hydro generator to provide its normal benefit.
Hydro therefore complements solar rather than replacing it.
Check the whole charging path
A charger setting is only one part of the result. On the boat, charging performance depends on the source, regulator, cable path, temperature, battery limits and what happens when the BMS asks the source to stop.
- Record sustained output after the alternator, controller or charger is hot—not only its nameplate rating.
- Verify voltage limits, temperature sensing and shutdown behaviour against the battery manufacturer’s instructions.
- Compare daily energy used with energy that can realistically be replaced in the available charging window.
Related pages
Charging Marine Lithium Batteries from an AlternatorLearn how to charge a LiFePO4 house bank from a yacht engine alternator without overheating the alternator or losing BMS control.DC-DC Chargers for BoatsLearn when a DC-DC charger is useful for charging a lithium house bank from a boat alternator and starter battery.Shore Power Charging for Marine Lithium BatteriesUnderstand lithium shore charging, charger profiles, inverter-chargers, marina power and AC safety on Australian boats.Marine Inverter-Chargers and Lithium BatteriesChoose a boat inverter-charger by AC load, surge, DC current, charging current, shore power and battery BMS limits.Solar Panels for Marine Lithium BatteriesDesign yacht solar for LiFePO4 batteries with MPPT charging, shading, array size, daily kWh and Australian cruising conditions.MPPT Solar Controllers for BoatsLearn how to size MPPT controllers for marine lithium systems, including panel voltage, controller current, BMS integration and multiple arrays.