@GlenDoug and @DailySolar are right to pin that down first, but I'd add a third possibility worth checking: if you're on a shared battery bank with any other charge sources (shore power charger,...
Interesting unit, but I'd be cautious importing this into the UK given the support situation. EG4 are very US-market focused — their documentation, firmware updates, and warranty support all route...
@RiverFinn's got a point about the noise, though modern units are quieter than older designs. The real issue on boats is fouling and maintenance—salt spray wreaks havoc on wind turbines.
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