What Is a Wind Generator?
A small wind turbine fitted to the stern mast: the only source that can keep producing at night, but if the expectations are wrong it quickly becomes a noisy disappointment.
A wind generator is a small turbine mounted on the boat, usually on the stern mast: it turns in the wind and charges the batteries via a regulator. Output rises with the cube of wind speed: at 10 kn it is modest, at 20 kn it can produce serious amps.
The right way to look at it is as a partner to solar, not a competitor: solar produces in daylight and calm weather, while wind produces at night and in stronger conditions. At anchor in a northerly, it can keep the fridge going through the night.
Realistic expectations
Aegean summer: in light breezes, output is modest; a wind generator suits anyone who wants to top up their solar, not anyone looking for a single all-in-one source.
Vibration: an unbalanced blade or a loose mast fitting can send resonance down into the cabin; proper mounting pads and balancing are the answer.
Brake it in a blow: at 40 kn, a free-spinning turbine is a consumer, not a producer; you need to know how the electrical brake and securing method work.
The deciding factor: do you spend nights aboard and the winter season on the boat? If yes, solar plus wind gives real energy freedom; if you only use the boat for summer weekends, an extra solar panel will often deliver more amps for the same budget.