Reality check:
30 amp shore power cord = 3.6 KW.
Heavy duty 24 volt 150 amp alternator = 3.6 KW.
Small genset = 3 KW. Smallish/medium generator = 5 KW.
You can - right now with no going out on a limb with an experimental system - buy an alternator that will give you as much power as your shore power cord. I don't see this as replacing wind or solar at all, the whole point of that gear is NOT running the engine. Do note almost everything is available in 24 volt versions and 48 volt equipment for boats is off in the future.
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