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Wind generators, and solar panels will solve a lot of problems. Especially if you use 12V pumps. We live on 12volts on the boat for months at a time with 4 solar panels, and one wind generator. They run the fridge, lights, navigation lights, radar, autopilot, anchor windlass, watermaker, and numerous other articles with 2 8D batteries.
The boat's interior is about 600sq. ft. When I move to the South Pacific I will build a house that lives on the same system doubled. It is kind of like fancy camping.......LOL
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20mph is not fast, unless you are doing it in a 3/2, 1000sq. ft. house on 10 ft. waves! 
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