Pretty sweet setup there. I'd personally always opt for more power. Could replace LPG with induction cooktops in theory; but I am not in a boat. Salt water is very hard on almost everything so it sounds like they have a system figured out.

Living off grid, on land is something I've been looking into. Power is everything. The more you have, the better your comfort is. Ideal build: ICF foundation/house, exterior insulation. DIY friendly horizontal geothermal for hvac and water heating, rocket mass fireplace as backup heat. Ground water well, dehumidifier backup water generation, large in ground water tanks. Solar panels everywhere, Lifepo4 batteries, in ground propane tank for backup power, extra solar power can be used for heating water; everything would be electric including cars. Greenhouse with ground to air heat exchanger pipes about 10 feet underground so the power of keeping it above freezing is just a fan. Septic drain field, if water is very scarce then grey water recycling.

Anything I missed on the ultimate off grid house?