I have been very successful heating hot water with 120V inverter power from battery, restored by excess solar power. I changed the element in my junky 10.5 gallon Atwood water heater to a 2000 Watt/240V, at 120V this is just 500 Watts. This does not overload my 1700W inverter or wiring. Anyway, what I found was that 1/2 hour a day of heating gives me hot shower water. A smaller tank would take less time and a more insulated tank (Mine has 1/2" fiberglass insulation) might hold this for 2 days. Adding up the BTU input does not give these figures, there must be some carry over day to day. I use a 1 hour home depot bath fan timer so that I don't forget to turn it off. Lee Haefele Leopard 38 Alesto 2 moored at Jalousie, St Lucia
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