My solution to hot water... I have a 60 gallon 220ac hotwater heater. dual heater units. I replaced the upper heater with a 110 vac heater element and replaced the lower heater with a 36 vdc element. I connected the lower to two solar 300 w panels in parallel and i connected the upper heater to my 25,000 watt inverter/lifepo4 1,120 ah system. Here in AZ we have lots of sun, so its rare that i use the inverter. Been working perfectly for many years. seldom used inverter/battery, I maintain 110 F deg water temp.