I got a submersible water heater on clearance for just a couple dollars. I immediately brought it home to see if I could make myself an off grid cup of coffee using solar energy.
I plugged the heating element into my off grid work shop solar battery bank through a power inverter.
I was surprised to see that this water heater did not use much energy at all from my solar power battery bank.
The batteries actually went from absorption mode into float mode while I made my cup of coffee. This means that I had power to burn and then some. The batteries were topped off and staying there even while I was burning energy.
It sure felt good to enjoy a cup of sun coffee in my off grid work shop.
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