I have a Thor Tellaro 21J that came with 2 100amp lithium house batteries. I upgraded to larger capacity batteries, but now have the old ones just laying around. I have been trying to sell them to no avail, but then had what seemed like a good idea: buy an additional inverter and bring the old batteries with me on the road. When the installed house batteries get low, plug in the old batteries into my RV (with an adapter) to the inverter to charge the new batteries up a bit. Here is what I was trying (the battery isn't connected to the inverter in the photo):
I didn't seem to get a charge at all and the control panel was giving me an error. Is the inverter not the right kind or maybe the whole concept is flawed?
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