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soooo I ordered 2x 12v 100ah lifepo4 batteries and realized too late that they are not to be used in series is there a way around this??? I need them to make 24 volt as I have also ordered a 24 volt inverter and would like life better if it did more than look pretty on the wall could I pull...

im making my double decker bus off grid and thinking of building the "Off grid home 48v System" with the 5kw inverter. Q. how small can I start, with regards to panels and batteries?. that's if I can expand as I go...?