So here's an interesting 'problem'. It's been stated (by battery mfg) that I should not keep my LIFePO4's at fully charged state (100%) for an extended period of time, better to keep them at 50-80% SOC. Once I'm back camping (normally boondocking), I guess I can turn off the solar the day before and run the microwave until I draw them down. For right now while I'm still building the system, I am hooking up each battery individually to my old 2000W inverter. I ran an incandescent light for a few hrs but it did not appreciably drop my SOC (good news I guess?) - any creative ideas on what to run to draw down as efficiently as possible to 80% (will need to do it 4 times, mind) without exceeding 100A (which is the draw limit/battery until I hook them all up) - each battery is 100 AH.