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FYI, Saw this on my motorhome group on FB. Walmart has Chins 100Ahr LiFePO4 for $266. https://www.walmart.com/ip/CHINS-12V-100AH-LiFePO4-Lithium-Iron-Battery-100A-BMS-for-RV/1854728852 Delete this info if not allowed here.

For those into DIY electronics projects, here is a 1Kw MPPT controller project. For everyone else, this fellow gives a good explanation on how MPPT controllers work. https://www.instructables.com/DIY-1kW-MPPT-Solar-Charge-Controller/

I see a number of references on here showing chassis battery connections (battery charge connection to your trailer battery, DC-DC chargers etc) having the ground connection directly to the negative terminal of the chassis battery. I'm going to make the argument that it should goto the engine...