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Your battery SoC (state of charge) will only go down over time if the "average" or integrated kWh of consumption is higher than the "average" or integrated kWh of charging . Of course a battery bank cannot absorb charge anymore when it is (almost) full and a charger cannot "push" charge in the...

My few cents wrt charging LiFePO4 batteries : Some 12.8V (4S) LiFePO4 BMSs cannot handle the higher voltages that can occur if you put them in series to get a "24"V or higher voltage system. as mentioned above -better to use a battery bank with BMS prepared for the total system voltage (so an...

My few cents: Once you have an MPPT solar charge controller available in your system using this you can use any DC voltage you have allowed within MPPT charger & battery combination range allowed to feed power in, This MPPT has no clue whether energy comes from solar panels or from laptop...