I added a battery separator between the house banks and the engine battery. It will keep the engine battery isolated at all times until a charging source bumps the volts up, then it opens to allow the engine battery to charge.
I also tried adding an isolator between the house banks to keep a low-voltage bank from discharging the other bank. But now I seem to have blocked the House 1 battery from supplying power to the inverter… The question is how to allow the F20 to charge all batteries when connected to shore power, but then allowing both house batteries to power the F20’s inverter when disconnected. Hmmm.
