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I have a switch between the battery bank and the charge controller. Should I switch it off during charging, or does it not matter? (My external battery charger can charge at 20A, and the Renogy Rover is the 20A version.)

I just set up a pretty basic mobile solar setup in my SUV. It's simply a 150W solar panel & Renogy 20A charge controller feeding a bank of two 12V 100ah LifePo batteries wired in parallel. Say I occasionally want to charge my batteries with an external battery charger (the ones that plug into...