Back up charging question... possible damage to system?
I have an off grid cabin with Renogy Panels and their MPPT charge controllers. It will be my first winter and I will not be up every weekend. I have the panels at the right angle for winter which is pretty steep but I am in a snow belt and there was about 5 feet of snow on the ground last year. I was wondering if I get there and the panels are covered and the batteries too discharged can I just connect a good quality automobile battery charger to the same terminals that come out of the charge controller and crank up the back up gas generator or should I disconnect the charge controller first when attempting to charge the batteries at night or poor sunlight?