In my 2016 Excursion, I have had the batteries stay charged when running down the road or when the generator was running. The only time I turn the inverter on is when dry camping, and the motor and gen are not running. Have only had the coach 6 months, so my experience may not be representative. Followup---the inverter box in the basement, is always turned on....the electronic on/off switch above the door (with all the other control switches) is only turned on when I want to run the fridge on battery....
