Although not a RV,mine is pop up slide in camper. My battery power is two 850CCA truck batteries. If I do not disconnect the batteries from the camper, they will not charge all the way.I have 800W, 2 cycle Harbor Freight Generator that I can plug the battery charger into, or run the camper directly off the 120V that the generator supplies, but the camper inverter changes it to 12V
