Have been plugged into shore power (electricity) at an RV park for 3 days. Unplugged today, drove to the desert, batteries at 100%. Checked batteries around 9:30 pm, down to 80%. Fired up the generator and after an hour or so the batteries read 100% but my wall panel where the inverter info is said "Charger Accept mode". I know what bulk, absorbtion and float are but what the heck is "Charger Accept Mode". What does that mean???