We are completely off grid and Using MultiPlus 48volt/5000va/70amp/230v. Had a week with no sun, so batteries were drained. Had to hook up backup generator. Generator had been on for 15 mins +/- and I heated something in the microwave and the power went out. Tried flipping main switch on power panel inside house - did not work. Had to flip the "On/Off/Charge Only" button on the inverter box to restore power to the house. When the generator is on, shouldn't everything work? Before we got our new system we had to frequently use the backup generator. As long as it was on, everything in the house would work. Thanks for any help.