-
Everything that inverts goes through the inverters called (Pass through) what ever inverts goes through contacts in inverter, So if you plug a electric heater into a plug that inverts it is extremely hard on the contactors in inverter, you should of had 120v power on microwave ac’s anything that did not pass through inverters. Did he have you reboot inverters? Remove AC and DC power from inverters then turn on DC power then AC power. When I did RV service I sent in quiet a few inverters and had them repaired, Most caused from electric heaters on anything with large AMP draws