Originally Posted by cruising7388
This really is perplexing. If the AC and microwave operate during inverter operation, the inverter is obviously delivering power so the usual suspect would be the GFIs. But on shore power, appliance loads on the GFI receptacles doesn't trip them which indicates the GFIs are not defective.
Inverter/chargers are typically set up to bond the neutral and ground paths when the inverter is delivering 120V but releases the neutral & ground bond when shorepower is providing 120 volts to the coach loads. Are your inverters set up that way?
Can you power down an inverter (one at a time) to see if the problem goes away?
Thank you for the reply. There are 2 inverters and each one appears to supply separate appliances, etc. It seems that one works perfectly on both shore power and also battery. That one controls the cooktop, microwave, etc. The other seems to be powering the lights, electrical outlets and some other items.
The cooktop inverter works perfectly. The other inverter seems to power everything properly with exception of the outlets. When on shore power, the outlets can power a coffee maker for instance, but the inverter hums. When on battery, the same coffee maker will cause all outlets to lose power.
We checked everything and the tv, microwave, lights, heat, cooktop, everything works properly, with exception of the outlets. It's odd.
We did already replace what we thought was a bad inverter, with a same kind from the original manufacturer and determined that it can't be the inverter because the same problem occurs.