Just thought I would post an update on this problem that I still have not resolved......
- My OP says that the microwave trips the inverter GFCI about 50% of the time. This is not true - it is actually more like about 20% of the time, 80% of the time it works fine.
- I tried disconnecting the inverter ground cable AND connecting the inverter ground cable directly to the trailer frame. No change - still trip the GFCI about 20% of the time.
- I opened the A/C breaker for the converter and plugged the trailer shore power cord directly into the inverter. Interestingly, this works great. I can run the microwave over and over again without tripping the inverter GFCI.
- I started to think that maybe it was the male plug that I built myself that plugs into the inverter for the cable that runs to the transfer switch, so I removed it and tried a different plug but that did not help.
- I have a 120V fridge in the back of my TT that plugs into an outlet. I turned this fridge on (pulls about 6-7 amps from my batteries) and tried the microwave with the fridge running. The GFCI would not trip. It would seem that with another A/C load on the inverter in addition to the microwave, it somehow helps the issue.
It may also be noteworthy to mention that IF the GFCI is going to trip, it will do so IMMEDIATELY when I hit the start button on the microwave. As long as the microwave starts, it will run to completion without tripping.
I am going to check the wiring inside my transfer switch to see if there could be some problem in there. I am also going to try plugging my microwave into a different outlet to see if that has any affect. However, if neither of these straws give me any new information, then I have to say that I am completely baffled........
