MrWizard wrote:
of these GFI outlets can be reset and work from inverter power
But trip and will not work from shore or generator
You probably damaged the ats and there is a ground fault in the ats
It's almost certain that there's a ground fault somewhere downstream of the GFCI in question. If the ATS is upstream of it (i.e. if the GFCI is on one of the RV circuits, and the ATS switches the input to the RV electric panel as is common), then it's not the source of the problem.
The likely reason that the GFCI does not trip on inverter power is that the inverter does not bond neutral and ground, and so even though there's a ground fault no current flows through it as the ground doesn't provide an electrical path back to the inverter output. It's not likely to be a faulty GFCI in this case, in my opinion, since it does reset and apparently work on inverter power.
