Hi Dave,
I would really appreciate any details.
What I’ve found so far is that Inverter RS can only charge from a PV AC unit that can react to frequency-change “commands” from the inverter. It also seems that it’s dangerous to connect the generator to the AC-out of the RS, as the generator will “fight” these frequency changes. Perhaps that’s what auto-stop is for 
Setting frequency shift commands aside, does anyone know how to configure it not to master the AC waveform but to synchronise with a generator?