Gerald55 wrote:
It is almost certainly the case that shore power and the generator are connected to AC system through a transfer switch that only lets one or the other power the house AC at one time (generally it will choose the generator if both are on). At least no manufacturer would release a rig that didn't work that way.
So when you hooked your inverter up to shore power, and then turned on the genny, you were probably simply powering everything via the generator at that point, and the inverter was effectively disconnected at the transfer switch.
Not sure there was a transfer switch. He said that used a shore power cord - with all the mental work that comes with this method, i.e. remembering to disconnect the loads. Doable.