Never did it but was told that if the generator is started when you are plugged into shorepower, a lot of damage would happen. Just wondered if that is true.
Ours ,is like most or all I have seen. We have the gen running, with the ac running and plug in. Soon as juice from campground hits the generator cuts out. When we leave we cut the gen on and unplug. I wouldn't think, of running the gen, for a period, of time plugged in. No reason to. At most, it might run two or three minutes. If you can't trust your transfer switch not much purpose in having it. imo