This is for our outlet box on a cord reel fed from the generator. We have a dedicated 30 amp 240 v for the electric fan, and two 20 amp 120 v for flood lights.
I have to look into how our battery chargers are wired, they charge off the shore line but they also charge when the generator is running. I assume there is some backfeeding going on, which I don't think is a big problem unless the auto-eject fails and the generator is running when you start the truck.
