2oldman wrote:
Before you go the subpanel route, consider someday, maybe, you'll have enough power to run your a/c for short periods of time, like at rest stops. And are you sure of what outlets you'll want powered? It's really nice to have them all powered.
Yes, there is some overhead to whole-house (turning off things), but, just food for thought. Either way is fine...but once locked into the subpanel it could be difficult to extricate yourself.
x2
Absolutely! Stop for some grocery shopping at Wally World on a hot day, turn on the A/C, no need to fire up a generator. My bank will run the rooftop unit at least four hours, the dog can be happy while I'm inside shopping and I don't have to leave the truck engine idling. Come back to a nice cool coach, fix lunch or whatever, and then shutdown and hit the road. I'll fire up the generator while I'm driving, don't hear it, don't smell it, let it recharge the batteries.
I left everything wired to the main panel, but still installed a sub panel, mainly to hedge my bet. if (a) the a/c proved to be too much for the inverter, or (b) something went wrong with the transfer switch. the sub panel has a 20a service outlet attached to it, so I can have limited 120v access in an emergency.