Tom, "built in transfer switch" things are looking up, It's been, probably at least ten years since I looked at solar power, I know prices have come way down. Does the idea of running the house on solar with Lister back up and using grid power for the big 240 loads sound too crazy? I have a retired marine engineer neighbor thats helping me out for trades, I towed his tractor to the tractor doctor, things like that. He wired up the 3KVA transformer and checked everything out. I recently built a long (64x10) storage shed, (my motto being, never throw anything away that could possibly be useful in the future) with the shed roof slopping toward the south and not far from the generator room, perfect for some panels. So it seems I can hardly pass up, at least, taking a serious look at solar and I would save a couple bucks on the grid power bill.