There is a reasonably simple solution. I had an electrician rewire my lighting receptacles, including my fan for the central natural gas furnace and the 120v supply for the gas range. He carried the feeder through an adjacent 50 amp DPDT breaker box and ran 30 amp wiring to an outside box with male setup similar to the 30 amp input on a small rv. I also have a natural gas water heater, so my ac needs and minimal. The only things I can't run are the central air or clothes dryer. I can even run the microwave or clothes washer if I carefully allot power.
I simply plug my 30 amp extension cord to the plug from my twin 2000 Hondas, go inside and reverse the DPDT breaker box switch. This way I'm either feeding from the generators or the power company. No way for the two to ever meet.
Whenever the outage ends I throw the switch the other way. I have one isolated receptacle that comes directly from my outside power box. I plug a radio into that receptacle and turn it loud enough to wake us up. When the radio comes on, I know the power is restored.
