Here in Wyoming I have a 12,000W propane powered back-up generator that automatically starts up and switches over when the power drops out. The transition takes a couple seconds and is virtually transparent, and I can run my normal household load off of it. Heck, sometimes I don’t even know the power has been disrupted until I look down the hill and notice the town has gone dark!
Mine is 2/3’s that size.
I pull the main breaker to the street; plug my generator into the welder outlet in the barn, and let ‘er rip!
I can run everything but my electric range and oven.
Furnace and water heater are propane.