Gary, you are missing one point.. Like myself , Chas is total electric (almost), I am total electric. I average more than 4,000KWh during winter..

I would say at least 15,000 watts generator would be needed for total electric for my house.. 2,500 sq feet.
2 heat pumps, 2 electic hot water heaters, range, two refrigerators, 5 TV's 2 microwaves, Jacuzzi, dish washer,2 laundry units(2 dryers and 2 washers), Music studio gear etc

I do have a 4,500 watt power inverter for emergency.