20 KW is a HUGE (Hugh?) generator for one house. You could go completely off-grid, with that. And so could two of your neighbors.
With load averaging, we used to allow 5KW per house, including A/C. Double that for today’s wired world, I guess - but that has to be overkill. A/C burns more than everything else in your house, unless you have electric strip heat.
No, even a 20KW generator just doesn't do much than keep on the essentials, and a few extras.
The house is all-electric. A big part of it is the heat pumps. They can take a lot of power. During the winter, if it gets really cold, the “electric furnace” comes on, and a single heat pump (we have two) will take something like 50 or 60 amps (I forget the exact numbers) at 240 volts.
As well, the clothes washer - electric - is a pig, so are the double-wall ovens and the cooktop, and I have a lot of computers, including my corporate server, that need to be up, etc. Even the well and the water conditioning system are not inconsiderable loads.
The average usage isn't very much, but the problem is that when certain things come on, they need a whole bunch of juice for the short period of time that they're on. We have 400 amp service into the house.
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