It's personal choice, no set formula.
My view, is that it's not healthy to appear to be better off than your neighbors. Some people don't understand the relationship between work, planning, and having stuff. They only see that you're warm and lit, and they are cold and dark. Some folks will try to bring you down.
Much like the old Russian who found a genie bottle. Having released the genie, he was promised one wish. "I wish that my neighbor's cow should die."
I wouldn't want a whole house generator. And, if I had one, I'd be using blackout curtains.
Christopher A. Young Learn more about Jesus
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like 10kW or 20kW.
and if so, which one and how much?
Or just stick with a 2kW, or so and time multiplex each operation - a little fridge time, a little heater time, a little well pump time, etc.