During hurricane Ike we used used 5.5 kw and 1 kw generator. The big one was mainly for the water heater and well (220v) appliances. After 3 days of trying to locate 10gal.\day fuel on my way to work in Houston, I bought the little gen. We ran stand-by power 2-3 hours in the morning, a couple of hours around lunch, and 3-4 hours in the evening. This schedule kept the fridge cold, batteries hot, and wife tolerable. Once I put the small gennie on line fuel consumption dropped about 70%. The best reports I got, were for the Honda 3kw generators, very quiet and not too thirsty.
I put a separate 40amp dual breaker in the panel with a pigtail for the 220 outlet in the generator. IF YOU DO THIS-- TURN OFF THE MAIN TO THE PANEL!!!! IT MAKES LINEMEN VERY ANGRY WHEN THEY GET BIT BY BACK-FEED FROM A GENERATOR!! IT HAS ALSO MADE A FEW LINEMEN DEAD!!! If you are not comfortable with doing these changes please have a professional set it up for you.
5kw is enough to run the water heater only or the well only so there was quite a bit of power management going on. When running the small one i just used extension cords. I highly reccomend that everybody have a few #12 awg cords as smaller ones are not good for high amp-draw appliances.
Cooking was not an issue as I had changed electric stove to propane. Using the oven frequently and normal cooking for 3, a regular 20 lb. propane bottle lasts 3-4 months.
Alternate Uses for Generators in the field
5kw. - Mig welder, plasma-cutter (low amp settings), air compressor, margarita machine.
1kw. - electric chain saw (starts every time I plug it in), blender.