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I have a bi-level +/- 2k square foot house and run a 10hp 5k watt backfeed into my main. I also have a 3500/4k one as a spare. My father runs a 6500 generac and that thing is a pig on gas. I can run everything in my house off the 5k and its pretty good on gas (can't run the electric range or dryer but we don't need to in times of outages). After 9days + of no power and w/gas a commodity, i'm happy i didn't go w/the generac w/that many watts (any model really w/over 6k wattage output). I'd say in an average size house, 5k watts will give you the perfect balance of decent gas consumption and power needs. Thats one thing i learned...the other is one can actually live off of nutter butters for 9days.
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