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I have a 5500 watt Coleman with a Subaru engine it will run some lights, fans, the fridge, microwave or coffee pot, a small window unit and, if you turn off everything else, even the water heater.

I am an electrician and I installed a receptacle wired to a breaker in my box so I could back feed my house. It works very well but, unless you really know what you are doing, have a qualified licensed electrician install it for you. You have to turn off your main and then turn on the generator it's better with a transfer switch or interlocked breakers.