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Do you have a well? I sized our original backup generator to handle the surge current needed to start our 240V well pump. I'd turn off the rest of the 240V stuff when we were on generator. It was adequate, but the lights would dim when the well pump kicked on and the microwave was distinctly weird sounding when it was consuming generator juice.
We've since installed a whole house unit because we added an outbuilding and the old generator just couldn't cope anymore.
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