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I think if you search the phrase 'load bank' here you will find a few different designs. I built one years ago, inspired by another user here, on a rolling cart with heating elements from a clothes dryer. Its set up to be selectable load steps of 2.7kw, 5.4kw, 8.1kw, 10.8kw, and 13.5kw... all by changing which breakers I turn on.