Looking at my electric bill, there’s a section saying “this percent came from [ex: Air conditioner, major appliances (fridge, oven), etc]”. How do they know that?
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They’re guessing based on the change in current draw when things turn on and off. It’s a fairly educated guess. They can’t tell the difference between an air conditioner or large air compressor, for instance. They just know something was sucking some major juice.
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