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How do you know what unit is powerful enough to use Sub Zero 36" Refrigerator?

It depends on the power requirements of your fridge, which you don’t give us. But I think it’s safe to say that the Bluetti AC200P could power almost any residential refrigerator/freezer. Bluetti AC200P 2000Wh/2000W Portable Power Station|Solar Generator

Search for the rating label inside for watts or amps ( multiply the amps by 120 volts to get watts). Use that number to detemine peak power need which is when the compressor runs.