I watched the same video to inform myself prior to the purchase, if I remember correctly he was off grid in Hawaii.
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My house inverter is grid tied so I have a backup for the start up spike in energy.
I saw video of a guy installing one in his off grid house. He was mostly stoked with it because it only drew about 300W. But had a problem because it would do a check of the heating elements on startup which would crowbar his inverter. He fixed that by installing lower wattage elements.