*hangs head in shame* lol i don't actually know, even though i know i should test it. there were a few overnight power outages for a few hours each and i know the unit ran beautifully for each. how long would it last until the battery actually ran out? on a single MJ 1200, probably a pretty lengthy amount of time. mind you, after a while, when temperature gets to be a consideration (winter) then you may have to add a heater into the equation if you got no hot water (a good fire and an old school kettle still works though!).
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