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    Battery usage time calculation.

    I need help in calculating battery usage time. I have load 1800W for 220V circuit I am planning to use inverter 12V to 220V, nominal power 1500W/max 3000W Batttery 12V, 142Ah, 850A 1800W (load) / 12V (battery voltage) = 150A So working time: 142Ah / 150A = 0,94h?
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