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Blue Soverign, your 1600 watt kettle will pull about 160 amps from the batteries, and should take a little under 4 minutes to bring a liter of water to the boil, which should take about 10 amp-hours out of your battery bank, but in reality will take 15 amp-hours out of the bank due to the relatively high current and Peukert's Law. Note that using an 800 watt kettle would take 8 minutes, but only take consume about 12amp-hours. No worries, but somehow you need to put the amp- hours back into the batteries.
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