Arvil
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I don’t think you can get amp-hrs from that, Watts, volts, amps, doesn’t tell you how big the battery or cell is. Sorta like a tank of water, I can develop a pressure and a flow with a pump, but it doesn’t tell me how big the tank is. Maybe you can calculate how many watts or amps will run average for how many hours it’s needed, then add a safety factor of some sort.