Question

How do I calculate watt hours?

Answer 1

Amp Hours X Voltage = Watt Hours

That means that our 100 amp battery can sustain about 1200 watts from devices for an hour or 600 watts worth of devices for two hours. In a real-world example, our humidifier lists a wattage of 280w on low and 470w on high.Dec 12, 2020');})();(function(){window.jsl.dh('_uP6KYKGqAfW10PEPkrOwEA43','

Estimating your Power Demands | Power Consumption Guide

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Search for: How many amp hours is 300 watts?

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So to work out the amps at 12 volts you divide 300 watts by 12 volts and you get 25 amps; on top of that you have the inverter efficiency to add to that figure. Divide 25 by 0.85 (85%) and you get about 30 amps.