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solar rule of thumb
Currently the rule of thumb on solar is 100 watts per 100 Ah of battery.
Our experience is it takes closer to 140 watts.
For 120 volt ac devices divide the wattage by 120 and multiply by 10 to get an approximate DC current. This ignores inverter efficiency.
The most accurate way is measure the AC devices with a Kill-a-Watt and DC with a clamp on DC ammeter. Lowes and Home Depot for the Kill-a-Watt and watch Sears to put their AC/DC clamp on meter on sale. Sometimes you can find a Radio Shack that is still in business that has a similar clamp on. Both are about $60.
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