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Is that with or without the A/C running? Refrigerator(s)? Toaster? Electric oven? All the lights in the house on or off?
Totally meaningless calculation--it's just a snapshot. It would be like trying to determine your fuel usage based on the amount you use in one second of driving.
Also, most utitlities have a stepped rate schedule--so much per KWh for the first 500KWh, then so much for the next 1000KWh, and so on... Add to that a flat service fee based on your amperage service (60A, 100A, 200A, etc.).
If you really want to know what any given appliance is costing you, use this: http://www.p3international.com/produ.../P4400-CE.html
I know a lot of guys in the home generator forums use these to check the quality of their output.
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