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If the national average cost of consumer electricity is 13 cents per kilowatt hour and you are attempting to charge a 12 volt 70 amp hour car battery, then the cost of charging the battery may be calculated.
The battery is imperfect and will require about a third more than its ampere hour rating to fully charge it.
Assume it will take 100 ampere hours to charge the 70 ampere hour battery.
At a charge voltage is necessarily above the battery voltage, usually at about 16 volts, and 100 ampere hours, the result is 1600 watt hours or 1.6 KWH
The cost is then 20.8 cents to charge the battery calculated from 1.6 KWH times 13 cents per KWH.
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∙ 13y ago
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