by supersizeme on September 14th, 2007

supersizeme

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I have a 12V auto battery (rated 525A cold crank at 32F, reserve capacity 70), and a 400Watt (800W peak) 12V dc to 120V ac converter. How long can I use this setup to power a 26W fluorescent light bulb during power outage?

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  • by ChaiCustard on September 16th, 2007

    ChaiCustard

    Well,first work out capacity:
    Figures are:
    70minutes = 1.16hours, at 25amps (is RC standard), & 12.5Volts (an estimate between 13.8 and 10.5, based on 26W).
    These give 25*12.5*1.16 = 362.5 watt-hours
    If you assume 90% efficiency of the converter, then it will run for 0.9*362.5/26 = 12.5hours.
    I would guess this is a pessimistic length of time, because it is derived (extrapolated) from a 25 amp discharge rate. The actualy time should be longer (because actualy discharge should only be around 2.1 amps).
    If you have the "Amp-hour" rating of the battery, that would be a better figure to use.

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You're reading I have a 12V auto battery (rated 525A cold crank at 32F, reserve capacity 70), and a 400Watt (800W peak) 12V dc to 120V ac converter. How long can I use this setup to power a 26W fluorescent light bulb during power outage?

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