Posted by VernMI on January 27, 2011 at 04:50:47 from (209.86.226.22):
In Reply to: O/T battery life posted by Nancy Howell on January 26, 2011 at 21:47:35:
That 975 CCA is Cold Cranking Amps not AH, Amp Hours. In order to convert to AH you need to divide that number by 20. 975/20 = 48.75 AH. Since there are two batteries theoretically you have 97.5 AH of power. So divide the 97.5 AH by the 2 AMP draw and you have 48.75 hours of use at a 2 amp draw. These lead acid batteries do not discharge at a linear rate so your results will not quite equal the calculated results. STARTING BATTERIES are not deep-cycle worthy. So, you can only have the first 20% of that CCA/20 figure without damaging that battery.
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