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profdant139's avatar
profdant139
Explorer II
Nov 01, 2016

How to test working capacity of battery: not technical

(If you are a highly sophisticated technical battery expert, I advise you to stop reading. This post is designed for people like me, who are not experts.) I have two group 31 12V marine deep cycle...
MrWizard's avatar
MrWizard
Moderator
Nov 02, 2016
My five batteries have a c/8 rate of 135 amp hrs
The Mfg specs don't even list the a c/20 rate
I have five of these in parallel, a total of 675 amp hrs at c/8
My typical load 4 to 20 amps is way below the listed use loads and rates
At pre dawn hours I'm showing voltage from 12.6 to 12.74
76 to 80+ percent SOC

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