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profdant139's avatar
profdant139
Explorer II
Oct 27, 2016

Is there a real-world test of a battery's true capacity?

My two group 31 batteries are rated at 110 amp hours -- and I never discharge them past 12.1 volts, or 50 percent state of charge. So that means, I think, that I should be able to get 55 amp hours ou...
pianotuna's avatar
pianotuna
Nomad III
Oct 28, 2016
Hi BFL13,

Actually Peukert is always "there" so going from 4 to 6 jars makes the real amp-hours used from the battery lower.

BFL13 wrote:
If your daily AH usage has not changed then it doesn't make any diff if you now have 6 instead of 4 batts for how much solar you need.

Having 6 does:

A. let you go longer without solar input, and

B. let you run the high amp draws with less voltage drop, which means staying above the inverter low voltage alarm setting better

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