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Old 24-11-2015, 23:03   #16
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Re: Capacity Testing Methods?

Originally Posted by smac999 View Post
that thing looks sweet. now to convince my boss to pony up

do you normally test single 6v batteries or in pairs at 12v?
If they are used in series for 12V I test them at 12V. A series parallel bank of say four 6V batteries gets two tests, one for each series pair.. On really large cells for 24V etc. I will often test individual cells..

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Old 25-11-2015, 17:58   #17
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Re: Capacity Testing Methods?

Thank you everybody -- especially Maine Sail -- who carried this thread. The input prevented me from buying, and quickly smoking, a $50 load tester in an inappropriate application. Every dollar counts...

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Old 25-11-2015, 19:43   #18
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Re: Capacity Testing Methods?

Originally Posted by shaneinseattle View Post
I've done a fair amount of research and cannot come up with anything firm on how to do this capacity test for my battery bank.

My 12V 540 Ah bank consists of six 6V 180 Ah Gel-Tech batteries and they are over 6 years old but lightly used and on charging almost all the time.

I haven't yet purchased load testers or anything of that nature; want to make sure I get the right equipment. Not sure if I test each battery separately, or can test the bank all at once. Can I test to 50% discharge or must I test to 100% DoD? The questions go on and on...

Any comments from technically astute people that know how to design a test for this size and makeup of battery bank would be MUCH appreciated!


I worked for a major corporation that spent millions every year replacing ups batteries. I was part of a team tasked to provide recommendations on battery replacement. After months of research the best recommendation was that load testing to predict failure was unreliable. For mission critical batteries swap out at 50% of the projected life. Redundant systems that are not critical but well monitored can be used till 95% PL with minimal failures

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