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Old 23-10-2020, 15:31   #1
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Join Date: Sep 2010
Location: Eastern Shore, MD
Boat: Catalina 350
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Parallel and Series Cells for redundancy

It's time... My AGM bank is getting long in the tooth and time to retire.


I'm reading as much as I can on the installation and it looks really straight forward with a few caveats.


I was reading an older post about parallel and series battery connections with pictures, but the pics were no longer there. I like the idea of multiple cells to give some level of redundancy for the house systems bank. I am thinking there are two options for connecting these cells. I am thinking either will work with Option B being preferred.



Is there a consensus on this?


Thank you!



Mark
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Old 23-10-2020, 20:05   #2
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Re: Parallel and Series Cells for redundancy

The way you have thing arranged in your A and B there is no difference electrically and there is no redundancy provided other than there is an extra cable connecting each parallel pair of batteries to the next pair in series. Failure of a battery cable is a pretty rare event. I don't see much value in B over A. If you are really a "belt and suspenders" person you'd want to use B and double the top and bottom cables in the figure as well.
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Old 24-10-2020, 09:50   #3
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Re: Parallel and Series Cells for redundancy

Thank you for the input. Just making sure I wasn't missing something on the onset of this project as I work my way inside out.


Option A will actually work better in the space allocated. Glad to know there is no significant penalty.



Very much appreciated!Mark
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