Five (5) midpoints, Maybe five (5) balancers?

DIY
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1

My battery bank is 10 12V 105Ah cells arrayed into 5 series-parallel 24V cells, attached to bus bars, the midpoints are connected, and with a single Victron battery balancer as per (1) the forums and (2) Anders at Swedish Marine in California (GREAT guy, really helpful).

My question: why not have five balancers? Here’s why; the battery bank is middle aged and occasionally wanders up to a midpoint alarm at 2.4%. My feeling is that FIVE cells is too many for the one balancer. I’d like the whole bank to last a couple more years so I’m keen to baby each individual 24V cell. Maybe each having their own balancer will achieve this? Please advise.

2

If you have the midpoints connected, you can only use one balancer I think. It then is a 5p2s array (2 serialed batteries of 5 paralleled cells each)

If you don’t connect the midpoints, you can and NEED 5 balancers, cause it’ll be a 2s5p array (5 paralleled batteries of 2 serialed cells each)

p/s : You may find definitions the other way round, there is no “standardized” notation for that.

quick drawing:

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3

Thank you, I think your answer settles it. MORE BALANCERS (after disconnecting the midpoints, of course). At least the balancers are (relatively) inexpensive :alien:.