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Mitigate Risk - Series/Parallel Battery Strings

Mitigate Risk - Series/Parallel Battery Strings

Mitigate Risk - Series/Parallel Battery Strings

(OP)
Can someone advise me the risk/benefits of parallel battery strings.

The requirement is 120V/800AH but we try to standardize on Liberty 1000 series batteries.  At one location, the vendor installed a parallel string consisting of two(2)X 40 cell LS3-400 (3vpc)in parallel.

  pos--+--C-C-C-C-C-C-C-C-...-C-C-C-C-C-C-C-C-C--+
       |                                                  |
       +--C-C-C-C-C-C-C-C-...-C-C-C-C-C-C-C-C-C--+--- NEG
              (40)  

The second location consists of 4 cells in parallel with another 4 cells seriesed in 10 segments.

  pos--+--C-C-C-C--+---+-C-C-C-C--+
       +--C-C-C-C--+   +-C-C-C-C--+--- NEG
              (1)          (2) ...

I am not familiar with the benefits of the second scenario.  Parallel strings are not desirable but the open state failure mode of VRLA batteries has unacceptable consequences.

Terry

RE: Mitigate Risk - Series/Parallel Battery Strings

Hi Kasane,

what is your application?
Traction or stationary (UPS)?
The problem with parallel strings is that single cell-voltages could drift apart.
Depending on your application you should check the single cell-voltages regularly.

regards
Roman.

RE: Mitigate Risk - Series/Parallel Battery Strings

i would like to know the risk-benefits of the petroleum indusrty. To the enviornment also to the health of humans and other species.

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