Mitigate Risk - Series/Parallel Battery Strings

[Kasane]

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

 

[r19h72]

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.

 

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