Parallel Battery Strings; High Temperature Operation - C&D Technologies LIBERTY 1000 Series Installation And Operating Instructions Manual

the affected cells may become sulfated and require corrective action.

1.6 Parallel battery strings

When strings of batteries of equal voltage are connected in parallel,
the overall capacity is equal to the sum of the capacities of the
individual strings. When paralleling valve-regulated batteries is
necessary, the external circuit resistance must be matched for each
battery. A large variation between battery string resistance can result
in unbalanced discharge (i.e., excessive discharge currents in some
batteries and less discharge in others). As a consequence, cell
failures in one battery string and the subsequent loss of performance
capacities of that string will result in higher loads in the lower resis-
tance interconnections of some parallel strings that may exceed
the ratings of the battery interconnections and/or cables. C&D
Technologies recommends paralleling strings to obtain higher capacity.
Paralleling cells is not recommended due to potential safety and
maintenance problems.

1.7 High temperature operation

Operating a battery at temperatures exceeding 77°F (25°C) will reduce
battery service life. Elevated temperatures accelerate the electro
chemical reaction within lead acid batteries.
Refer to Part 2, Sections 3.4 and 3.5 for more information concerning
"Effects of Temperature."
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