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General Operation & Considerations of Parallel VRLA Battery Strings

From Storage Battery Systems, LLC.

The numbers of plates that are connected in parallel determine the capacity of a cell. For example, if one set of positive and negative plates is capable of providing 5 ampere hours capacity at the 8-hour rate, 10 sets of plates connected in parallel will provide 50 ampere hours capacity. Just as plates can be connected in parallel to increase the capacity of a cell, complete cells and series connected strings of cells can be connected in parallel to increase the capacity of the battery system. Use of parallel strings can greatly improve the reliability of a battery system in that should one of the individual strings fail, the balance of the parallel strings will carry the critical load though for a shorter period. It is most practical that the individual parallel strings all be of the same capacity as this will aid in avoidance of errors during installation and will make troubleshooting of the total system less complex.
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