Are there any concerns with operating batteries in parallel?
In general, batteries can be operated in parallel with very few problems. Whether the rated capacities are unequal, or whether the circuit impedances are different, has basically no effect on battery operation. This is supported by two recent technical papers (Intelec ’98 and Intelec ’99), which have contradicted a lot of the old ‘conventional wisdom’ about parallel strings. The important thing is that the system charging voltage must be suitable for all connected strings. While statements are sometimes made that no more than four or five strings should be connected in parallel, telecom companies routinely connect 20 or more strings to the same bus without problems. It is recommended, however, that each string have an individual disconnect device for servicing. One concern that can arise with parallel strings, however, is when a lower-voltage string is connected with one or more higher-voltage strings. This can occur, for example, when a new string is connected with strings that are al
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