Battery Bank Failure

It has become evidentially clear that there is at least one failing battery in our current bank.  This causes a real dilemma given the spring plan was to double the bank size by adding another 8 batteries.  We’re not ready to replace the entire battery bank, but adding fresh batteries to dying ones would be a wasted investment.

Currently our bank has eight Crown 430Ah 6v deep cycle batteries wired in series.  We’re thinking one of the eight in the culprit .  The last couple weeks have been a struggle to keep the bank’s voltage where it should be and even when the SOC is at 100% there voltage never gets them to a float state. 

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