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The problem: the life of an expensive battery bank may be considerably shortened due to unbalanced charge status. A slightly higher internal leak current on one of the battery in a bank of multiple 24- or 48-V serial/parallel batteries would cause a lack of charging of that battery and connected batteries in parallel and the overload of the connected batteries in series. The solution: balance the batteries. Battery Balancer balances the charge status of two 12V batteries connected in series or multiple parallel chains of serial connected batteries. If necessary several balancers can be used in parallel. A 48V battery bank can be balanced with three Battery Balancers. Normally open alarm relay It closes when the red LED is turned on and opens when the same LED is turned off. Even more internal information and control with BMV-702 Battery Monitor Average Point monitoring function.