The Victron balancing unit equalizes the state of charge of two 12V batteries connected in series or multiple circuits of batteries connected in series. When the charging voltage of a 24 V battery system reaches above 24 V, the balancer will activate and compare the voltage across the two batteries connected in series. The balancer will charge the battery with the highest terminal voltage (or parallel connected batteries) with a current up to 1 A. The resulting difference in charging current will ensure that the batteries will reach the same state of charge. If necessary, several balancing units can be connected in parallel. A 48 V battery can be balanced with 3 balancing units.