Victron Battery Balancer Voltage Stabilizer

The battery stabilizer balances the state of charge of two series connected to 12V batteries or several parallel series of connected batteries.
When the voltage of the 24V battery system exceeds 27V, the battery stabilizer will operate and compare the voltages of the two battery series connected to the battery. The battery stabilizer will draw up to 1A of current from the battery (or from the parallel connected batteries) with the higher voltage. The resulting charging current difference will ensure that all batteries converge to the same state of charge.

If necessary, multiple stabilizers can be connected in parallel.
A 48V battery can be stabilized with three battery stabilizers.