Battery Equalizer 48V solar system battery Balancer 4S 12V Battery Voltage Balancer Connect the red wire to the positive terminal of the battery and the black wire to the negative terminal of the battery. Connect multiple batteries in the above manner. Handle unused wires to avoid short circuits. The equalizer is an energy transfer equalization. When the battery voltage difference in series exceeds 10 mV, the equalizer starts to work. The current flows from a battery with a