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Fangpusun Battery Balancer Equilizer For 24V 48V Battery Bank

  • Sale
  • $79
  • Regular price $125

The problem: the service life of an expensive battery bank can be substantially shortened due to the state of charge unbalance.

One battery with a slightly higher internal leakage current in a 24 V or 48 V bank of several series/parallel connected batteries will cause under-charge of that battery and parallel connected batteries, and over-charge of the series connected batteries. Moreover, when new cells or batteries are connected in series, they should all have the same initial state of charge. Small differences will be ironed out during absorption or equalize charging, but large differences will result in damage due to excessive gassing (caused by overcharging) of the batteries with the higher initial state of charge and sulphation (caused by undercharging) of the batteries with the lower initial state of charge.

The Solution: battery balancing

The Battery Balancer equalizes the state of charge of two series connected 12V batteries, or of several parallel strings of series connected batteries.

When the charge voltage of a 24V battery system increases to more than 27V, the Battery Balancer will turn on and compare the voltage over the two series connected batteries. The Battery Balancer will draw a current of up to 1A from the battery (or parallel connected batteries) with the highest voltage. The resulting charge current differential will ensure that all batteries will converge to the same state of charge.
If needed, several balancers can be paralleled.
A 48V battery bank can be balanced with three Battery Balancers.

LED indicators.

Green: on (battery voltage > 27,3 V)

Orange: lower battery leg active (deviation > 0,1 V)

Orange: upper battery leg active (deviation > 0,1 V)

Red: alarm (deviation > 0,2 V). Remains on until the deviation has reduced to less than 0,14 V, or until system voltage drops to less than 26,6 V.

Alarm relay

Normally open. Closes when the red LED switches on, and opens when the red LED switches off.

Alarm reset

Two terminals are available to connect a push button. Interconnecting the two terminals resets the relay. The reset condition will remain active until the alarm is over. Thereafter the relay will close again when a new alarm occurs.



Victron Battery Balancer

Input voltage range

Up to 18 V per battery, 36 V total

Turn on level

27,3 V +/- 1%

Turn off level

26,6V +/- 1%

Current draw when off

0,7 mA

Midpoint deviation to start balancing

50 mV

Maximum balancing current

0,7 A (when deviation > 100 mV)

Alarm trigger level

200 mV

Alarm reset level

140 mV

Alarm relay

60 V / 1 A normally open

Alarm relay reset

Two terminals to connect a push button

Over temperature protection


Operating temperature

-30 t0 +50 °C

Humidity (non condensing)





Connection terminals

Screw terminals 6 mm² / AWG10

Protection category



0,4 kg

Dimensions (h x w x d)

100 x 113 x 47 mm