Battery Balancer

Alarm relay

Normally open. The alarm relay closes when the red LED switches on and opens when the red LED switches off.

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Spec Sheet

Order Number: BatteryProtect-220A

Description

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.

Features

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 27,3V, 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 0,7A 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 > 27,3V)
Orange: lower battery leg active (deviation > 0,1V)
Orange: upper battery leg active (deviation > 0,1V)
Red: alarm (deviation > 0,2V). Remains on until the deviation has reduced to less than 0,14V, or until system voltage drops to less than 26,6V.

Alarm relay

Normally open. The alarm relay 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.

Even more insight and control with the midpoint monitoring function of the BMV-702 Battery Monitor

The BMV-702 measures the midpoint of a string of cells or batteries. It displays the deviation from the ideal midpoint in volts or percent.
Separate deviation percentages can be set to trigger a visual/audible alarm and to close a potential free relay contact for remote alarm
purposes.

Technical Data

Victron Battery Balancer
Input voltage range Up to 18V per battery, 36V total
Turn on level 27,3V +/- 1%
Turn off level 26,6V +/- 1%
Current draw when off 0,7 mA
Midpoint deviation to start balancing 50 mV
Maximum balancing current 0,7A (when deviation > 100 mV)