Victron Battery Balancer BBA000100100 equalises the state of charge between two series-connected 12V batteries in a 24V battery bank. It helps reduce midpoint voltage imbalance, uneven charging and the resulting strain on batteries in caravan, motorhome, marine and off-grid power systems.
For a 24V bank, use one Battery Balancer across the two 12V batteries. For a 48V bank made from four series-connected 12V batteries, use three Battery Balancers. Multiple balancers can also be connected in parallel where additional balancing capacity is required.
Why use a Victron Battery Balancer?
- Helps series-connected batteries converge towards the same state of charge
- Suitable for 24V and 48V series battery-bank configurations
- Starts balancing when midpoint deviation exceeds 50mV
- Provides up to 0.7A balancing current
- LED indicators show power, active balancing and alarm status
- Normally-open alarm relay supports remote warning
- Over-temperature protection and low standby draw
How the Battery Balancer works
When the total charge voltage of a 24V battery system rises above 27.3V, the balancer compares the voltage of the two 12V battery sections. It draws current from the higher-voltage section so the batteries move towards an equal state of charge. The unit returns to standby when system voltage falls below 26.6V.
System compatibility
- 24V battery bank: one balancer for two 12V batteries connected in series
- 48V battery bank: three balancers for four 12V batteries connected in series
- Series-parallel banks: compatible with multiple parallel strings when wired according to Victron guidance
Battery chemistry, wiring, cable protection and charging settings must be compatible with the complete battery system. Confirm suitability with the battery manufacturer or installer, particularly for lithium systems.
Technical specifications
| Manufacturer | Victron Energy |
|---|---|
| Manufacturer part number | BBA000100100 |
| Input voltage range | Up to 18V per battery; 36V total |
| Turn-on voltage | 27.3V ±1% |
| Turn-off voltage | 26.6V ±1% |
| Balancing start threshold | 50mV midpoint deviation |
| Maximum balancing current | 0.7A when deviation exceeds 100mV |
| Alarm trigger | 200mV midpoint deviation |
| Alarm relay | 60V / 1A, normally open |
| Protection rating | IP22 |
| Operating temperature | -30°C to +50°C |
| Terminals | Screw terminals, 6mm² / AWG10 |
| Dimensions | 100 × 113 × 47mm |
| Weight | 0.4kg |
Installation
Mount the balancer vertically on a well-ventilated surface close to the batteries, but never directly above them where corrosive battery gases may collect. Use correctly sized wiring and DC protection. Installation should be completed or checked by a suitably qualified person.
Victron Battery Balancer FAQs
How many Battery Balancers do I need for a 24V bank?
One balancer is used with two series-connected 12V batteries forming a 24V bank.
How many do I need for a 48V bank?
Use three Battery Balancers across four series-connected 12V batteries.
Can Battery Balancers be connected in parallel?
Yes. Victron states that several balancers can be paralleled when more balancing capacity is required.
Is the Battery Balancer waterproof?
No. Its enclosure is rated IP22, so it should be installed in a dry, protected and ventilated location.
What does the red alarm light indicate?
The red LED and alarm relay activate when midpoint deviation exceeds 200mV. The alarm resets after deviation falls below 140mV or system voltage falls below 26.6V.
What is included: one Victron Battery Balancer. Battery cables, fuses and reset switch are not included unless stated separately.
