Description
xVictron Energy Battery Balancer — BBA000100100
The Victron Energy Battery Balancer equalises the state of charge across two series-connected 12V lead-acid batteries in a 24V bank. It is designed for installers and system integrators working with off-grid, marine, and vehicle installations where uneven cell ageing or charging causes one battery to consistently over- or under-charge.
Key Features
- Balances two 12V batteries connected in series to form a 24V bank, preventing voltage divergence over time.
- Activates automatically when the 24V bank voltage exceeds 27.3V, drawing current from the higher-voltage battery to equalise both.
- Maximum balancing current of 1A, sufficient to correct typical charge imbalances in lead-acid batteries without stressing the cells.
- Compatible with all lead-acid battery types including flooded, AGM and gel chemistries.
- LED indicator shows when balancing is active, providing a simple visual confirmation of operation.
- Compact and lightweight at 0.34 kg, suitable for installation in confined spaces on boats, vehicles and off-grid cabinets.
- Can be used in parallel with additional Battery Balancers to manage larger series/parallel 24V battery banks.
Product Overview
When two 12V batteries are wired in series to create a 24V system, small differences in internal resistance, capacity and self-discharge rate cause the batteries to charge and discharge unevenly. Over time, one battery is repeatedly overcharged while the other is undercharged, accelerating degradation and shortening the life of the bank. The Battery Balancer addresses this directly by monitoring the mid-point voltage and diverting current from the higher-voltage battery to the lower-voltage one whenever the bank is being charged above 27.3V.
The balancing process is passive in the sense that it requires no manual intervention. Once wired in, the unit monitors continuously and activates only when needed. The 1A balancing current is deliberately modest: it is enough to correct the gradual drift that occurs in real-world installations without generating excessive heat or requiring additional thermal management. For larger battery banks made up of multiple series-parallel strings, two or more Battery Balancers can be deployed together to maintain balance across the full bank.
This product is specific to 24V lead-acid systems. It is not suitable for lithium battery chemistries, which manage cell balancing internally through a dedicated battery management system. Always verify battery chemistry and system voltage before specifying this unit.
Technical Specifications
| Parameter | Value |
| SKU | BBA000100100 |
| System Voltage | 24V (2 x 12V series) |
| Activation Voltage | 27.3V (24V bank) |
| Maximum Balancing Current | 1A |
| Compatible Battery Types | Lead-acid (flooded, AGM, gel) |
| LED Indicator | Yes (balancing active) |
| Weight | 0.34 kg |
| GTIN | 8719076020950 |
Applications
- Off-grid solar systems using a 24V lead-acid battery bank made up of two series-connected 12V batteries.
- Marine and narrowboat installations where 24V lead-acid banks are common and battery access for maintenance is limited.
- Vehicle and motorhome leisure battery systems wired at 24V.
- Telecoms and remote monitoring installations using 24V flooded or AGM battery backup.
- Any 24V lead-acid system where battery age, capacity mismatch or differing self-discharge rates are causing charge imbalance.
What Is Included
- 1 x Victron Energy Battery Balancer (BBA000100100)
Installation Notes
The Battery Balancer must be connected to the mid-point of a 24V series battery bank (the junction between the positive terminal of the lower battery and the negative terminal of the upper battery) as well as to the positive of the upper battery and the negative of the lower battery. Wiring should be carried out by a qualified electrician or experienced installer familiar with battery systems. Ensure the unit is used only with lead-acid batteries in a 24V configuration. Do not use with lithium batteries. For off-grid solar installations, a qualified installer should verify that the overall system design, including charge controller settings, is compatible with the balancer's activation threshold.
Return Policy
xWe offer a 14-day, no-quibble returns or replacement policy because we want you to be totally satisfied with your purchase.
If you are unhappy in any way with your purchase, you can return it for a refund or a replacement, as long as you return it in the same condition as it arrived (original/undamaged packaging and product) and within 30 days of receiving it. We will pay for your return postage on a faulty item as long as you send it using Royal Mail 2nd class recorded delivery (for EU or International Shipments, you have to use our UPS account, we will provide you with a return label)
Please keep in mind the following:
- Items returned within 14 days but not in their original and undamaged packaging will also incur a -15% charge per package.
- If you return an item that doesn't adhere to our returns procedure or doesn't include a returns form, you may be liable for a £10 administration fee
- Individual items from a bundle can't be returned, refunded or exchanged. If you want a refund/credit/exchange for a bundle, all items must be returned to us.
Before you return your item, please make sure that:
- You follow our returns process (outlined below)
- The goods and packaging are undamaged
IMPORTANT: We need to be able to identify an item with your order. We can only do this if you follow our returns process. Please do not send us items back that do not follow this process as they cannot be identified properly and will not be replaced or refunded.
What delivery method do I need to use when returning an item?
You must send the goods back to us via Royal Mail 2nd class recorded delivery. Refunds on faulty items returned are reimbursed within 5 working days.
Can I return just one item from multiple purchases?
Yes. Once you start the returns process you will go to a page that will allow you to choose which items you want to be replaced or refunded.
Returning faulty goods
If your item is faulty, you need to follow the returns policy, where you will be able to state that it’s faulty. The product will then arrive at our warehouse for testing.
If your purchase is not within 14 days
You can still exchange your item for a different product or for credit to use on the Voltacon Solar or Ledison-led-lights.co.uk websites (-15% from the credit amount).
Returns outside of the 14-day period do not qualify for the free returns policy.
Returning an item within the warranty
If you have a warranty and want to return a faulty item, you just need to follow our standard returns process. When we receive your item, we will then check that it’s within warranty and for any faults before arranging a replacement.