Automatic 12V Battery Equaliser – Extend the lifespan of your batteries in 24V, 36V, and 48V systems
A single weak battery in a series string can drag down the performance of your entire system. It discharges faster, charges less efficiently, and eventually degrades the health of the surrounding cells. This automatic 12V battery equaliser solves this issue by continuously redistributing energy across your battery bank without any manual intervention. It works around the clock, whether your system is charging or discharging.
Note: The price is for a single equaliser unit. For 36V systems, 2 units are required, and for 48V systems, 3 units are required.
Why choose this model? (Key Benefits):
- Rapid response to imbalance — automatically activates when the voltage difference exceeds 20mV, addressing issues before they become problematic.
- 0–5A adjustable balancing current — adapts to the size of your battery bank, ensuring efficient energy transfer without unnecessary waste.
- Ultra-low <3mA standby consumption — consumes less power than an LED; ideal for solar and UPS setups where every Watt-hour counts.
- Compatible with Gel, AGM, and Lead-Acid — works with any standard 12V battery, regardless of the manufacturer.
- Automatic 10V low-voltage disconnect — protects the most discharged battery from irreversible cell damage.
- Reverse polarity protection — prevents damage to the device or your batteries if connections are made incorrectly.
- Compact 70×70×27 mm design — easily fits into tight control panels or battery boxes with limited space.
Details and Performance
The principle is simple, but the long-term impact is significant. This 12V battery equaliser constantly monitors the voltage of each battery in the series. As soon as it detects a difference greater than 20mV, it transfers current from the battery with the higher voltage to the one with the lower voltage. No manual settings or adjustments are required.
This device is perfectly suited for solar PV systems, UPS units, electric vehicles, and any industrial or residential setup using batteries in series. With a standby consumption of less than 3mA, it adds no significant load to your system. The wiring diagram is available in the photo gallery, and installation takes just a few minutes.
| Parameter | Value / Detail |
|---|---|
| Nominal voltage per battery | 12V |
| Compatible systems | 24V / 36V / 48V (12V batteries in series) |
| Balancing current | 0 – 5A |
| Activation threshold | Voltage difference > 20mV |
| Standby consumption | < 3mA |
| Low-voltage disconnect | 10V |
| Reverse polarity protection | Yes |
| Compatible battery types | Gel, AGM, Lead-Acid |
| Dimensions | 70 x 70 x 27 mm |
Package Contents
- 1 x 12V Battery Equaliser (for one pair of adjacent batteries)
- Wiring diagram (available in the photo gallery)
Frequently Asked Questions
How many equalisers do I need for a 48V system?
For 4 batteries of 12V in series (48V total), you need 3 equalisers—one between each adjacent pair. For 36V systems, 2 units are required, and for 24V, a single unit is sufficient.
Does it work during charging, or only during discharge?
Yes, the equaliser works continuously—both during charging and discharging. There is no need to manually switch it on or off.
Is it compatible with Gel or AGM batteries, or only standard wet-cell batteries?
It works with all standard 12V battery types: Gel, AGM, and flooded Lead-Acid. It is not compatible with Lithium-Ion or LiFePO4 batteries.
What happens if a battery voltage drops below 10V?
The equaliser automatically disconnects from that specific battery to prevent deep discharge, which is one of the most common causes of permanent cell degradation.
Is installation complicated? Do I need an electrician?
No. The diagram in the photo gallery shows exactly how to connect the equaliser in parallel with each battery. If you have experience connecting terminals and cables to batteries, you can complete the installation yourself in just a few minutes.
Photo Gallery
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