The NEEY Active Equalizer Balancer 5A optimizes 3-4S LiFePO4/LTO/LiPo battery packs by redistributing energy between cells, ensuring voltage uniformity. This minimizes capacity loss, extends cycle life, and prevents overcharging/over-discharging. With a 5A balancing current, it rapidly corrects imbalances, making it ideal for EVs, solar storage, and high-demand applications. Its compatibility with multiple chemistries adds versatility.
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How Does the NEEY Active Balancer Work?
The balancer uses active energy transfer technology to shift excess charge from higher-voltage cells to lower-voltage ones via inductors. This method operates at 85% efficiency, reducing heat generation compared to passive systems. Real-time monitoring detects deviations as small as 10mV, triggering instant correction. The 5A current capacity enables rapid balancing even in large-capacity packs (100Ah+).
This system employs a four-stage balancing process: detection, analysis, energy redistribution, and verification. High-frequency switching (up to 2MHz) allows precise charge transfers without voltage spikes. The dual-layer PCB design minimizes electromagnetic interference while handling peak currents of 7.2A. Unlike passive balancers that waste energy through resistors, this active system reallocates 92% of excess energy between cells. Field tests demonstrate it can reduce voltage differentials from 300mV to under 20mV within 45 minutes in a 4S 280Ah LiFePO4 bank during charging cycles.
Which Battery Chemistries Are Compatible?
Designed for 3-4S configurations, it supports LiFePO4 (2.5–3.65V/cell), LTO (1.5–2.8V/cell), and LiPo (3.0–4.25V/cell). Voltage ranges are auto-detected, eliminating manual configuration. The balancer accommodates mixed chemistry setups, provided total pack voltage stays within 6–16.8V. Titanium oxide capacitors handle rapid charge transfers without degradation.
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| Chemistry | Cell Voltage Range | Max Pack Voltage |
|---|---|---|
| LiFePO4 | 2.5-3.65V | 14.6V (4S) |
| LTO | 1.5-2.8V | 11.2V (4S) |
| LiPo | 3.0-4.25V | 16.8V (4S) |
What Are the Key Advantages Over Passive Balancers?
Active balancing preserves 15–20% more capacity than passive methods by recycling energy instead of dissipating it as heat. It operates during charging/discharging/idle phases, while passive systems only activate near full charge. The 5A current outperforms typical 0.5–2A passive solutions, reducing balancing time by 70% in 200Ah industrial batteries.
What Safety Protections Are Included?
The device features reverse polarity protection (±30V tolerance), over-temperature shutdown (85°C), and transient voltage suppression (TVS) up to 40V. A fail-safe relay disconnects during BMS faults. Insulated nickel-plated copper terminals prevent arcing. Conformal coating on PCBs resists humidity and chemical corrosion.
Advanced protection mechanisms include redundant voltage sensing paths and a watchdog timer that resets the microcontroller if communication errors occur. The balancer’s housing meets IP67 standards when properly installed, with silicone-sealed cable entries preventing moisture ingress. Spark-proof terminals eliminate ignition risks in flammable environments. During extreme overvoltage events (up to 45V for 500ms), the TVS diodes shunt excess energy while the relay opens within 12 milliseconds.
“The NEEY 5A represents a paradigm shift in mid-price battery management. Its use of GaN FETs enables 92% energy transfer efficiency – a 14% improvement over previous models. For fleets using LTO batteries in cold climates, this balancer mitigates the voltage slump issues that plague passive systems at -20°C.”
– Senior Engineer, EV Battery Solutions Inc.
- Does It Work With 2S Battery Packs?
- No – the minimum configuration is 3S (3 cells in series). For 2S systems, consider NEEY’s 2S-6S model with adjustable current.
- What’s the Standby Power Consumption?
- 0.8W in monitoring mode, rising to 25W during active balancing. Does not require external power – operates from battery voltage.
- Is Calibration Required for Different Chemistries?
- No – the auto-detection algorithm adjusts voltage parameters within 15 seconds of connection. Manual override available via USB-C interface.