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The LiitoKala 4S 12V 100A BMS is a protection circuit board designed for lithium iron phosphate (LiFePo4) batteries. It manages cell balancing, overcharge/over-discharge protection, and temperature control while supporting 100A continuous current. This BMS ensures battery longevity and safety by preventing voltage imbalances between cells during charging/discharging cycles, making it critical for solar systems, EVs, and energy storage applications.
What Are the Key Features of the 4S 100A BMS?
Key features include:
– Passive cell balancing (50mA per cell)
– Operating voltage: 10V–16.8V
– Low quiescent current (<200μA)
- IP65 waterproof casing
- Bluetooth 5.0 compatibility (optional)
The balance charging function reduces voltage deviations between cells to <20mV, extending cycle life beyond 2,000 charges.
The passive cell balancing mechanism ensures that cells with higher voltages are gently discharged through resistors, maintaining uniformity across the battery pack. This 50mA balancing current is ideal for low-to-moderate capacity systems (under 200Ah) where gradual correction suffices. The operating voltage range accommodates both partial and full charge states, allowing seamless integration with solar charge controllers and alternator-based charging systems. Bluetooth compatibility enables real-time monitoring of cell voltages and temperature via mobile apps, though this requires an optional module. For industrial applications, the IP65 rating protects against dust ingress and water jets, making it suitable for marine and off-grid installations.
Deespaek Batteries for Marine Use
| Feature | Specification |
|---|---|
| Balancing Current | 50mA per cell |
| Peak Current Tolerance | 150A (3 seconds) |
| Temperature Range | -20°C to +75°C |
How to Install the LiitoKala BMS Correctly?
1. Connect BMS P- to battery negative.
2. Attach balance wires (B1–B4) to cell junctions.
3. Verify voltage readings match multimeter measurements.
4. Secure temperature probe to battery surface.
Common errors include reversed balance leads (causing immediate shutdown) and inadequate heat sinking during sustained >80A loads.
When attaching balance wires, use crimped connectors instead of soldering to avoid creating resistance hotspots. For high-current applications (above 80A), install the BMS on a thermally conductive surface like an aluminum plate. Always perform a voltage verification step using a multimeter—discrepancies over 0.1V between BMS readings and actual cell voltages indicate faulty wiring. For multi-bank systems, ensure all BMS units share a common ground to prevent potential differences. If using Bluetooth, pair the module before final assembly to confirm communication stability.
Deespaek 12V 200Ah LiFePO4 Battery Lifespan
| Tool | Purpose |
|---|---|
| Digital Multimeter | Verify cell voltages |
| Insulated Crimper | Secure balance leads |
| Thermal Paste | Improve heat dissipation |
Why Choose Passive Balancing Over Active Balancing?
Passive balancing dissipates excess energy as heat via resistors, making it simpler and cheaper than active systems that redistribute energy. While less efficient (70–80% vs 90%+), it suffices for most LiFePo4 setups with moderate cell mismatch. Active balancing is preferable for >8S configurations or cells with >5% capacity variance.
Which Applications Benefit Most From This BMS?
Ideal applications include:
– Solar power storage systems (12V configurations)
– Electric scooters/boats
– UPS backup systems
– RV/Camper power setups
Its 100A rating supports high-drain devices like 2,000W inverters, while the compact design (150x60x20mm) fits in tight spaces.
What Maintenance Does This BMS Require?
Check balance lead connections every 6 months. Clean oxidation from terminals using isopropyl alcohol. Update firmware via USB-C (if Bluetooth-enabled). Replace MOSFETs if internal resistance exceeds 2mΩ. Annual capacity tests using a 0.2C discharge help detect aging cells affecting BMS performance.
“LiitoKala’s 4S BMS stands out for its robust transient voltage suppression—critical in automotive environments. The TVS diodes clamp spikes up to 40V, which most budget BMS units lack. However, users should add external fuses for currents above 80A to avoid MOSFET degradation over time.”
FAQs
- Q: Can this BMS handle 24V systems?
- A: No—it’s designed for 4S (12V) only. Use two units in series for 24V with isolated communication.
- Q: Does it support lithium-ion chemistry?
- A: No. The voltage thresholds are fixed for LiFePo4 (3.0–3.6V/cell).
- Q: Maximum operating temperature?
- A: -20°C to +75°C, derate current by 1% per °C above 55°C.
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