YKN-BMS4S Smart BMS Protection Board For Energy Storage/Street
light Battery Pack
The EcoLite YKN-BMS4S, a cutting-edge 4S Battery Management System
(BMS) engineered to optimize and protect 4-series lithium iron
phosphate (LiFePO4) battery packs. Built with an integrated
aluminum substrate, this BMS combines robust protection,
intelligent management, and versatile compatibility, making it a
premier choice for small energy storage systems, street lights, 12V
lead-acid replacement lithium batteries, and more.
| Products | Techincal Parameters |
| YKN-BMS4S(Bluetooth) | Basic Parameters |
 | Cell specifications | 4 series of lithium iron phosphate cells |
| Interface type | Charge and discharge are both at the same port |
| Charging Voltage | 14.6V |
| Cell voltage range | 8.8~15V |
| Continuous charging current | ≤200A |
| Continuous discharge current | ≤200A |
| Consumption of running | ≤25mA |
| Consumption of sleep | ≤300uA |
| Operating temperature | -30℃~75℃ |
| Size(L*W*H) | 200mm*100mm*20mm |
| Function configuration |
| Function | Configuration | Function | Configuration |
| Support serial number | 4S | 485 Communication(isolation) | Standard |
| Support continuous current | 200A | CAN Communication | Standard |
| NTC Quantity | 1 channels built-in
4 channels external | UART Communication | Optional |
| Equalization function | Passive equalization | BLE/WIFI | Standard |
| Battery packs used in parallel | Support | | |
| Data storage function | Standard | | |
| Buzzer alarm | Optional | | |
Key Advantages of This 4S BMS:
Enhanced Thermal Management with Aluminum Substrate: The integrated aluminum substrate ensures superior heat
dissipation, critical for maintaining stable performance during
high-current operation (up to 200A continuous charge/discharge).
This thermal efficiency extends the BMS’s lifespan and reliability,
even in harsh environments—ideal for outdoor or industrial
applications.
Comprehensive Protection Suite: Equipped with hardware-level safeguards, including overvoltage,
undervoltage, overcurrent, high/low temperature, and short-circuit
protection, this 4S BMS acts as a robust shield for your LiFePO4
battery packs, preventing damage and ensuring operational safety.
Intelligent Cell Balancing: Supports customizable balancing parameters (starting voltage,
voltage difference) with options for charge balancing or static
balancing. This feature ensures uniform cell voltage across the
4-series pack, maximizing capacity utilization and extending
battery cycle life.
Multi-Communication Capabilities: Standard support for Bluetooth, RS485, and CAN communication
enables real-time monitoring and data logging. Optional UART
communication further enhances integration flexibility for smart
systems.
Low Power Consumption: Automatically enters sleep mode during inactivity, reducing power
draw to ≤300µA—perfect for energy-sensitive applications like
street lights or backup storage.
Flexible Scalability: Supports series and parallel connection of battery packs,
allowing easy expansion to meet varying power demands.
Ideal Applications for YKN-BMS4S:
This 4S BMS is tailored for:
Small energy storage batteries (residential or commercial
mini-ESS).
LED street lights and outdoor lighting systems.
12V lead-acid replacement lithium batteries (for mobility scooters,
UPS, etc.).
Portable power stations and backup power units.
Low-voltage industrial equipment requiring stable battery
management.
Technical Specification of the 4S BMS:
Compatibility: 4-series LiFePO4 battery packs
Charge/Discharge: Shared port design | Continuous current: ≤200A (charge/discharge)
Voltage Parameters: Charging voltage 14.6V | Cell voltage range 8.8-15V
Temperature Management: 4-way cell temperature detection + 1-way power temperature
monitoring | Operating temp: -30℃~75℃
Communication: Standard Bluetooth, RS485, CAN | Optional UART
Power Consumption: Running: ≤25mA | Sleep: ≤300µA
Dimensions: 200mm100mm20mm (compact design for easy integration)
