Seplos Smart 3.0 BMS User Manual

1. Introduction

The Seplos Smart 3.0 Battery Management System (BMS) is an advanced solution designed for LiFePO4 battery packs, supporting configurations from 7S to 16S and continuous charge/discharge currents up to 200A. It features comprehensive monitoring, protection, and communication capabilities, including CANBUS, RS485, and Bluetooth, enabling seamless integration with various inverters and remote management via a smartphone application. This manual provides essential information for the proper installation, operation, and maintenance of your Seplos Smart 3.0 BMS.

Figure 1: Seplos Smart 3.0 BMS main board and included components.

2. Key Features

• Battery Type Support: LiFePO4 (LFP) and NCM chemistries.
• Cell Configuration: Supports 7S, 8S, 13S, 14S, 15S, 16S series connections.
• Current Ratings: Available in 100A, 150A, and 200A continuous charge/discharge current versions.
• Communication Interfaces: CANBUS (default), RS485 (customizable), and Bluetooth for monitoring and control.
• Comprehensive Protection: Includes overcharge, over-discharge, overcurrent, short circuit, over-temperature, and under-temperature protection.
• Cell Balancing: Features a 2A passive balancing function to maintain cell voltage consistency.
• Pre-charging Function: Adjustable pre-charging time from 0-3000ms.
• Monitoring Capabilities: Real-time monitoring of total voltage, individual cell voltages, min/max cell voltage, environmental temperature, cell temperature, PCB temperature, state of charge (SOC), and current.
• Custom Functions: Heating function, external switch control, and RS485 protocol customization.
• Inverter Compatibility: Compatible with a wide range of inverters (refer to the compatibility list in Section 4.2).

3. Setup and Installation

Careful installation is crucial for the safe and efficient operation of the BMS. Ensure all connections are secure and correctly polarized.

3.1. Component Identification

Figure 2: Mainstream interface of BMS 3.0 with labeled components.

Refer to Figure 2 for the location of key components and interfaces on the BMS main board:

• MOSFETs: Charging MOSFET, Discharging MOSFET, Current Limiting MOSFET.
• Modules: Precharging module, Charging/Discharging Drive, Current Detecting Module, Power Supply Module, Bluetooth Module, Communication Module, Storage Module, MCU.
• Ports & Indicators: CAPACITY, ALM (Alarm), RUN, ADS, RESET, CAN/RS485, RS4851, RS4852.
• Voltage/Temperature Detecting Module: Connects to cell voltage and temperature sensors.

3.2. BMS Type Selection

The Seplos Smart 3.0 BMS is available in different configurations for communication ports:

Figure 3: BMS 3.0 Types A, B, and C.

• Type A: Features integrated communication ports and indicator lights directly on the BMS main board.
• Type B: Comes with a split communication board and a separate light board.
• Type C: Includes a split communication board and a split light board.

Ensure you have the correct type for your application and connect the respective boards as per the provided wiring diagrams (if applicable to your specific model).

3.3. Wiring Connections

1. Cell Voltage Connections: Connect the individual cell voltage detection wires from your battery pack to the BMS. Ensure correct polarity and sequence (B- to B+ for each cell).
2. Temperature Sensor Connections: Connect the temperature sensors to the designated ports on the BMS.
3. Main Power Connections: Connect the main battery positive (B+) and negative (B-) terminals to the appropriate high-current terminals on the BMS.
4. Load/Charger Connections: Connect your load and charger to the designated output terminals (P- for common port BMS).
5. Communication Connections: Connect CANBUS or RS485 cables to your inverter or other communication devices. For Bluetooth, ensure the module is connected (if not integrated).

Important: When connecting the BMS to a computer for parameter monitoring, use a Seplos RS485 to USB Adapter. Generic adapters from the market may not function correctly due to hardware definition differences.

Figure 4: Seplos RS485 to USB Adapter.

4. Operation

4.1. Monitoring and Control

The Seplos Smart 3.0 BMS allows for comprehensive monitoring of your battery system:

• Voltage: View total battery voltage, individual cell voltages, and identify minimum and maximum cell voltages.
• Temperature: Monitor ambient temperature, individual cell temperatures, and the temperature of the BMS PCB.
• State of Charge (SOC): Track the current charge level of your battery pack.
• Current: Observe the current flowing into or out of the battery.

These parameters can be accessed via the smartphone app (Apple/Android) or PC software.

Figure 5: Bluetooth Communication via Smartphone App.

The Bluetooth communication feature supports both Apple and Android systems and is available in Chinese and English. It allows you to view PACK data and switch communication protocols directly from your mobile device.

4.2. Inverter Communication

The BMS 3.0 is designed to communicate with a wide range of inverters using CANBUS (default) or RS485 protocols. The system supports parallel operation of up to 16 BMS units.

Figure 6: Compatible Inverters and App Interface.

Figure 7: Seplos 3.0 BMS Compatible Inverter List.

For detailed inverter compatibility and settings, refer to Figure 7. The list specifies brands, Windows software settings (Pylon_CAN, Growatt_CAN, Sofar_CAN, SMA_CAN, Victron_CAN, Studer_CAN, Ginlong_CAN, Voltronic_485, SRNE_485, Deye_485), and corresponding LCD settings.

4.3. Software Interfaces

The Seplos BMS 3.0 uses specific software for monitoring and configuration:

Figure 8: BMS Software Interfaces.

• BATTERYSTUDIO: Compatible with BMS 3.0 only.
• BATTERYMONITOR: Compatible with BMS 2.0 only.

Note: BMS 2.0 and BMS 3.0 cannot be used in parallel.

5. Maintenance

5.1. Cell Balancing

The BMS features a 2A passive balancing function to ensure all cells in the battery pack maintain similar voltage levels, prolonging battery life and performance. This process is automatic.

Figure 9: 2A Active Balance Board.

5.2. Heating Function

If the heating function is enabled, the BMS will automatically manage battery temperature. The heating function starts at 0℃ and stops at 10℃ to ensure optimal battery performance in cold environments.

5.3. General Care

• Keep the BMS and battery pack within the specified working temperature range (-20℃ to 70℃).
• Ensure proper ventilation around the BMS to prevent overheating.
• Regularly check all wiring connections for tightness and signs of wear or corrosion.

6. Troubleshooting

The BMS incorporates various protection mechanisms to safeguard the battery. Understanding these can help diagnose issues.

• Short Circuit Protection: If a continuous short circuit occurs in the output, the BMS will lock after 5 instances of protection. To release the lock, connect the battery pack to a charger.
• Over/Under Voltage Protection: The BMS will disconnect the battery if individual cell or total pack voltage exceeds or falls below safe thresholds. Check cell voltages and charging/discharging conditions.
• Overcurrent Protection: If the charge or discharge current exceeds the set limits, the BMS will activate protection. Reduce the load or charging current.
• Temperature Protection: The BMS will protect the battery from extreme temperatures (both high and low). Ensure the battery operates within its recommended temperature range.
• Communication Issues: If experiencing problems with PC monitoring, ensure you are using the official Seplos RS485 to USB Adapter, as third-party adapters may have incompatible hardware definitions.

7. Specifications

8. User Tips

• Always double-check wiring connections before powering on the system to prevent damage to the BMS or battery.
• For optimal performance and longevity, ensure your battery pack is properly balanced. The 2A passive balancer helps, but initial balancing of cells is recommended.
• When using the PC software for monitoring, ensure you have the correct version (BATTERYSTUDIO for BMS 3.0).
• If you plan to use RS485 communication with a computer, it is highly recommended to purchase the dedicated Seplos RS485 to USB Adapter to avoid compatibility issues.
• Keep the BMS firmware updated to benefit from the latest features and bug fixes.

9. Warranty and Support

For any technical assistance, warranty claims, or support inquiries, please contact the Seplos Store directly. Ensure you provide your purchase details and a clear description of the issue to facilitate prompt support.

The BMS is designed for energy storage applications, home energy storage, and DIY battery packs. For application examples, refer to Figure 10.

Figure 10: Application Area of Seplos Smart 3.0 BMS.