DALY Smart Active Balance BMS 200A 4S-8S User Manual

1. Product Overview

The DALY Smart Active Balance BMS (Battery Management System) is designed to protect and manage Li-ion, LiFePO4, and LTO battery packs. This model supports 4 to 8 series cells (4S-8S) with a voltage range of 12V-24V and a continuous charge/discharge current of 200A. It features an integrated 1A active balancing function and multiple communication interfaces including Bluetooth, RS485, and CAN.

Image 1.1: DALY Smart Active Balance BMS (Model R24TM-200A) and its components.

Key Features:

• Cell Compatibility: Supports 4S-8S Li-ion, LiFePO4, and LTO battery packs.
• Current Rating: 200A continuous charge and discharge current.
• Active Balancing: Integrated 1A active balance for cell voltage equalization.
• Smart Monitoring: Built-in Bluetooth for real-time monitoring of cell voltages, temperatures, and other parameters via a mobile application.
• Communication Interfaces: Includes RS485 and CAN for advanced system integration.
• Protection Functions: Overcharge, over-discharge, overcurrent, short circuit, and high-temperature protection.

Image 1.2: Summary of BMS specifications including battery strings, current, balance current, function, battery type, and communication.

2. Setup and Installation

Proper installation is critical for the safe and effective operation of the BMS. Ensure all connections are made in the specified order to prevent damage to the BMS or battery pack.

2.1 Packing List

Verify that all components are present before beginning installation:

• Smart Active Balance BMS unit
• P-&-B- cable (Power and Battery Negative cables)
• Screws (2 Pcs)
• Sampling cable (Balance wires)
• B+ cable (Battery Positive cable)
• NTC (Temperature sensor, one standard, two optional)
• User Manual (this document)
• Packaging box
• RS485/CAN port cable (if applicable to your model)

Image 2.1: Illustrated packing list for the DALY BMS.

2.2 Wiring Instructions

Follow these steps carefully for correct wiring:

1. Pre-charge Connection: Connect the pre-charge circuit if your system requires it. This helps to limit inrush current when connecting the main battery.


Image 2.2: Pre-charge connection diagram.

2. Cell Voltage Sensing Wires: Connect the balance wires (sampling cable) to each cell of the battery pack, starting from the lowest voltage cell (B-) to the highest (B+). Ensure the order is correct.


Image 2.3: Cell voltage sensing wire connection.

3. Main Power Connections: Connect the main B- (battery negative) and P- (load/charge negative) cables to the BMS. Then connect the main B+ (battery positive) cable.


Image 2.4: Main power connection diagram.

4. Parallel Battery Pack Configuration: If using multiple battery packs in parallel, ensure each pack has its own BMS and follow the manufacturer's guidelines for parallel connection.


Image 2.5: Parallel battery pack connection example.

A general wiring diagram is provided below for reference. Always consult the specific diagram included with your product for precise connections.

Image 2.6: Comprehensive wiring diagram for the BMS, showing connections for B+, B-, P-, and communication ports.

3. Operating Instructions

The DALY Smart Active Balance BMS offers intelligent monitoring and control capabilities through its communication interfaces.

3.1 Mobile Application Monitoring

The BMS features built-in Bluetooth for wireless monitoring via a dedicated mobile application. Download the 'BalanceBMS' app from your device's app store (available on iOS and Android).

• Connection: Once the BMS is powered, open the 'BalanceBMS' app and search for available Bluetooth devices. Select your BMS to connect.
• Monitoring: The app displays real-time data including individual cell voltages, total pack voltage, charge/discharge current, temperature, and State of Charge (SOC).
• Settings: The app allows for adjustment of various BMS parameters, such as over-voltage, under-voltage, and overcurrent thresholds.

3.2 PC Host and Other Communication

For advanced monitoring and configuration, the BMS supports UART, RS485, and CAN communication protocols. These interfaces allow connection to a PC host or other external modules.

• UART: Connect a USB-UART adapter to the BMS UART port for PC communication. Specific software is required for this interface.
• RS485/CAN: These ports enable integration into larger systems, such as industrial controls or vehicle networks. Consult the technical documentation for protocol details.
• Optional Modules: The BMS can be extended with optional modules like WiFi for cloud monitoring, GPS, key switches, buzzers, and heating modules.

Image 3.1: Multi-channel communication options including PC Host (CAN, RS485, UART), Mobile APP (Bluetooth, WiFi module), GPS module, Key switch, Buzzer, Heating Module, and Temperature control.

4. Maintenance

The DALY Smart Active Balance BMS is designed for minimal maintenance. Its active balancing feature helps maintain cell health, and its protection functions safeguard the battery.

• Regular Monitoring: Periodically check the battery parameters via the mobile app or PC software to ensure all cells are within healthy voltage and temperature ranges.
• Firmware Updates: Check the manufacturer's website or app for any available firmware updates to ensure optimal performance and access to new features.
• Physical Inspection: Occasionally inspect the BMS and wiring for any signs of damage, loose connections, or corrosion. Ensure the cooling fan (if present) is free from obstructions.
• Cleaning: Keep the BMS unit clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquids or abrasive cleaners.

5. Troubleshooting

This section addresses common issues and their potential solutions.

5.1 General Issues

• BMS Not Powering On:
  • Verify all main power connections (B-, P-, B+) are secure and correctly wired.
  • Check the battery pack voltage to ensure it is within the operational range (12V-24V for 4S-8S).
• No Bluetooth Connection:
  • Ensure the BMS is powered on.
  • Confirm Bluetooth is enabled on your mobile device.
  • Restart the 'BalanceBMS' app and try reconnecting.
  • Ensure your device is within close proximity to the BMS.
• Incorrect Readings in App:
  • Double-check all cell voltage sensing wires for correct order and secure connections. A multimeter can be used to verify individual cell voltages.
  • Ensure the app is configured for the correct number of series cells (S-count).

5.2 Protection Triggers

If the BMS enters a protection state (e.g., no output, no charge), identify the cause:

• Overcharge/Over-discharge Protection: The BMS will cut off charging/discharging if cell voltages exceed or fall below set thresholds. Check charger voltage and battery health.
• Overcurrent Protection: Occurs if the load draws too much current. Reduce the load or ensure the BMS current rating matches your application.
• Short Circuit Protection: The BMS will immediately cut off output in case of a short circuit. Identify and remove the short.
• High Temperature Protection: If the BMS or battery temperature exceeds safe limits, the BMS will shut down. Ensure adequate ventilation and cooling.

5.3 Compatibility Warning

Warning: Using a BMS with an incompatible battery type or cell count can lead to severe damage to both the battery and the BMS, potentially causing fire or explosion. Always ensure your BMS matches your battery pack's specifications (e.g., Li-ion, LiFePO4, LTO, and S-count).

Image 5.1: Guide for selecting the appropriate BMS based on battery cell type, series count, and ampere requirements.

6. Specifications

Image 6.1: Overview of DALY BMS specifications for various current ratings, including the 200A model.

7. Warranty and Support

7.1 Warranty Information

This DALY Smart Active Balance BMS comes with an 18-month warranty from the date of purchase. The warranty covers defects in materials and workmanship under normal use. It does not cover damage caused by improper installation, misuse, accidents, unauthorized modifications, or natural disasters.

7.2 Customer Support

For technical assistance, troubleshooting, or warranty claims, please contact DALY customer service. Refer to the product packaging or the official DALY website for the most current contact information.

The 'BalanceBMS' mobile application also provides a channel for support and information regarding your BMS.