DALY Smart BMS 48V LiFePO4 120A 15S Instruction Manual

1. Introduction and Overview

The DALY Smart BMS (Battery Management System) is a programmable protection board designed for 48V LiFePO4 15S lithium battery packs. This system provides essential protection and management functions to optimize battery performance, ensure safety, and extend the battery's lifespan. It is suitable for various applications including energy storage, electric vehicles, electric tools, and more.

Image 1.1: Overview of the DALY Smart BMS unit with main terminals and communication ports.

2. Safety Information

Please read and understand all safety instructions before installation and operation. Failure to follow these instructions may result in electric shock, fire, or serious injury.

• Always disconnect the battery pack from any power source before performing installation, wiring, or maintenance.
• Ensure correct wiring polarity and connections to prevent damage to the BMS, battery pack, or connected equipment.
• Working with high-voltage battery systems can be dangerous. If you are unsure about any part of the installation or operation, consult a qualified professional.
• Avoid short-circuiting the battery terminals or BMS connections.
• Do not expose the BMS to extreme temperatures, moisture, or corrosive environments.

3. Package Contents

Verify that all items are present in the package:

• 3.2V LiFePO4 BMS (1 unit)
• Bluetooth Module (1 unit)
• NTC Sensor (1 unit)
• Sampling Cable (1 unit)
• UART Cable (1 unit)
• Instruction Manual (1 unit)

Image 3.1: Contents included in the DALY Smart BMS package.

4. Product Features

The DALY Smart BMS offers a range of features designed for robust battery management:

• Comprehensive Protection: Includes overcurrent, overcharge, overdischarge, short circuit, and temperature protection to safeguard your battery pack.
• Enhanced Durability: Features double protection through injection patent technology and a patent shell, making it waterproof, dustproof, shockproof, and anti-static.
• High-Quality Components: Constructed with pressure-resistant and durable materials, ensuring high acquisition accuracy and reliability.
• Smart Monitoring: Allows users to check battery status and modify parameters at any time via a Bluetooth app or PC software.
• Quality Assurance: ISO, FCC, RoHS, PSE, and CE approved for guaranteed quality and safety standards.

5. Setup and Installation

Careful installation is crucial for the proper functioning of the BMS. Follow these steps:

5.1 Tools Required

• Soldering machine (recommended temperature: 662°F/350°C)
• Scissors
• Double-sided tape
• Tin wire
• Multimeter

5.2 Wiring Instructions

1. Disconnect Power: Before any wiring, ensure all balance wires are disconnected from the battery pack and the BMS connection port.
2. Weld Main Wires: Carefully weld the black (B-) and red (P-) main wires to the battery pack. Refer to the wiring diagram below for correct connections.
3. Connect Balance Wires: After welding the main wires, connect the balance wires to the battery cells. Ensure each balance wire is connected to its corresponding cell voltage tap.
4. Connect BMS Port: Once all balance wires are correctly welded and connected to the battery cells, connect the balance wire harness to the BMS connection port.
5. Install Accessories: Install communication accessories such as the UART/Bluetooth module, RS485, or CAN module to the BMS.
6. Positioning: Keep the red cooling surface side of the BMS uncovered to ensure proper heat dissipation. Use DALY matching balance wires (regular length 450 mm / 17.72 inch).

Image 5.1: Detailed wiring diagram for connecting the DALY Smart BMS to a LiFePO4 battery pack, motor, and charger.

5.3 BMS Activation

The BMS can be activated using one of two methods:

• Method 1: Press the activation button located on the battery board.
• Method 2: Connect the battery pack to a charger to activate the BMS for the first time.

5.4 Initial Setup and Parameter Configuration

The BMS comes with default protection parameters for Li-ion/LiFePO4 batteries. However, it is essential to set the actual capacity (AH) of your battery pack using the Bluetooth app or PC software. Incorrect capacity settings will lead to inaccurate remaining power percentage readings. Other parameters can also be adjusted as needed.

The initial password for the smart board APP to change parameters is: 123456.

6. Operating Instructions

The DALY Smart BMS allows for convenient monitoring and parameter adjustment via a dedicated Bluetooth app or PC software.

6.1 Bluetooth App / PC Software Connection

Connect the provided Bluetooth module or UART cable to the BMS. Use the corresponding app on your smartphone or software on your PC to establish a connection. This allows you to:

• Monitor real-time battery status (voltage, current, temperature, state of charge).
• View individual cell voltages.
• Adjust protection parameters (e.g., overcharge/overdischarge voltage, current limits).
• Set the battery pack's capacity (AH) for accurate state of charge readings.

Image 6.1: The DALY Smart BMS connected via Bluetooth to a smartphone app, displaying battery status and parameters.

Image 6.2: Illustration of the UART and Bluetooth communication ports on the DALY Smart BMS for connecting to external devices.

7. Maintenance

To ensure the longevity and optimal performance of your DALY Smart BMS:

• Keep Cooling Surface Clear: Always ensure the red cooling surface of the BMS is uncovered and free from obstructions to allow for efficient heat dissipation.
• Regular Inspection: Periodically inspect all wiring connections for tightness and signs of corrosion or damage.
• Cleanliness: Keep the BMS unit clean and free from dust and debris. Use a dry, soft cloth for cleaning.
• Environmental Conditions: Operate the BMS within its specified temperature and humidity ranges.

8. Troubleshooting

If you encounter issues with your DALY Smart BMS, consider the following troubleshooting steps:

• BMS Not Activating: If the BMS does not activate after initial connection, try pressing the activation button on the board or connecting the battery pack to a charger.
• No Power Output: Check all main power connections (B- and P-) for secure contact and correct polarity. Verify that the battery pack itself is charged.
• Communication Issues: Ensure the Bluetooth module or UART cable is correctly connected to the BMS and your device. Restart the app/software and try reconnecting. Check device Bluetooth settings.
• Inaccurate Readings: Confirm that the battery pack capacity (AH) has been correctly set in the BMS app/software.
• Over-Protection Triggered: If the BMS is frequently triggering protection (e.g., overcurrent, overvoltage), review your system's load and charging parameters. Consult the app/software for specific fault codes or warnings.
• Balance Issues: Ensure all balance wires are correctly connected to their respective cell voltage taps.

For further assistance, refer to the support section or contact customer service.

9. Specifications

Key technical specifications for the DALY Smart BMS 48V LiFePO4 120A 15S:

Image 9.1: Detailed specifications table for the DALY Smart BMS.

10. Warranty and Support

DALY Electronics is committed to providing high-quality products and customer satisfaction.

• Customer Service: We offer 24-hour one-on-one customer service to assist with any inquiries or issues you may encounter.
• Technical Support: Lifetime technical support is provided for all DALY BMS products, ensuring long-term assistance for your battery management needs.
• Contact: If you require active balancers, parallel modules, or other accessories, or need a customized BMS or bulk order, please contact our online customer service.