DALY BMS 24S 72V 100A LiFePO4 Battery Protection Module User Manual

1. Introduction

1.1 Product Overview

The DALY BMS (Battery Management System) is designed to protect 24-series 72V LiFePO4 battery packs, supporting a continuous discharge current of 100A. This module ensures optimal performance and extends the lifespan of your battery by providing essential protection features.

Key features include:

• Overcurrent Protection
• Overcharge Protection
• Overdischarge Protection
• Short Circuit Protection
• Temperature Protection
• Integrated balance leads for cell voltage equalization.

The robust design incorporates injection patent technology and a patent shell, offering waterproof, dustproof, shockproof, and anti-static properties. High-quality components ensure pressure resistance and durability.

1.2 Package Contents

Verify that all items are present in your package:

• DALY 3.2V LiFePO4 BMS (1 unit)
• NTC Sensor (1 unit)
• Sampling Cable (1 unit)
• Instruction Manual (1 unit)

Figure 1: Example of package contents including the BMS unit, cables, and manual.

2. Safety Information

Read all safety warnings and instructions carefully before installation and operation. Failure to follow these instructions may result in electric shock, fire, or serious injury.

• Always wear appropriate personal protective equipment (PPE), including safety glasses and insulated gloves, when working with batteries.
• Ensure the battery pack is disconnected from any power source before installing or servicing the BMS.
• Verify correct polarity for all connections. Incorrect wiring can damage the BMS, battery, or connected equipment, and poses a fire risk.
• Do not short-circuit the battery terminals or BMS connections.
• Keep the BMS and battery pack away from water, moisture, and flammable materials.
• Do not attempt to open, modify, or repair the BMS. Refer servicing to qualified personnel.
• Ensure adequate ventilation around the battery pack and BMS during operation.
• The sampling cable must be connected correctly and in sequence. Connecting the sampling cable incorrectly can damage the BMS.

3. Setup and Installation

3.1 Wiring Diagram

The following diagram illustrates the common port wiring for the DALY BMS. Ensure all connections are made accurately according to this diagram.

Figure 2: Common port wiring diagram for the DALY BMS. This diagram shows connections for the motor load, charger, and battery cells, along with sampling wires.

3.2 Connection Sequence

Follow these steps carefully to connect the protection board and battery:

1. Important: The cables of different manufacturers are not universal. Please ensure to use the supporting cables provided with your DALY BMS. When welding the sampling cable, the cable shall not be inserted into the BMS until all welding is complete.
2. The sampling line is connected from the thin black line to the total negative electrode B-. The second line (red line) is connected to the positive electrode of the first string of batteries, followed by the positive electrode of each string of batteries until the last string of total positive electrode B+.
3. After the cable is connected, the plug should not be directly inserted into the BMS. First, measure the voltage between each two adjacent metal terminals on the back of the plug. In the case of Li-ion battery, the voltage should be between 3.0 ~ 4.15V. For LiFePO4 battery, the voltage should be between 2.5 ~ 3.6V. For LTO battery, it should be between 1.8 ~ 2.8V. Please ensure that the voltage is correct before proceeding to the next step.
4. Connect the B- wire (blue thick wire) of the protection plate to the negative pole of the battery.
5. Insert the cable into the BMS.

After wiring:

6. Please measure whether the battery B+, B-voltage and B+, P-voltage are equal (i.e., whether the voltage of the battery pack itself is equal to the voltage after passing through the protection board). Equal means that the BMS can be used normally. If not, please recheck according to the above wiring sequence.
7. The positive electrodes of the charge and discharge terminals are directly connected to the total positive electrode B+ of the battery.
8. The wiring method of the common port BMS is that the negative electrodes of charge and discharge are connected at the P- of the protection board.

For additional visual guidance, you may refer to the official website's picture tutorial: DALY Electronics Wiring Tutorial

4. Operating Instructions

Once the DALY BMS is correctly installed and connected to your LiFePO4 battery pack, it operates automatically to provide continuous protection. This standard BMS model does not feature communication functions (e.g., Bluetooth, RS485, CAN).

• Automatic Protection: The BMS continuously monitors cell voltage, current, and temperature. It will automatically cut off charge or discharge if any parameter exceeds safe limits (overcharge, overdischarge, overcurrent, short circuit, or over-temperature).
• Balance Function: The integrated balance leads help equalize the voltage across individual battery cells, promoting longer battery life and better performance.
• Normal Operation: When all parameters are within safe operating ranges, the BMS allows normal charging and discharging of the battery pack.

5. Maintenance

The DALY BMS is designed for durability and requires minimal maintenance. However, periodic checks can help ensure its longevity and reliable operation:

• Visual Inspection: Periodically inspect the BMS and all wiring for any signs of damage, corrosion, or loose connections.
• Cleanliness: Keep the BMS free from dust and debris. Use a soft, dry cloth for cleaning. Do not use liquids or abrasive cleaners.
• Environmental Conditions: Ensure the BMS operates within its specified temperature and humidity ranges to prevent premature failure.
• Connection Integrity: Verify that the sampling cable and main power cables remain securely connected.

6. Troubleshooting

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

If the problem persists after attempting these solutions, please contact DALY customer service for further assistance.

7. Specifications

Detailed technical specifications for the DALY 24S 72V 100A LiFePO4 BMS (Model LFP24S):

Figure 3: Physical dimensions of the DALY BMS, showing length, width, and height measurements.

8. Applications

The DALY BMS is suitable for a wide range of applications utilizing LiFePO4 battery packs, including but not limited to:

• Electric scooters and E-bikes
• Electric tricycles
• Low-speed electric vehicles (EVs)
• Emergency UPS systems
• Solar street lights
• RV and home energy storage systems
• Other Li-ion power battery applications

9. Warranty and Support

DALY provides a quality guarantee for its products. For any inquiries or technical support, please refer to the following:

• Quality Guarantee: The product is ISO/FCC/RoHS/PSE/CE approved.
• Customer Service: DALY offers 24-hour one-on-one customer service and lifetime technical support.
• Contact: If you require a customized BMS, bulk order, or have specific technical questions, please contact DALY customer service.

For more information or to contact support, visit the official DALY store on Amazon: DALY Official Store