EPEVER LiFePO4 (LFP) Battery

Table of Contents

• 1 Important Safety Instructions
• 2 General Information
• 3 Operation Instructions
• 4 Protections
• 5 Specifications
• 6 Dimensions
• 7 Warranty Exclusions

1 Important Safety Instructions

Thank you for choosing the EPEVER LiFePO4 battery; please read this manual carefully before using the product.

Do not use the product in humid environments, with salt spray, corrosive, greasy, flammable, explosive, dust accumulation, or other severe environments.

Please keep this manual for future reference.

Precautions for Work and Storage:

• a) Store the battery in a cool and dry place. Keep the battery away from corrosive gases, explosives, insulators or conductive dust, as well as sources of fire, heat, and high voltage. It is prohibited to immerse the battery in water and keep it out of reach of children. Avoid static electricity towards the battery (static electricity can easily damage the battery's protection circuit and cause damage to it).
• b) Securely fix the battery in a reasonable environment and connect the connector reliably to prevent friction contact from causing electric arcs and sparks.
• c) Handle the battery with care to avoid mechanical vibrations, collisions, and pressure impacts. Otherwise, it may cause a short circuit in the battery, resulting in increased temperature and possible fire.
• d) Do not short-circuit the battery and do not disassemble the battery to avoid hazards.
• e) Keep the battery in a partially charged state (preferably between 40% and 80% charge). Use non-conductive materials to wrap the battery, avoiding direct contact between metal and the battery, which could damage the battery.
• f) Dispose of discarded batteries safely and do not put them into fire or liquids.
• g) This battery cannot be connected in series.

Danger Warnings:

• a) It is strictly prohibited to crush, drop, hit, puncture, burn, or perform any other destructive act on the battery.
• b) Do not disassemble the battery. Incorrect disassembly may damage the battery's protection function, causing deformation, overheating, smoke emission, or fire.
• c) Do not short-circuit the battery. It is prohibited to connect the positive and negative terminals of the battery with conductive materials. It is also prohibited to store and transport the battery together with conductive materials.
• d) Do not heat or burn the batteries. Otherwise, the battery components will melt, safety functions will be lost, or the electrolyte will combust. Overheating may deform the battery, heat up, emit smoke, or even catch fire.

Emergency Treatments:

• a) Avoid contact with skin and eyes with electrolyte in case of leakage. In case of contact, wash immediately with plenty of water and seek medical attention. It is prohibited for any person or animal to ingest any part of the battery or the substances contained within the battery.
• b) If the battery is severely deformed or an electrolyte leakage occurs, the battery should be placed in an explosion-proof box or an open space, when conditions permit; and personnel should evacuate quickly.
• c) If the battery catches fire during use or storage, use a high-pressure water gun to extinguish the fire, ensuring personal safety is guaranteed.
• d) If the battery catches fire during the charging process, first turn off the charger's power supply and then proceed to take the following measures to extinguish the fire.

2 General Information

2.1 Appearance

Front panel layout of the EPEVER battery. Numbered components include:

• 1. Battery Positive Terminal
• 2. ON/OFF Switch
• 3. Battery Negative Terminal
• 4. LCD Screen
• 5. DIP Switch
• 6. Reset Button
• 7. POWER Indicator
• 8. RUN Indicator
• 9. ALARM Indicator
• 10. Battery SOC Indicator
• 11. Dry Contact Interface
• 12. RS485 Communication Port (RJ45)
• 13. CAN Communication Port
• 14. RS232 Communication Port (RJ11)
• 15. BMS Communication Port

RJ11 Pinout for RS232 Communication:

RJ45 Pinout for RS485/CAN Communication:

The BMS communication ports (dual RJ45) are used to connect batteries in parallel.

2.2 Characteristics

• Equipped with cell voltage and overall voltage detection, with alarm and protection for overvoltage and undervoltage.
• Equipped with detection, alarm, and protection for charging and discharging current.
• Equipped with temperature detection for cells, environment, and PCB; alarm and protection when charging or discharging at high or low temperatures.
• Equipped with detection and protection for output short circuits.
• Equipped with SOC (state of charge) calculation and charge/discharge cycle calculation.
• Equipped with charge equalization function, reducing the charging current of high-voltage cells (the reduced current is the equalization current configured by the BMS).
• Equipped with manual and automatic BMS sleep functions.
• Automatic charging current limit function.
• History storage function (storage capacity not less than 500).
• With RS485 communication function to monitor the BMS and battery in real time.
• Dual-level overcurrent protection for discharge, with different response speeds for different currents, providing more reliable protection for the battery.

2.3 Color LCD Screen

Interface Introduction:

• Main State Screen: Displays battery status, charge/discharge current (e.g., 'discharge 100A'), voltage (e.g., '51.2V'), and information status (e.g., 'normal'). Includes a battery level indicator showing 100%.
• Parallel Data Screen: Shows overall system status (e.g., 'STATE Idle'), voltage (e.g., '53.04V'), current (e.g., '63A'), and information (e.g., 'Normal'). It also displays individual battery pack status (e.g., 'Pack #01') and allows navigation through multiple packs.

Icon Introduction:

• Menu Icon: Tap to enter the main menu interface (HOME).
• Main State Icon: Click to enter the Main State interface.
• Parallel Data Icon: Click to enter the Parallel Data page.

HOME Screen (BMS Smart Battery Management System):

Displays system status with options like PACK_INFO, STATUS, PROTOCOL, SYSTEM.

2.4 Configure the DIP Switch

When the battery pack is used in parallel, the communication address of each battery pack can be configured via the DIP switch. The address cannot be the same for more than one pack. The definition of the DIP switch refers to the following table. In parallel battery mode, the lithium battery with address 1 is the master battery.

When batteries are not in parallel, the default DIP value is 1, and batteries can communicate with each other.

3 Operation Instructions

3.1 Charging Operation

1. General Check:
   • Verify completely, including all cables, to ensure there is no damage.
   • Ensure the mains power supply meets the specifications of the charger and the battery.
2. Turn off the charger and connect it to the battery.

[Warning] Verify the battery polarity before connecting it to the charger. Connecting the battery in reverse is prohibited.

3. Connect the charger to the mains power and turn on the charger.
4. Press the LCD ON/OFF button once, and the LCD will display "CHG" to start the charging process.

Standard Charging:

First, charge the battery to 57.6V with a constant current of 20A (0.2C), and then charge up to 5A (0.05C) with a constant voltage of 57.6V.

3.2 Discharging Operation

1. Before discharging, ensure the load and equipment are turned off.
2. Correctly connect the battery to the load and equipment.

[Warning] Verify the battery polarity before connecting it to the load and equipment. Connecting the battery in reverse is prohibited.

3. Turn on the load and equipment.
4. Press the LCD ON/OFF button once, and the LCD will display "DISCH" to start the discharging process.

Standard Discharging:

After the battery has been charged in standard mode, discharge the battery with a constant current of 20A (0.2C) until the battery voltage drops to 41.6V.

Note: All tests mentioned in this document should be performed at a temperature of 25±2°C.

Precautions for Charging and Discharging:

• a) During summer, when temperatures are high (≥35°C), fast charging during the day is not recommended. If fast charging is necessary during the day, it is better to wait at least one hour after discharging, and the charging time should not exceed half an hour.
• b) During winter, when temperatures are low (<0°C), the battery should be charged as soon as possible after discharging to avoid prolonged charging times due to the low battery temperature.

[Warning] This lithium battery should only be used with EPEVER devices or compatible devices. Using the lithium battery without communication is prohibited.

3.3 Parallel Battery Connection

When the battery pack is used in parallel, the communication address of each battery pack can be configured via the DIP switch. The address cannot be the same for more than one pack. The definition of the DIP switch refers to the following table. In parallel battery mode, the lithium battery with address 1 is the master battery.

The schematic diagram of batteries connected in parallel is as follows:

Schematic diagram illustrating the parallel connection of EPEVER LiFePO4 batteries with an inverter. It shows multiple battery units connected in parallel. The diagram includes color-coded cables:

• Red: Positive output power cable
• Black: Negative output power cable
• Grey: RS485 communication cable
• Orange: Positive parallel connection cable for the lithium battery
• Blue: Negative parallel connection cable for the lithium battery
• Green: BMS-to-BMS communication cable for the lithium battery

4 Protections

1. Cell/Global Overcharge Protection: When the actual voltage of any cell or the entire system exceeds the overcharge protection voltage, and the duration reaches the overcharge delay, the battery enters the overcharge protection state. The charging MOS and charging current limiting module turn off, and the battery cannot be charged. Protection Recovery: When the actual voltage of any cell or the entire system drops below the overcharge recovery voltage, the overcharge protection state is released. Protection can also be released by discharging.
2. Cell/Global Over-discharge Protection: When the actual voltage of any cell or the entire system is lower than the over-discharge protection voltage, and the duration reaches the over-discharge delay, the battery enters the over-discharge protection state. The discharging MOS turns off, and the battery will not discharge. Protection Recovery: Charge the battery to release the over-discharge protection state.
3. Over-current Protection (Charging): When the actual charging current exceeds the over-current protection threshold, and the duration reaches the over-current delay, the battery enters the over-current protection state and cannot be charged. Protection Recovery: After an over-current occurs during charging, the battery will automatically recover after a delay. After 10 consecutive attempts (this can be configured), the battery will lock and will not recover further. Over-current protection can also be released by discharging.
4. Over-current Protection (Discharging): When the actual discharging current exceeds the over-current protection threshold, and the duration reaches the over-current delay, the battery enters the over-current discharge protection state. The battery stops discharging. Protection Recovery: After an over-current occurs during discharging, the battery will automatically recover after a delay. After 10 consecutive attempts (this can be configured), the battery will lock and will not recover further. Over-current discharge protection can also be released by charging the battery.
5. High Temperature Protection (Charging/Discharging): During the charging and discharging process, when the NTC (negative temperature coefficient thermistor) detects that the cell temperature is higher than the high-temperature protection value, the charging or discharging MOSFET turns off. In this state, the battery cannot be charged or discharged. Protection Recovery: The cell temperature drops to the high-temperature recovery value.
6. Low Temperature Protection (Charging/Discharging): During the charging and discharging process, when the NTC detects that the cell temperature is lower than the low-temperature protection value, the charging or discharging MOSFET turns off. In this state, the battery cannot be charged or discharged. Protection Recovery: The cell temperature increases to the low-temperature recovery value.
7. Ambient and PCB Temperature Alarm: When the NTC detects that the ambient temperature and the PCB temperature have reached the alarm value, the BMS emits a temperature alarm signal. Protection Recovery: The alarm will be cleared when the temperature drops to the alarm recovery value.

5 Specifications

1. The standard charge and standard discharge operation method is repeated 3 times, and the initial battery capacity is taken as the result of the third time.

2. When the battery is stored for more than 3 months, the storage voltage should be maintained between 52~53.6V.

3. For long-term storage, charge at least once every 3 months (not less than 30 minutes at 0.2C).

6 Dimensions

Technical drawings showing the dimensions of the EPEVER battery. Key measurements include:

• Overall Width: 482±2 mm
• Overall Depth: 482 mm
• Overall Height: 176±2 mm
• Front panel height: 101.6 mm
• Front panel depth: 37.2 mm
• Side panel depth: 124.9 mm
• Main body width: 442±2 mm
• Main body depth: 502±2 mm

7 Warranty Exclusions

The warranty does not apply under the following conditions:

• Damage caused by improper use or inappropriate environments (It is strictly prohibited to install the Energy Storage System in humid environments, with salt fog, corrosive, greasy, flammable, explosive, dust accumulation, or other hostile environments).
• The actual current/voltage/power exceeds the limit value of the Energy Storage System.
• Damage caused by working temperatures exceeding the nominal temperature range.
• Electric arc, fire, explosion, and other accidents caused by not following the labels or instructions of the Energy Storage System manual.
• Unauthorized disassembly and maintenance of the Energy Storage System.
• Damage caused by force majeure, such as lightning, storms, torrents, and power supply failures.
• Damage occurring during transportation or charging/discharging of the Energy Storage System.

Any changes without prior notice! Version Number: V1.4

Contact Information:

HUIZHOU EPEVER TECHNOLOGY CO., LTD

Beijing Service Hotline: 010-82894896/82894112

Huizhou Service Hotline: 0752-3889706

Shenzhen Service Hotline: 0755-89236770

E-mail: sales@epever.com

Website: www.epever.com.cn