EPEVER LiFePO4 (LFP) Battery User Manual

1 Important Safety Instructions

Thanks for selecting the EPEVER LiFePO4 battery; please read this manual carefully before using the product.

Do not use the product in humid, salt spray, corrosion, greasy, flammable, explosive, dust accumulative, or other severe environments.

Please keep this manual for future reference.

Work and storage precautions:

1. Please store the battery in a cool and dry place. Keep the battery away from corrosive, explosive, and insulating gases or conductive dust, as well as from sources of fire, heat, and high voltage. It is forbidden to immerse the battery in water, and keep children out of reach of the battery. No static electricity to the battery (static electricity can easily damage the battery protection circuit and cause battery damage).
2. Fix the battery securely in a reasonable environment, and connect the connector reliably to avoid contact friction causing arcs and sparks.
3. Handle the battery gently to avoid mechanical vibration, collision and pressure shock. Otherwise, it may cause the battery short circuit, resulting in high temperature and fire.
4. Do not short-circuit the battery, and do not disassemble the battery to avoid danger.
5. Please keep the battery in a half-charge state (40%~80% SOC is preferred). Please use non-conductive materials to wrap the battery, to avoid direct contact between metal and the battery, which may cause damage to the battery.
6. Dispose of discarded batteries safely and do not put them in fire or liquid.
7. This battery cannot be connected in series.

Hazard Warning

1. It is strictly forbidden to crush, drop, collide, puncture, burn and other destructive acts on the battery.
2. Do not disassemble the battery. Improper disassembly may damage the battery's protection function, causing battery deformation, heating, smoking, or burning.
3. Do not short-circuit the battery. It is prohibited to connect the battery positive and negative poles with conductive materials. And store and transport the battery together with conductive materials is also prohibited.
4. Do not heat or burn batteries Otherwise, it will cause the melting of battery components, loss of safety functions, or electrolyte combustion. Overheating can deform the battery, heat up, smoke or burn.

Emergency treatments

1. Avoid skin and eye contact with the electrolyte when it leaks. In case of contact, immediately wash with plenty of water and seek help from a doctor. It is forbidden for any person or animal to swallow any part of the battery or the substances contained in the battery.
2. If the battery is severely deformed or electrolyte leakage occurs, the battery should be placed in an explosion-proof box or open space when conditions permit; and personnel should evacuate quickly.
3. If the battery catches fire during use or storage, use a high-pressure water gun to extinguish the fire while ensuring personal safety.
4. If the battery catches fire during the charging process, turn off the charger power first and then take the next step to extinguish the fire.

2 General Information

2.1 Appearance

[Diagram: Front panel of the EPEVER LiFePO4 battery. Key components are labeled: 1. Battery positive terminal, 2. Power switch, 3. Battery negative terminal, 4. LCD display, 5. DIP switch, 6. Reset button, 7. POWER indicator, 8. RUN indicator, 9. ALARM indicator, 10. Battery SOC indicator, 11. Dry contact interface, 12. RS485com. port (RJ45), 13. CAN com. port, 14. RS232com. port (RJ11), 15. BMS com. port. Below the front panel diagram is an image of the battery unit itself, showing its model number LFP5.12KWH51.2V-P20R2EV50, Voltage (51.2 V), Capacity (100 Ah), and Energy (5120 Wh).]

2.2 Features

• Equipped with detection of cell voltage and overall voltage, alarm and protection for the over-voltage and under-voltage.
• Equipped with detection, alarm and protection for the charge and discharge current.
• Equipped with temperature detection for the cell, environment, and PCB; alarm and protect when charging and discharging at high and low temperatures.
• Equipped with detection and protection for the output short-circuit.
• Equipped with SOC calculation and charge discharge cycles calculation.
• Equipped with charging equalization function, reducing the charging current of high-voltage cells (the reduced current is the equalize current set by BMS).
• Equipped with LED indicators, indicating the battery SOC, fault status, running status, etc.
• Equipped with BMS manual and automatic sleep functions
• Auto charging current limit function.
• History storage function (not less than 500 storage capacity).
• With RS485 communication function to monitor the BMS and battery in real time.
• Two-level over-current protection for discharge, with different response speeds for different current, providing more reliable protection for the battery.

2.3 LCD

Introduction:

[Image: Main status page showing "Main State", "100%", "discharge 100A", "51.2V", "normal".]

[Image: Parallel Data page showing "STATE Idle", "VOLTAGE 53.04V", "CURRENT 63A", "Pack #01", "INFO Normal".]

Icon introduction:

• Main icon: Press to enter HOME page.
• Status icon: Press to enter Main State page.
• Parallel icon: Press to enter Parallel Data page.

2.4 LED Indicators

Battery Work Indicators instructions:

The battery SOC indicators L1~L6 correspond to the battery SOC 0%~100%, as shown in the diagram below:

[Diagram: Six circles labeled L6 to L1, representing battery SOC indicators.]

Exit sleep mode: When the BMS is in sleep mode, press and hold the power switch (ON/OFF button) for about 2 seconds to activate the battery.

Enter sleep mode: When the BMS is in standby or working state, press and hold the power switch for 3 seconds.

[Flash 1] means the indicator lights up for 0.25 seconds and then turns off for 3.75 seconds.

[Flash 2] means the indicator lights up for 0.5 seconds and then turns off for 0.5 seconds.

[Flash 3] means the indicator lights up for 0.5 seconds and then turns off for 1.5 seconds.

Battery SOC Indicators (Charging):

Battery SOC Indicators (Discharging):

2.5 Set the DIP Switch

When the battery pack is used in parallel, the communication address of each battery pack can be set by the DIP switch. The address cannot be set to the same. The definition of the DIP switch is referred to the following table. In battery parallel mode, the lithium battery with the address of 1 is the main battery. When batteries are not in parallel, the default DIP is 1, and the batteries can communicate with others.

[Diagram: Four DIP switches labeled 1, 2, 3, 4, with ON/OFF positions.]

3 Operation Instruction

3.1 Charging Operation

1. General Checking: Check thoroughly including all the cables for showing no damages. Make sure the mains supply complies with the specification of the charger and the battery.
2. Turn off the charger and connect it to the battery.
3. ⚠ WARNING: Check the battery polarity before connecting to the charger. It is forbidden to reverse connect the battery.
4. Connect the charger to mains supply and turn on the charger.
5. Press the LCD power button once, and the LCD shows "CHG" to start the charging process.
6. Standard charge: First, charge the battery to 57.6V with a constant current of 20A (0.2C), and then charge to 5A (0.05C) with a constant voltage of 57.6V.

3.2 Discharging Operation

1. Before discharging, ensure the load and equipment are in the off state.
2. Connect the battery to the load and equipment correctly.
3. ⚠ WARNING: Check the battery polarity before connecting to the load and equipment. It is forbidden to reverse connect the battery.
4. Turn on the load and equipment.
5. Press the LCD power button once, and the LCD shows "DISCH" to start the discharging process.
6. Standard discharge: After the battery is standard charged, discharging the battery with a constant current of 20A (0.2C) till the battery voltage drops to 41.6V.

Note: All tests stated in this document shall be performed at 25±2℃.

Precautions for charging and discharging:

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

⚠ WARNING: This lithium battery can only be used with EPEVER devices or the compatible devices. It is forbidden to use the lithium battery without communicate.

3.3 Battery Connection in Parallel

[Diagram: Schematic showing multiple EPEVER batteries connected in parallel to an inverter. Color-coded lines indicate power and communication wires: Positive output power wire, Negative output power wire, RS485 communication wire, Lithium battery positive parallel power wire, Lithium battery Negative parallel power wire, Lithium battery parallel communication wire (BMS~BMS).]

4 Protections

1. Cell/Overall Over-charge Protection: When the actual voltage of any cell/overall is higher than the over-charge protection voltage, and the duration reaches the over-charge delay, the battery enters the over-charge protection state. The charging MOS and charging current limiting module are turned off, and the battery cannot be charged. Protection Recovery: When the actual voltage of any cell/overall drops below the overcharge recovery voltage, the over-charge protection state is released. Protection can also be released by discharging.
2. Cell/Overall Over-discharge Protection: When the actual voltage of any cell/overall 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 is turned off, and the battery will not discharge. Protection Recovery:Charge the battery to release the over-discharge protection state.
3. Charge Over-current Protection (no charging current limit function): When the actual charging current exceeds the charging over-current protection current, and the duration reaches the over-current delay, the battery enters the charging 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 (which can be set), the battery will be locked and no longer recover. Charge over-current protection can also be released by discharging.
4. Discharge Over-current Protection: When the actual discharge current exceeds the over-current protection current, and the duration reaches the over-current delay, the battery enters the discharge over-current protection state. The battery no longer discharges. Protection Recovery:After an over-current occurs during discharging, the battery will automatically recover after a delay. After 10 consecutive attempts (which can be set), the battery will be locked and no longer recover. Discharge over-current protection can also be released by charging the battery.
5. Charge/Discharge High Temperature Protection: 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 is turned off. In this state, the battery cannot be charged or discharged.
6. Charge/Discharge Low Temperature Protection: 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 is turned off. In this state the battery cannot be charged or discharged. Protection Recovery: The cell temperature rises to the low temperature recovery value.
7. Environmental and PCB Temperature Alarm: When the NTC detects that the environmental and PCB temperature have reached the alarm value, the BMS issues a temperature alarm signal. Protection Recovery: The alarm will be cleared when the temperature drops to the alarm recovery value.

5 Specifications

1 The operation method of standard charging and standard discharge is repeated 3 times, and the initial capacity of the battery 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 at 52~53.6V.

3 For long-term storage, charge at least once every 3 months (no less than 30 minutes@0.2C).

6 Dimensions

[Diagram: Three views of the EPEVER battery unit showing dimensions. Top view shows width 482mm, depth 442mm. Front view shows height 176mm, depth 482mm. Side view shows height 176mm, width 442mm. Specific measurements like 463.0, 252.0, 124.9, 101.6, 37.2 are indicated.]

7 Disclaimers

• Damage caused by improper use or inappropriate environments (It is strictly forbidden to install the Energy Storage System in the humid, salt spray, corrosive, greasy, flammable, explosive, dust accumulative or other harsh environments).
• The actual current/voltage/power exceeds the limit value of the Energy Storage System.
• Damage caused by working temperature exceeding the rated temperature range.
• Electric arc, fire, explosion and other accidents caused by failure to follow the Energy Storage System labels or manual instructions.
• Unauthorized disassembly and maintenance of the Energy Storage System.
• Damage caused by force majeure such as lightning strikes, rainstorms, mountain torrents and Utility failures.
• Damage occurred during transportation or loading/unloading the Energy Storage System.

Any changes without prior notice! Version number: V1.3