SUNKET-ESS LFP 5000 LiFePO4 Battery User Manual

: June 13, 2024
: SUNKET-ESS

SUNKET-ESS LFP 5000 LiFePO4 Battery

SUNKET-ESS-LFP-5000-LiFePO4-Battery

Product Information

Product Name: LFP 5000
Nominal Voltage: 51.2V
Nominal Capacity: 100Ah
Battery Type: LiFePO4 (Lithium Iron Phosphate)
Product Manual: LFP5000 User Manual

Product Usage Instructions

Safety Precautions:

Read and understand the safety precautions mentioned in the user manual before using the product.
Follow all the safety guidelines to ensure safe and proper usage of the LFP 5000 battery.

Preface:
The SUNKET-ESS LFP5000 lithium iron phosphate battery energy storage system is designed to provide energy storage for photovoltaic power generation users. It can store excess electricity from the photovoltaic power generation system during the day and supply stable power as a backup during the night or whenever needed. The LFP5000 battery improves the efficiency of photovoltaic power generation and increases electric power efficiency by peak load shifting.

Introduction:
The LFP5000 lithium iron phosphate battery system is a standard battery unit that can be connected in parallel to form a larger capacity battery pack. It is suitable for energy storage applications with high operating temperatures, limited installation space, long power backup time, and long service life.

Product Specification:
The LFP5000 battery has the following specifications:

Nominal Voltage: 51.2V
Work Voltage Range: 43.2V to 56V
Nominal Capacity: 100Ah
Nominal Energy: 5.12 kWh
Max. Charge Current: 50A
Max. Discharge Current: 50A
Max. Charge Voltage: 58.4V

Interface Definition:
The LFP5000 battery has the following interface functions:

Item Name	Definition
SOC	The number of green lights shows the remaining power. Refer to

Table 2-3 for details.
ALM| Red light flashing when an alarm occurs, red light always on
during protection status. After the condition of trigger protection
is relieved, it can be automatically reset.
RUN| Green light flashing during standby and charging mode. Green
light always on when discharge mode.
ADD| DIP switch
CAN| Communication cascade port, supports CAN communication.
RS485| Communication cascade port, supports RS485 communication.
Res| Reset switch
power| Power switch
Positive socket| Battery output positive or parallel positive line
Negative socket| Battery output negative or parallel negative line

DIP Switch Description:
When the batteries are connected in parallel, the host communicates with the slaves through the 485 interface. The host summarizes the information of the entire battery system and communicates with the inverter through CAN.

Safety Precautions

Warning

Please do not put the battery into water or ﬁre, in case of explosion or any other situation that might endanger your life.
Please connect wires properly while installation, do not reverse connect.
To avoid short circuit, please do not connect positive and negative poles with conductor on the same device.
Please avoid any form of damage to battery, especially stab, hit, trample or strike.
Please shut oﬀ the power completely when removing the device or reconnecting wires during the daily use or it could cause the danger of electric shock.
Please use dry powder extinguisher to put out the ﬂame when encountering a ﬁre hazard, liquid extinguisher could result in the risk of explosion.
For your safety, please do not arbitrarily dismantle any component in any circumstances. The maintenance must be implemented by authorized technical personnel or our company’s technical support. Device breakdown due to unauthorized operation will not be covered under warranty.

Caution

Our products have been strictly inspected before shipment. Please contact us if you find any abnormal phenomena such as device outer case bulging.
The product shall be grounded properly before use in order to ensure your safety.
To assure the proper use please make sure parameters among the relevant device are compatible and matched.
Please do not mixed- use batteries from different manufacturers, different types and models, as well as old and new together.
Ambient and storage method could impact the product life span, please comply with the operation environment instruction to ensure device works in proper condition.
For long-term storage, the battery should be recharged once every 6 months, and the amount of electric charge shall exceed 80% of the rated capacity.
Please charge the battery in 18 hours after it fully discharged or over-discharging protection mode is activated.
Formula of theoretical standby time: T=C/ I (T is standby time, C is battery capacity, I is total current of all loads).

Preface

Manual declaration

SUNKET-ESS LFP5000 lithium iron phosphate battery energy storage system can provide energy storage for photovoltaic power generation users through parallel combination. Our product can store extra electricity into battery from photovoltaic power generation system in daytime and supply stable power to user’s equipment as power backup at nighttime or any time when needed. It can improve the efficiency of photovoltaic power generation and increase the electric power efficiency by peak load shifting. This user manual details the basic structure, parameters, basic procedures and mthods of installation and operation and maintenance of the equipment.

Introduction

Brief Introduction
LFP5000 lithium iron phosphate battery system is a standard battery system unit, customers can choose a certain number ofFP5000 according to their needs, by connecting parallel to form a larger capacity battery pack, to meet the user’s long-term power supply needs. The product is especially suitable for energy storage applications with high operating temperatures, limited installation space, long power backup time and long service life.

Product Properties
LFP5000 energy storage product’s positive electrode materials are lithium iron phosphate, battery cells are managed effectively by BMS with better performance, the system’s features as below:

Comply with European RoHS, Certified SGS, employ non-toxic, non-pollution environment- friendly battery.
Anode materials are lithium iron phosphate (Li FeP04), safer with longer life span.
Carries battery management system with better performance, possesses protection function like over-discharge, over-charge, over-current, abnormal temperature.
Self-management on charging and discharging, Single core balancing function.
Intelligent design configures integrated inspection module.
Flexible configurations allow parallel I of multi battery for longer standby time.
Self-ventilation with lower system noise.
Less battery self-discharge, then recharging period can be up to 10 months during the storage.
No memory effect so that battery can be charged and discharged shallowly. With wide range of temperature for working environment, -20°C ~ +55 C, circulation span and discharging performance are well under high temperature.
Less volume, lighter weight.

Product identity definition

SUNKET-ESS-LFP-5000-LiFePO4-Battery-fig-1

Product Specification

Size and Weight

Table 2. 1 LFP5000 Device size

Product| Nominal

Voltage

| Nominal

Capacity

| Dimension| Weight
---|---|---|---|---
LFP5000| DC51.2V| 100Ah| 453×433×177mm| ≈65kg

Performance Parameter

Table 2-2 LFP5000 performance parameter

Item	Parameter value
Nominal Voltage(V)	51.2
Work Voltage Range(V)	43.2~56
Nominal Capacity(Ah)	100
Nominal Energy(kWh)	5.12
Max. Charge Current (A)	50
Max. Discharge Current (A)	50
Max. Charge Voltage (Vdc)	58.4

Interface Definition
This section elaborates the interface functions of the front interface of the device

Table 2-3 Interface Deﬁnition

Item	Name	Definition
1	SOC	The number of green lights shows the remaining power. Table 2-3

for details.
2| ALM| Red light flashing when an alarm occurs, red light always on

during protection status. After the condition of trigger protection is relieved, it can be automatically

DIP switch description:
When the batteries are connected in parallel, the host communicates with the slaves through the 485 interface. The host summarizes the information of the entire battery system and communicates with the inverter through CAN.

Table 2-5
CAN Pin Definition

Foot position	Color	Deﬁnition
PIN1	Orange/white	NC
PIN2	Orange	NC
PIN3	Green/white	XGND
PIN4	Blue	CAN-H
PIN5	Blue/white	CAN-L
PIN6	Green	XGND
PIN7	Brown/white	NC
PIN8	Brown	NC

485 Pin Definition

Foot position	Color	Deﬁnition
PIN1	Orange/white	RS485-B
PIN2	Orange	RS485-A
PIN3	Green/white	XGND
PIN4	Blue	NC
PIN5	Blue/white	NC
PIN6	Green	XGND
PIN7	Brown/white	RS485-A
PIN8	Brown	RS485-B

Tips: Please pay attention of the communication com definition of inverter, in order to avoid voltage in the port to aﬀect communication.

Table 2-6 LED status indicators

Battery

Status

| SOC| LED4| LED3| LED2| LED1| ALM| RUN
---|---|---|---|---|---|---|---
Shutdown| /| oﬀ| oﬀ| oﬀ| oﬀ| oﬀ| oﬀ
Standby| /| oﬀ| oﬀ| oﬀ| oﬀ| oﬀ| Flashing

Charging

| 0% ＜ SOC≤25%| oﬀ| oﬀ| oﬀ| Flashing| oﬀ|

●

25%＜SOC＜50%| oﬀ| oﬀ| Flashing|

●

| oﬀ|

●

50%＜ SOC≤75%| oﬀ| Flashing|

●

|

●

| oﬀ|

●

SOC>75%| Flashing|

●

|

●

|

●

| oﬀ|

●

Discharging

| 0% ＜ SOC≤25%| oﬀ| oﬀ| oﬀ| Flashing| oﬀ| Flashing
25%＜SOC＜50%| oﬀ| oﬀ| Flashing|

●

| oﬀ| Flashing
50%＜ SOC≤75%| oﬀ| Flashing|

●

|

●

| oﬀ| Flashing
SOC>75%| Flashing|

●

|

●

|

●

| oﬀ| Flashing

means green light always on

Battery Management System(BMS)

Voltage Protection

Low Voltage Protection in Discharging:
When any battery cell voltage or total voltage is lower than the rated protection value during discharging, the over-discharging protection is activated. Then battery system stops supplying power to the outside. When the voltage of each cell back to rated return range, the protection is over.

Note: After the BMS is turned off after discharging and under -voltage protection, the button is activated or the charging is activated, the BMS will keep output voltage for 1 minute to detect the battery voltage of the inverter, so it is not allowed to discharge within 1 minute.

Over Voltage Protection in Charging:
Battery will stops charging when total voltage or any battery cell voltage reaches the rated protection value during charging stage. When total voltage or all cell back to rated range, the protection is over.

Current Protection

Over Current Protection in Charging:
When the charging current is >50A, the current limit protection mode is activated. If the current does not drop within 10S, the charging current will be limited. It can be restored after 60S or the discharge can be restored immediately.

Over Current Protection in Discharging:
When the discharging current is >50A, the current limit protection mode is activated. If the current does not drop within 10S, the discharging current will be limited. It can be restored after 60S or the charge can be restored immediately.

Temperature Protection

Low/Over temperature protection in charging:
When battery’s temperature is beyond range of 0 °C ~+50 °C during charging, temperature protection is activated, device stops charging. The protection is over when temperature back to rated working range.

Low/Over temperature protection in discharging:
When battery’s temperature is beyond range of -20°C ~+55°C during discharging, temperature protection is activated, device stops supplying power to the outside. The protection is over when temperature back to rated working range.

Other Protection

Short Circuit Protection:
When the battery is activated from the shutdown state, if a short circuit occurs, the system starts short-circuit protection.

Self-Shutdown:
When device connects no external loads and power supply and no external communication for over 48 hours, device will dormant standby automatically.

Caution
Battery’s maximum discharging current should be more than load’s maximum working current.

Installation and Configuration

Preparation for installation

Safety Requirement
This system can only be installed by personnel who have been trained in the power supply system and have sufficient knowledge of the power system. The safety regulations and local safety regulations listed below should always be followed during the installation.

All circuits connected to this power system with an external voltage of less than 51.2V must meet the SELV requirements defined in the IEC60950 standard.
If operating within the power system cabinet, make sure the power system is not charged. Battery devices should also be switched off.
Distribution cable wiring should be reasonable and has the protective measures to avoid touching these cables while operating power equipment.
When installing the battery system, must wear the protective items below:

Environmental requirements

Working temperature: -20°C ~ +50°C
Charging temperature range is 0°C~+50°C,
Discharging temperature range is -20°C ~+55 °C
Storage temperature: – 30°C~ +45°C
Relative humidity: 5% ~ 85% RH
Elevation: no more than 4000m
Operating environment: Indoor installation, sites avoid the sun and no wind, no conductive dust and corrosive gas.

And the following conditions are met:

Installation location should be away from the sea to avoid brine and high humidity environment.
The ground for product arrangement shall be flat and level. No flammable explosive materials near the installation site.
The optimal ambient temperature is 15°C~ 30 °C Keep away from dust and messy zones

Tools and data
Tools and meters that may be used are shown in table 3- 1.

Table 3. 1 Tool instrument

Name

Technical preparation

Electrical interface check
Devices that can be connected directly to the battery can be user equipment, power supplies, or other power supplies .

Confirm whether the user’s PV power generation equipment, power supply or other power supply equipment has a DC output interface, and measure whether the DC power output voltage meets the voltage range requirements in Table 2-2.
Confirm that the maximum discharge current capability of the DC power interface of the user’s photovoltaic power generation equipment, power supply or other power supply equipment should be higher than the maximum charging current of the products used in Table 2-2. If the maximum discharge capacity of the DC power interface of the user’s photovoltaic power generation equipment is less than the maximum charging current of the products used in Table 2- 2, the DC power interface of the user’s photovoltaic power generation equipment shall have a current limiting function to ensure the normal operation of the user’s equipment.
Verify that the maximum operating current of the battery-powered user equipment (inverter DC input) should be less than the maximum discharge current of the products used in Table

The security check

Firefighting equipment should be provided near the product, such as portable dry powder fire extinguisher.
Automatic fire fighting system shall be provided for the case where necessary.
No flammable, explosive and other dangerous materials are placed beside the battery.

Unpacking inspection

When the equipment arrives at the installation site, loading and unloading should be carried out according to the rules and regulations, to prevent from being exposed to sun and rain.
Before unpacking, the total number of packages shall be indicated according to the shipping list attached to each package, and the case shall be checked for good condition.
In the process of unpacking, handle with care and protect the surface coating of the object.
Open the package, the installation personnel should read the technical documents, verify the list, according to the configuration table and packing list, ensure objects are complete and intact, if the internal packing is damaged, should be examined and recorded in detail.

Packing list is as follows:

Engineering coordination

Attention should be paid to the following items before construction:

Power line specification. The power line specification shall meet the requirements of maximum discharge current for each product.
Mounting space and bearing capacity.
Make sure that the battery has enough room to install, and that the brackets have enough load capacity.
Wiring.
Make sure the power line and ground wire are reasonable. Not easy to short- circuit, water and corrosion. 3.2 Equipment installation Table 3-2 Installation steps

Equipment installation

Table 3-2 Installation steps

Step1

| Installation preparation| Confirm that the ON/OFF switch on the front panel of LFP5000 unit is in the “OFF” state to ensure no live

operation.

---|---|---

Step 2

| Mechanical installation| 1. Battery placement position determination
2 Battery module installation

Step3

|

Electrical installation

| 1. Ground cable installation
2. Battery module parallel cable installation
3 . Parallel communication cable connection

Step4

|

Battery system self-test

| 1. Turn the ON/OFF switch to the “ON” state
2. Press SW button 3 S to wake up battery
3. Check the system output voltage and led status
4. Shut down the system

Step5

|

Connecting inverter

| 1. Connect total positive & total negative cable of the

battery system to the inverter

2 Battery module total positive cable installation
3. Battery module total negative cable installation
4 . Connect the communication cable from the
master CAN

IN to the inverter

5. Turn on the Power switch and wake up system by SW

button

6 Close the D C breaker between inverter and battery
7.Turn on the inverter and check the communication between inverter and battery system

Installation Preparation

Prepare to install equipment and tools to detect if the battery is off.
Confirm the form of the battery. The two forms can be switched as required, as shown in Figure 3-1, and can be used in a matching cabinet, as shown in Figure 3-2, which can be directly stacked. (Picture 3-2 bracket needs to be purchased additionally)

Mechanical installation

Place the LFP5000, as shown in Figure 3-3, align the upper and lower mounting ears holes, and then assemble by the combination of bolts – spring washers – flat washers – mounting ears – nuts. A total of 8 sets of corners need to be assembled.

Electrical installation
Before connecting the power cables, use multimeter to measure cable continuity, short circuit, confirm positive and negative, and accurately mark the cable labels.

Measuring methods:

Power cable check: select the buzzer mode of multimeter and detect the both ends of the same color cable. If the buzzer calls, it means the cable is in good condition.
Short circuit judgment: choose multimeter resistor file, probe the same end of positive and negative pole, if the resistor shows infinity, means that the cable is available.
After visual testing of power line connection, the positive and negative poles of the battery shall be connected respectively to the positive and negative poles of the opposite terminal.
It is better to add a circuit breaker between the inverter and the battery system. The selection of the circuit breaker requires: Voltage:>60V, current:|=Inverter power/51.2V.

Note:

For more ADD Settings, Reference 2.3. 1 “DIP switch definition and description”
After the whole system connection, set the master DIP mode according to the inverter model firstly, then start the battery.
The BAT- INV comms cable is from inverter comm port to master CAN IN port, BAT- BAT cable is from master CAN OUT to slave CAN IN, slave1 CAN OUT to slave2 CAN IN …
Each pair of power cable, it’s limited continuous current is 120A, so if the inverter Max. work current more than 120A, please add power cable according to the proportion.

Battery parameter settings on the inverter

Max Charging(Bulk) Voltage: 58.4V
Absorption Voltage: 56.8V
Float Voltage: 54V
Shut Down(cut off) Voltage: 50V
Shut Down(cut off) SOC: 15%
Max Charge Current: 50A * battery QTY
Max Discharge Current: 50A* battery QTY

Use, maintenance and troubleshooting

Battery system usage and operation instructions
After completing the electrical installation, follow these steps to start the battery system.

Refer to the description of the DIP switch of 2.3.1 to prepare the battery module before starting up, then press the ON/OFF button to the ON position, press and hold the SW button for 3 seconds.
After the indicator self-test, the RUN indicator will light and the SOC indicator will be on (100% SOC status in the Figure4- 1).

Caution:

After pressing the power button, if the battery status indicator on the front panel continues to be red, please refer to the “4.2 Alarm description and processing”. If the failure cannot be eliminated, please contact the dealer timely.
Use a voltmeter to measure whether the voltage of the circuit breaker battery access terminal is higher than 48V, and check whether the voltage polarity is consistent with the inverter input polarity. If the circuit breaker battery input terminal has a voltage output and is greater than 48, then the battery begun to work normally.
After confirming that the battery output voltage and polarity are correct, turn on the inverter, close the circuit breaker.
Check if the indicator of the inverter and battery connection (communication indicator and battery access status indicator) is normal. If it is normal, successfully complete the connection between the battery and the inverter. If the indicator light is abnormal, please refer to the inverter manual for the cause or contact the dealer.

Alarm description and processing
When protection mode is activated or system failure occurred, the alarm signal will be given through the working status indicator on the front panel of the LFP5000. The network management can query the specific alarm categories. If the fault such as single cell over voltage, charging over-current, under- voltage protection, high- temp protection and other abnormalities which affects the output, please deal with it according to Table 4- 1.

Table 4- 1 Main alarm and Protection

Statue	Alarm category	Alarm indication	Processing

Charge state

| Over-current| RED| Stop charging and find out

the cause of the trouble

High temp| RED| Stop charging

Discharge state

| Over-current| RED| Stop discharging and find

out the cause of the trouble

High temp| RED| Stop discharging and find

out the cause of the trouble

Total voltage

undervoltage

| RED| Start charging
Cell voltage

undervoltage

| RED| Start charging

Analysis and treatment of common faults

Analysis and treatment of common faults in the Table 4-2:

Table 4-2 Analvsis and treatment of common faults

No .|

Fault phenomenon

|

Reason analysis

|

Solution

---|---|---|---

1

| The indicator does

not respond after the power on

|

Total voltage lower than 35V

|

Check the total voltage

2

|

No DC output

| Battery data status is abnormal. Battery gets into over-discharged

protection

| Read the battery

information on the monitor.

3

| The DC power supply time is too short|

Battery capacity become smaller

| Storage battery

replacement or add more modules

4| The battery can’t be

fully charged to 100%

| Charging voltage is too low| Adjust charging voltage at

57V or 57.6V

5

| The power cable

sparks once power on and ALM light RED

|

Power connection short-circuit

| Turn off the battery, check the cause of the short

circuit

6

|

Communication fault

| The DIP setting of the host is wrong/ the battery type of the inverter is wrong/

Communication cable used incorrectly/The communication cable is incorrectly connected at the battery communication port or the inverter communication port/The battery firmware version is too low to support the inverter

|

Check these possible causes one by one