ATESS BC Series User manual

GROWATT-ATESS Industrial Park, No.23 Zhulongtian Road, Shuitian Community,
Shiyan Street, Baoan District, Shenzhen
Shenzhen ATESS Power Technology Co.,Ltd

Foreword
Legal Notices
The copyright of this material belongs to the company. No unit or individual may
extract, copy or translate in any way without the written permission of the
copyright owner.
Infringement must be investigated.
This manual does not grant the reader any license or right to use any of the marks
appearing in this manual without the prior written consent of the company or third
party trademark or trade name owner.
This product complies with the design requirements for environmental protection
and personal safety. The storage, use and disposal of the product shall be in
accordance with the product manual, relevant contract or relevant national laws
and regulations.
Manual description
The BC series of energy storage systems provide energy storage for PV users.
During the day, the excess power of PV power generation can be stored in the
battery. At night or when needed, the stored electrical energy can be used to
supply power to the electrical equipment, which can improve the efficiency of PV
power generation, peak filling and valley filling, and emergency power backup.
This user manual system details the basic structure, parameters, basic procedures
and methods of installation and operation and maintenance of the equipment.

Summarize
Safety Precautions
System Introductions
Catalogue
1
2
3
1.1 Symbol Introduction
1.2 Special Instructions
2.1 General Safety Considerations
2.2 Electrical Safety
2.3 Battery Safety
2.4 Wiring Requirements
2.5 Mechanical Safety
3.1 Introduction
3.2 Battery module
3.3 BPU
3.4 Operation mode
3.5 Battery cabinet
Device installation and
configuration
6
Maintenance
7 7.1 Electrical and Fixed Parts Connection
7.2 leaning
Transportation and
storage requirements
5
Common troubleshooting
8 8.1 Fault and abnormal state processing
8.2 Annex B
Operating environment
4
5.2 Transportation
5.1 Transportation and Storage
6.1 Installation preparation
6.2 Tool Preparation
6.3 Unpacking inspection
6.4 Preparation before installation
6.5 Battery module installation
6.6 Electrical connections
6.7 Post-installation check
6.8 Power on
6.9 function operation and testing

1 Summarize
1.1 Symbol Introduction
This manual covers the installation and use of the battery energy storage system
product.
Please read this manual before installation.
The energy storage system must be commissioned and maintained by the engineers
who had been trained, otherwise it may lead to injury and equipment failure. The
resulting equipment damage is not covered by the warranty.
The pictures configured in the manual just for illustrative purposes. If it is not match
the actual product, please refer to the actual product.
2
 The product should be used under the specified working environment (voltage,
current, temperature, humidity, etc.), otherwise the product may malfunction. The
resulting product malfunction or component damage is not covered by the
product warranty.
 Operators should comply with local regulations. The safety precautions in the
manual are only intended to supplement local safety regulations.
 It is strictly forbidden to wear items such as watches, bracelets, bracelets, rings,
etc. that are easily conductive during operation.
 Special insulated tools must be used during operation.
 The torque wrench should be used to fix the screw and double check the screw
with the red and black logo. After the installer confirms that the screws are
tightened, please mark black on the screws; the inspector confirms that the screws
are tightened, please mark red on the screws.
 Installation or maintenance operations must follow the steps in the
specification and manual.
 If you need to touch any conductor surface or terminal, use a meter to measure
the voltage at the contact point before contact, and verify that the contact point is
voltage-free or voltage within the predicted range.
 If the cable is stored in an environment below 0℃, the cable must be stored in
room temperature environment (25±5℃) for more than 24 hours before the cable
is used.
 After the product is installed, routine inspection and maintenance is necessary,
and replace the faulty components in time to ensure the safe operation of the
product.
2.1 General Safety Considerations
1
BCU: Battery Control Unit
BMU: Battery Management Unit
BMS: Battery Management System
ESS: Energy Storage System
BC（Battery Cabinet）:Energy storage battery cabinet
BR（Battery rack）：Energy storage battery rack
This sign indicates safety hazard during operation. Failure to follow
such warning information, it will directly lead to serious personal
injury or death
This sign indicates a potential hazard during operation. Failure to
follow such warnings may result in personal injury or death.
This sign indicates a potential hazard during operation. Failure to
follow such warnings may result in personal injury or death.
WARNING
DANGER
CAUTION
1.2 Special Instructions
Safety Precautions
2

4
3
Wear protective tools such as helmet, insulated shoes, gloves, etc. before
installation, maintenance or operation the product.
 Pay attention to the safety protection of the battery to avoid collision and falling,
when installing, maintaining, and operation the product.
 The wiring circuit should be kept disconnected during installation, maintenance.
 Tighten the cable according to the torque in the manual, to prevent poor contact
and cause heat or even damage the product.
 It is strictly forbidden to damage the battery explosion-proof valve or exhaust
valve, otherwise it will cause electrolyte leakage.
 Make sure that the installed battery is the same model.
 Always dispose of used batteries in accordance with local regulations.
 The storage environment of the battery should be free from direct sunlight or rain,
dry and well ventilated, and the surrounding environment is clean and away from
fire.
>Do not allow anyone or animals to swallow any parts of the battery or the contents
of the battery.
> Do not pierce the battery with nails or other sharp objects.
> Do not put the battery into fire or expose it to high temperatures for a long time, as
this may cause a fire.
> Lithium batteries are not allowed to be charged at low temperatures (<0°C).
> If the model of the replacement battery is incorrect, there is a safety hazard.
2.2 Electrical Safety
Grounding Requirements
When installing the product, the protective grounding wire must be installed first;
when the product is removed, the protective grounding wire must be removed at the
end.
Before operating the product, check the product to ensure that the product is reliably
grounded (≤4Ω). Not well grounding of the equipment may result in personal injury
and equipment damage.
AC and DC Operation Requirements
DANGER
 The supply voltage of the energy storage system is dangerous (>60V). Direct
contact the system or indirect contact the system through wet objects can be
dangerous.S
 Incorrect operation may result in accidents such as fire or electric shock.
 Before the product is electrically connected, the front-end protection switch of
the product must be disconnected.
 Before connecting AC power, must ensure that the electrical connections of the
equipment has done.
 Before connecting the load cable or battery cable, must confirm the polarity of the
cables and terminals is correct, prevent reverse connection.
The installation location of product should be away from the liquid area, prevent
liquid from entering the product and causing short circuit, and to ensure that there is
no condensation in the room and product.
 When liquid enter the room or product, turn off the power immediately and notify
the manager.
Anti-liquid Requirement
2.3 Battery Safety
Basic Requirements
DANGER
DANGER

56
The battery cell and battery system (module, pack, rack, system) circuit must not
have any form of short-circuited, otherwise short-circuit may cause fire and may
cause personal injury.
If possible, disconnect the battery connection before operation.
 Charging current shall not exceed the maximum charging current in the
specifications. Otherwise it would cause the problem in charge and discharge
performance, mechanical performance and safety performance.
 Charging voltage shall not exceed the maximum charging current in the
specifications. Otherwise it would cause the problem in charge and discharge
performance, mechanical performance and safety performance.
 Batteries must be charged within the ambient temperature range of 0°C ~45°C.
 Forbidding reverse charge. Battery should be connected correctly. It is strictly
prohibited to reverse charge. Otherwise it will cause the battery scrap and produce
safe hidden trouble.
Discharge current shall not exceed the maximum charging current in the
specifications. Otherwise it would cause dramatically capacity loss and overheating.
 Batteries must be discharge within the ambient temperature range of -20°C
~55°C.
 Forbidding over-discharge. Battery management system should be installed to
prevent over discharge during the usage. Over discharge will cause the battery scrap
and produce safety hazard. It is necessary to state that for the battery not used for a
long time, it may over discharge due to the self-discharge characteristics. To prevent
the occurrence of over discharge, the battery should be regularly charge and the
voltage should be remained above 3.2 V.
2.4 Wiring Requirements
 Cable used in high temperature environment, will cause the insulation aged or
damaged. Thus the cable should be kept at a sufficient distance from the DC bus bar,
splitter, and fuse.
 Signal lines and power cable should be routed separately (≥60cm).
 User-supplied cables should meet the VW-1 test requirements.
 No cable is allowed to pass behind the air outlet of the power module in the
cabinet.
>Do not immerse the battery in water. When it is not in use, it should be placed in a
cool and dry environment.
>Do not use or leave the battery near hot and high temperature sources such as fire,
heaters, etc.
>Forbidden to reverse the positive and negative terminals of the battery during use.
> Forbidden to connect the positive and negative terminals of the battery directly
with metal, resulting in short circuit of the battery.
>Forbidden to transport or store batteries with metals such as hairpins, necklaces,
etc.
> Forbidden to strike or throw, trample or bend the battery.
WARNING
Battery Short Circuit Protection
DANGER
Battery leakage protection
Excessive battery temperature can cause battery deformation, damage, and
electrolyte spillage.
When the electrolyte of the lithium battery is found to leak, the skin and eyes should
be prevented from directly contacting the electrolyte. If there is contact, use plenty
of water to clean the area and contact doctor for help.
CAUTION
Charging
Discharge

8
7
 When carrying heavy objects, be prepared for weight bearing to avoid being
crushed or sprained by heavy objects.
 Generally, forbidden to transport the heavier product by one person.
 Wear protective gloves when handling product by hand to prevent your hands
from being cut by sharp corners.
 When transporting with a forklift, the forklift fork should in the middle position to
ensure symmetry. Do not excessively bump and tilt during handling. The angle of the
left and right tilt of the equipment during loading or unloading should not exceed
15°+. In order to avoid tipping over, please fasten the product to the forklift with a
rope before moving, and take care when moving. Be careful to move the product to
avoid damage caused by any impact or drop.
System Introductions 3
The BC Series energy storage system uses a LFP battery equipped with a custom
battery management system (BMS) designed for industrial and commercial energy
storage applications. During the day, the excess PV power generation can be stored
in the battery. At night or when needed, the stored energy can be supplied to the
load, which can improve the efficiency of PV power generation, peak shaving, and
emergency power backup.
Comply with international standards and certifications
This LFP batteries have passed CE, UN38.3 and other certifications.
High reliability system
Adopt high-performance processor and ensure the stable operation of the system
based on the three-level management mode;
Real-time monitoring of system conditions, providing short-circuit protection,
reverse connection protection, high-voltage protection, low-voltage protection,
charging over-current protection, discharge over-current protection, over-charge
prote ction, ove r-di scharge protecti on, hig h-temperat ure protection, low-
temperature protection, cell balance and other functions.
Powerful communication features
Configure a variety of communication interfaces: USB, RS485, 4G, CAN, you can
know the battery working status at any time through the host computer;
3.1 Introduction
Figure 3-1 Battery module panel appearance
2.5 Mechanical Safety
Removing Heavy Objects Safely
3.2.1 Battery module front panel schematic
3.2 Battery module

910
3.2.2 Battery module dimensions
Figure 3-2 Battery module dimensions
No. Item Parameters
1Nominal voltage/capacity 38.4V/200Ah
2Weight
3Dimensions(W/D/H)
4
AC internal resistance
5
Insulation resistance
Figure 3-1 Battery module Parameters
Part name Quantity
ESS-BM-38.4
-200
3.2.3 Battery module Parameters
Remark
2P12S
Contains the accessories
Tolerance±0.5mm
1000V (DC)
3.2.4 Battery module standard configuration
Specification Remarks
1PCS
Us e Li F eP O 4 ba t te ry, ca p ac i ty
38.4V/200Ah, including BMU, fuse,
with a green LED battery indicator,
insulated coated metal casing.
Input/output
terminal 2PCS DC1000V/350A Terminal
Power
communication
terminal
2PCS
3.3 BPU
3.3.1 High-voltage box front panel schematic
No. COM1 COM2
1CAN_H
CAN_L
GND
V24+
CANGND
NC
24V-
24V+
2
3
4
5
6
7
8
AMP：22011-8AW-1,
The pins of COM1 and COM2 have the
same definition, and both contain one
CAN, and one 24V power supply.
CAN_H
CAN_L
GND
V24+
CANGND
NC
24V-
24V+

11 12
3.3.3 BPU standard configuration
3.4.1 Battery rack figure
3.3.2 BPU dimensions
Part name Quantity
BPU
Specification Remarks
1PCS
Input/output
terminal 4PCS DC1000V/350A Terminal
Power
communication
terminal 3PCS Includes CAN, RS485, 24V power supply;
No. COM1 COM2
124V- 24V-
2 24V+
24V+
3NC 485_A
4
CAN1_H
5
NC
CAN2_H
6
7
8
CAN1_L CAN2_L
CANGND RX_232
NC TX_232
24V-
24V+
EX485_A
485_B EX485_B
Relay4
Relay5
Relay6
EGND
COM3
AC220V
Terminal 1PCS AC220V
3.4 Battery rack
Figure 3-3 Battery rack dimensions
Note: Please refer to the BCxx Battery Easy Installation Manual for the specific
dimensions and design layout of the battery rack.
3.5.1 Battery cabinet appearance
3.5 Battery cabinet
Figure 3-4 Battery cabinet dimensions
Contains control mainboard (BCU),
power board, fuse, relay, one LED with
red and one LED with green, using
insulated coated metal housing.

13 14
5.1 Transportation and Storage
3.5.2 Battery cabinet detailed layout
Note: Please refer to the BCxx Battery Easy Installation Manual for the specific
dimensions of the battery cabinet.
The main components of the BC series energy storage battery cabinet system are
shown in Table 3-2 below.
3.5.3 Battery cabinet configuration
Table 3-2Main components of BC battery energy storage system
No. Name
1
2
3
Battery module
Battery rack
Battery cabinet
4BPU
Please refer to the "BCxx Battery Easy
Installation Manual" for the specific quantity.
Operating environment 4
Battery operating environment requirements are as follows
Working temperature: 0 ° C - 45 ° C;
Relative humidity: 5% - 95%, non-condensation
Altitude: ≤2000m;
On-site environment: keep away from heat sources, avoid direct sunlight, no
corrosive/ explosive gas or gas that might damage the insulation, no conductive dust
that might damage the insulation.
Transportation and
storage requirements
5
The battery module and racks should be transported separately. Pay attention to the
identification on the packing box when transporting and storing the product. The
storage location should be:
 No corrosive gas around
 No excessive humidity and high temperature source
 No dust environment
 In line with fire protection requirements
 Short-term storage (one month), recommended storage temperature is 20℃~45℃
 Long-term storage (1 year), it is suggested to store in 0℃~35℃ environment
temperature and clean, dry and ventilated indoor environment. Avoid contact with
corrosive materials and stay away from fire and heat sources.
 Ambient humidity＜70%
During transportation, handling and installation:
 Avoid collision of parts or parts with objects such as doors, walls, and shelves
 Wearing neat gloves, it is strictly forbidden to touch parts with bare hands, sweaty
or dirty gloves.

15 16
5.2 Transporting
User can lift the whole package box from the bottom by means of a forklift and can
transport it independently, as shown in 5-1.
Only those who have received training in the power system and have a good
knowledge of the power system are allowed to install the device. Always follow local
safety regulations and the safety requirements listed below during installation.
Before installing or removing the device, make sure that the power system is not
powered and that the battery device is turned off. Distribution cable routing should
be reasonable and protective, to avoid touching these cables when operating the
power supply.
Figure 5-1 Forklift use reference diagram
Device installation and configuration 6
6.1 Installation preparation
6.1.1 Safety regulations
6.1.2 Check the operating environment
The operating environment shall comply with the requirements described in Chapter
4, “Operating Environment”. If it does not, it shall be rectified and the operating
environment shall be re-examined.
6.2 Tool Preparation
Table 6-1 Installation tool table
No. Name Quantity
1Wrench 4
2
Warning band
10
3
Herringbone
ladder (1.9m)
4
5
6
Helmet 6
Gloves
(DC insulation) 4
Insulated shoes 6
12-inch
Rubber road cone
70CM reflective
2
Wide pedal
herringbone ladder
1.9m
3M
Thickened
anti-electric
3M
Model Remark Legend
plastic handle
(with scale)
High 70CM
bottom 44×44CM
Glass reinforced
plastics conventional
red
Multimeter 21kV range
Clamp ammeter 2 2kA range
Elevator Lifting height
of 2.2M or more
1
7
8
9
10
11
Sleeve Interchangeable
2
Tape measure 100M
1

17 18
Before the battery module is ready for installation, an unpacking check is required,
mainly to check the following:
 Check whether the number of items in the packing list matches the actual items;
 Check whether the documents and accessories are complete;
 Check whether the battery module case is deformed, painted or loose.
Take photos before and after unpack the packing. If the number of items is the same
as the packing list, sign the confirmation packing list with the customer.
If the equipment is damaged or corroded during the unpacking inspection process, it
should be promptly reported. Place the battery module in the corresponding position of the battery rack according
to Figure 6-2, and fix the battery module to the battery rack with the matching M6
screw.
No. Name Quantity
12 Forklift 2
13
Electric drill
2
14 insulation
resistance meter
Interchangeable
Interchangeable
1 nterchangeable
Model Remark Legend
6.3 Unpacking inspection
6.4 Preparation before installation
>Make sure all the BPU switches are in the OFF state;
> cut off all relevant equipment power supply;
6.5 Battery module installation
1）Before install the battery module, check that the battery rack is properly installed
and grounded.
2）Take the battery module out of the box.
3）Determine the installation position of the battery module according to the label
of the battery module(as shown in Figure 6-1, the 4 digits are the installation
position of the battery module, 0101 indicates the first position of the first rack, and
0211 indicates the 11th position of the second rack) .
Figure 6-1 Diagram of the battery module label (picture is for reference only)
Figure 6-2 Installation diagram of the battery module(picture is for reference only)
M6*20

2019
Wear protective shoes when assembling energy storage systems;
 Staff long-sleeved shirt. It is forbidden to wear sleeveless shirts and it is forbidden
to roll up the sleeves;
 All personnel involved in the work wear appropriate gloves;
 The battery module is about 60kg depending on the model. It is forbidden to move
by one person to prevent personal injury.
 Each battery rack is 4 columns, 6 layers. After installation, check the installation
order and position of each rack of battery modules. It is forbidden to mix modules of
different racks.
 The torque of the battery module locking bolt is 12Nm.
6.6.1 Connecting ground
 Each battery rack is 3 columns, 5 layers. When connecting DC cables, connect the
battery module of each column in series, and measure the voltage of each column of
the battery module with a multimeter. If there is no abnormality, then string the two
columns of battery packs.
 After all the batteries in the rack are connected in series, use the insulation meter
to measure the insulation level between the positive electrode of the battery rack
(the positive electrode of the battery module 1) and the battery rack, and the
insulation level between the negative electrode of the battery cluster (the negative
electrode of the battery module 14) and the battery rack. The insulation should be
more than 100Ω/V.
 After the DC cable is connected, tap the cable plug connector with a rubber
hammer to ensure that the cable is securely installed.
Figure 6-4 Battery rack DC cable wiring diagram (picture is for reference only)
Figure 6-3 Schematic diagram of the series DC cable (picture is for reference only)
Precautions:
6.6 Electrical connections
Grounding resistance needs to be less than 1Ω；
6.6.2 Battery module DC cable wiring
1) Take out the matching series DC cable as shown in Figure 6-3 and separate the
series DC cables according to the cable labels.
2) According to the wiring position of Figure 6-4, connect the No. 2 series DC cable
to each cluster first, then connect the No. 1 serial DC cable, then connect the
No. 4 serial DC cable, and finally connect the No. 3 cable.
3) Connect from bottom to top during wiring to prevent misconnection and
shorting.
Demonstration of installation examples：

21 22
6.6.3 Battery module communication cable wiring 6.6.4 BPU wiring instructions
After the power line and communication line inside the battery cabinet are
connected, install the inverter according to the inverter manual, and connect the
battery input end of the inverter to the DC output end of the battery BPU, and output
of the BPU COM2. The line is connected to the CAN communication input port of the
inverter.
Figure 6-5 Battery module communication cable diagram (for reference only)
Figure 6-6 Battery rack communication line wiring
diagram (for reference only)
Figure 6-7 Schematic diagram of the BPU wiring
with the energy storage system, for reference only
6.7 Post-installation check
After the installation of the energy storage system is completed, post-installation
inspection is required:
 The battery rack and the battery module are aligned with the mounting holes, the
screws are tightened, and the torque meets the requirements (12Nm);
 The battery module number and installation location are the same;
 Check whether each communication cable interface is secure and the single small
wire harness is loose before installation.
 Check the screws of each interface after installation to confirm whether it is
tightened.
Precautions:
2) According to the wiring position shown in Figure 6-6, each rack is connected
to the battery module communication line in S-shape from the lower right corner.
1)Take out the matching battery module communication line as shown in Figure 6-5
and sepa rate the com munication line accordin g to the battery module
communication line label.

23 24
Battery module LED indicator description 1
6.8 Power on
6.8.1 System power supply instructions
Inside the container system, there are two ways to take power from the battery
system. One is to take power from the total voltage of the battery module, and the
other is to take power from the external isolated AC. In the case where both power
supplies occur at the same time, the AC power supply is preferred.
If it is an off-grid system with single battery rack, the battery system will be powered
by the total voltage of the battery module, and either grid-tie single machine or
container could be AC power supply.
6.8.2 System power-on instructions
1) Before powering on, please check whether the battery power line and
communication line are consistent with the instructions in the installation manual;
2) After confirming that there is no problem with the wiring, you can first dial the
POWER SW, close the DC power switch, and the system is powered on;
3) then turn the 220V SW up and close the AC power switch. At this time, if the AC
has power supply, the system will switch to AC power.
6.9 function operation and testing
No. status Description
1
2
3
4
LED: Constantly bright
LED: 1S flashing cycle
LED: 250ms blinking cycle
LED: 5S flashing cycle
Acquisition failure
Open battery
Normal communication
Standby (no external communication)
BPU LED indicator description 2
No. status Description
1
2
3
4
Mode green light: 3s flashing
cycle - slow flashing
Alarm red light: often off
Mode green light: 1s flashing cycle
Alarm red light: 1s flashing cycle
System standby
Trouble free
charging
First level alarm
Mode green light: 2s consecutive
flashes Discharge state
Alarm red light: 2s consecutive
flashes Secondary fault
Mode green light: always bright system error
Alarm red light: 3s flashes in
succession Tertiary fault
Special note: When wiring the COM port of the BPU, please pay attention to the line
mark on the connection line, beware of incorrect wiring.
-- - End of installation —

25 26
7.1 Electrical and Fixed Parts Connection
Appendix A
FAQ
Q. After closing the POWER SW switch, the battery system has no output.
A. Observe the status of the battery module and the BPU LED lamp;
1) If some of the cabinets are not lit, it is necessary to confirm whether the cabinet
with the last LED light is connected to the next cabinet without the LED light and the
communication line connected to all the cabinets without the LEDs is incorrect. Or
missing the connection, or even the communication line is damaged;
2) If all the cabinets are not lit, it indicates that there is a problem with the power
supply of the system. It is necessary to check whether the power line of the rack
system is incorrectly wired or missing. If there is no error in the power wiring, then
the BPU needs to be opened to check whether the power circuit is faulty.
3) If all the cabinet LED lights are on, you need to check the fault according to the
battery module and the BPU indicator.
Q. What should I do if the indicator light of the BPU shows the first level alarm, the
second level protection, and the third level protection?
A, 1) Level 1 alarm: The system is running normally without any action;
2) Two-level fault: the battery system has no action and the inverter is standby;
3) Three-level fault: The battery system cuts off the main circuit relay. Inverter
shutdown
4) If there is a system failure, you can first view the fault type information on the
operation data page on the inverter display, if the fault type information is viewed on
the display of the battery system.
7 Maintenance
After the equipment is put into operation, it is necessary to regularly check the
electrical and fixed parts of the equipment. It is recommended to check every two to
three months. Every time you check, you need to make a record.
Test result
Visual inspection
isual inspection
nterchangeable
Inspection Method
 Normal □abnormal
Remark
DC cable connection
between battery packs
Communication cable connection
between battery packs
□Normal □abnormal
□Normal □abnormal
□Normal □abnormal
Power supply input connection
outside the BPU
Battery rack ground connection Visual inspection
No. Check item
1
2
3
4
7.2 leaning
Before the equipment is put into operation, the debris and stains that may be left
inside the equipment and the outer casing should be cleaned. After the equipment is
put into operation, the internal dust of the container should be cleaned regularly,
and the ventilation and exhaust facilities should be checked for normality. It is
recommended to clean it every two to three months.
Common troubleshooting 8
8.1 Fault and abnormal state processing

27 28
8.2 Annex B
The system has the following second and third level fault information description
Fault level Fault description Remarks
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
To be determined
To be determined
To be determined
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
High secondary charging temperature
High secondary discharge temperature
Low secondary charging temperature
Low secondary discharge temperature
Large temperature difference between the two
Secondary total pressure
Secondary total pressure
Large total pressure difference between the
two stages
High secondary cell voltage
Low secondary cell voltage
Large voltage difference between the two cells
Large secondary discharge current
Large secondary discharge current
Secondary
fault
Fault level Fault description Remarks
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
Adjustable
To be determined
To be determined
To be determined
Adjustable
Adjustable
Adjustable
Three-level charging temperature is high
Three-level discharge temperature is high
High temperature protection recovery value
Three-level harging temperature is low
Three-level discharge temperature is low
Low temperature protection recovery value
Three-level of temperature difference
Three-level total pressure
Three-level total depression
Three-level total pressure difference
High level three-level voltage
Low level three-level voltage
Three-level charging current is large
Tertiary fault
Adjustable
Adjustable
Three-level discharge current is large
Tertiary fault

Annex
9
No.
1
2
3
4
5
Category Circuit breaker
maintenance
Software diagnostics
Check item Software version System alarm Whether circuit breaker(CB) of DC
cabinet in parallel system trips
Whether DC Micro breaker(MCB) of
BPU trips
Check method Visual inspection Visual inspection BMS data reading
or screen
BMS data reading
or screen
Battery consistency Whether the indoor or container
ambient temperature is 20  ~ 40
 , and whether the temperature
c o n t r o l e q u i p m e n t i s i n g o o d
condition
BMS data reading
or screen
Standard CB all connected MCB all connected Record the
software version
No alarm in the
alarm bar
The static
differential
pressure shall be
within 20mV
Thermometer 20℃~30℃
6
Result
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Problem
description Check frequency
Once two weeks
Whether the temperature of battery
module is normal, and whether the
maximum temperature difference
between modules is less than 5 
7
BMS data reading
or screen <5Normal
Abnormal
Whether the voltage of each cell in
the system is normal, and whether
the maximum voltage difference
between each battery is less than
100mV
BMS data reading
or screen <100mV Normal
Abnormal
8
System operation
status and
environment
No.
10
11
12
13
Category
System cleaning
Check item Check the fault page of the display and check
whether the battery system reports
abnormal information
Status of the air condition in container
Check method
Visual inspection,
thermometer
Smell
DC cable connection between battery
boxes
Standard No fault record 25±3℃ No abnormal
sound or smell
No water leakage
or foreign matters
Visual inspection
/thermometer
14
Communication connection between
battery boxes
15 Visual inspection
/BMS fault record
No CAN
communication
fault
E x t e r n a l p o w e r s u p p l y i n p u t
connection of high voltage box Visual inspection,
recommended to
take pictures
AC circuit breaker
remains closed
16
Circuit connection
BMS data reading
or screen
9
Whether the battery module and battery
rack have abnormal sound or smell
Is there water leakage or other foreign
matter in the room or container Visual inspection
Whether there are rodents and insects
such as mice, geckos, cockroaches and
ants in the room Visual inspection No animals or
insects
No obvious
heating
or temperature
below 70 ℃
Battery rack ground connection Visual inspection,
multimeter
<=4
17
Result
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Problem
description Check frequency
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
System inspection and Maintenance Checklist
Once two weeks Once two weeks Once two weeks Once two weeks Once two weeks

No.
18
19
20
21
Category Circuit breaker
maintenance
Fan maintenance and
replacement
Check item Check whether the power cable plug is
loose or not tightened, and whether the
power cord surface is damaged
C h e c k w h e t h e r t h e p l u g o f
communication cable is loose or not
tightened, and whether the surface of
communication cable is broken
Check method
I f t h e f a n h a s a n y a b n o r m a l
condition, it shall be replaced in time
Standard No damage No crack on blade
22
Result
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Normal
Abnormal
Problem
description Check frequency
Is the indoor or container lighting
system in good condition
23 Normal
Abnormal
Is there any fault in the DC cabinet or
BPU in the parallel system or the red
light flashes
Normal
Abnormal
24
System operation
status and
environment
Visual inspection
Listen to whether there is abnormal
vibration sound when the fan is
running
Hear,spanner,
screwdriver, etc
Visual inspection Visual inspection No loose or
fracture
Check the fan blades for cracks
25
Fi re fi gh ti n g f a ci li t ie s i n go o d
condition Visual inspection
Visual inspection Visual inspection Visual inspection
No abnormal
sound
No abnormality Normal lighting No red light
flashing in fault
record
Fire fighting
facilities not
expired
Normal
Abnormal
Once two weeks Once two weeks Once two weeks