BYD Battery-Box Pro series Instruction Manual

BYD Battery-Box PRO
Service Guideline
Version 1.0
Valid for PRO 2.5-10.0 and PRO 13.8
Important:Theinstallation and allotherkindsofworks or measurementsincombinationwiththeBattery-Box
are only allowed by professional and qualified electricians.
This manual is a shortened assistance for the installation / service of the Battery-Box PRO and does not replace
the original manual, which can be found on www.alpspower.com.au or www.byd.com. The installation must
be carried out by a trained and qualified electrician. Attention: High Voltage! Improper handling can cause danger
and damage.

2
CONTENT
CONTENT 2
1. CHECK INSTALLATION 3
1.1 System Components and general protection mechanisms 3
2. ERROR ANALYSIS 5
2.1 Installation or commissioning issues 5
2.2 Battery shutdown or inverter reports battery failure 6
2.3 Unusual behavior of a working system 8
3. SERVICE TASKS 9
3.1 Voltage measurement 9
3.2 Emergency charge 9
3.3 Battery information Query and Read Alarm history 9
3.4 Software update 9
4. SERVICE CONTACT 10

3
1. CHECK INSTALLATION
Please proceed first with the installation steps by:
No.
Name
Description
0
Inverter installed
Please make sure that the connection between the Battery-Box and the inverter
correctly?
and the installation of the inverter have been carried out correctly. If in doubt,
follow the instructions of the inverter manufacturer.
IMPORTANT: Please install the latest software on the inverter.
1
Configuration
Please double check if your system and application is according to the Compatible
Inverter List of BYD (available at www.alpspower.com.au)
Please check the software version of the inverter is at least the minimum version
stated in the compatible inverter list of BYD (available at
www.alpspower.com.au)
2
DC Power Cable
Make sure that +and -are properly connected.
3
Communication cables
Please check:
-In some cases the cable between the battery CAN port and the inverter must be
specially made. Please check the specifications in the installation manual.
- Recommended CAT5 or higher;
- Check the cables and replace them if necessary
- Check if all Cables inside the battery (Battery Modules to BMS) are ok, and
reinsert them if necessary
4
Grounding
Battery-Box connected directly to the ground-bus of the house.
The battery must not be earthed via the inverter! Otherwise, communication
problems are possible.
5
Correct Address
Is the ADDR (address) Switch according to the manual?
1 = 10000
2 = 01000
3 = 11000
4 = 00100
...
6
Correct Restart (!)
Has the system been restarted correctly before commissioning? During the restart
process there should not be any LED blinking or on! (Important! The BMU and BMS
LEDs must be off completely.)
7
Checking the correct
The system runs properly if:
operation
-BMU LED is constant green
- BMS of battery shows constant green or charging / discharging
- No error messages on the inverter
- Inverter displays SOC of Battery correctly
- System charges / discharges
IMPORTANT: If you can not complete the commissioning, then turn off the battery before you leave the site.

4
1.1 System Components and general protection mechanisms
The Battery consists of the BMU, Cables, BMS and Battery Cells.
The BMU manages the communication between the inverter and all the batteries in the system. The BMU reports the safe
working limits, battery status and battery alarms to the inverter. Therefore, if communication is not established correctly or lost
the BMU will shutdown all the batteries. Only one BMU is needed and in use for one battery cluster. (See installation manual)
The BMS is included in each battery module (B-plus 2.5) or in each cabinet (B-Box 13.8). The BMS balances and protects the
battery cells and reports status and alarms to the BMU. In the case that an alarm is present and the BMU fails to protect the
system, the BMS may shutdown the battery as a precaution.

5
2. ERROR ANALYSIS
Please refer to the general steps before proceeding, see chapter 1.
If you are having problems with the installation or commissioning please refer to section 2.1
If one or more of the batteries has shutdown or stopped working please refer to section 2.2
If a working system is misbehaving please refer to section 2.3
2.1 Installation or commissioning issues
An installation will be successful when the
battery detects the inverter (represented by
a solid GREEN RUN LED in the BMU-diagram
in the right), the inverter detects the battery
(In general you will be able to see BYD
B-Box in the inverter interface) and the
battery is capable of charging and
discharging for at least 5min.
If the above is not true please take a look at the number of times the BMU RUN LED is blinking. Please note in
most cases this is not related to the battery software so please review the installation first.
NO.
Blin
k
Cause
Corrective measures
1
BMU cannot
communicate with
inverter
1. Review in detail the commissioning steps in the inverter manual
2. Confirm you are using the CAN cable recommended in the BYD
and inverter manual
3. Exchange the cable between the BMU and Inverter
2
BMU cannot
communicate with any
battery
1. Check the addresses of all the modules
2. Replace the communication cable between the BMU and the first
battery
3
BMU cannot
communicate with one
/ some batteries
1. Check if any battery has a green side to side scrolling light
2. Put the address to 00000 and change back to the correct address
3. Replace the communication cables between batteries
4
Battery Damage
1. Check how to proceed with RED LED below
If the communication problems persist please try to commission the system with 1 battery only and if it is
successful add the batteries gradually to the system until you identify the one that doesn't communicate. If the
problems persist please try a different BMU or a different master inverter if available.
Always do a correct restart (all LEDs have to be completely off (also no blinking) - this can take some minutes)

6
2.2 Battery shutdown or inverter reports battery failure
Yellow ARM light: Temporary issue → The system or the user can take action to correct it
If the yellow light doesn’t disappear after a few minutes please review the electrical
installation according to the below legend.
Alarm:
If the yellow ARM light is on, shortly press Reset (ON/OFF) Button and observe how often the LED blinks
NO.
Blink
Cause
Corrective measures
1
Cell or B-plus Undervoltage
Charge
2
Charge overcurrent
Close the input and check it.
3
Charge overcurrent in the low
Temperature
Reduce the charging current
4
Charging short circuit
Eliminate short circuit
5
discharging short circuit
Eliminate short circuit
6
Parallel short circuit
Eliminate short circuit
7
Discharge overcurrent
protection
Close the load. Check the load power.
8
High temperature protection
Power off the system. Find the cause of the high temperature. Open
the exhaust fan or air conditioner to cool down.
9
Low temperature protection
The temperature is too low to turn on the heating up
10
overvoltage protection
discharge.

7
Red ERR light: Permanent issue → A component might have been damaged
For 2.5 please see below table and report to your local service partner
For 13.8 we need to confirm if the issue is in the battery, BMS or sampling cable before
reporting to the local service partner.
For this purpose we recommend the following test: Change BMS A from Battery A (with
error) to Battery B and BMS B to Battery A. Keep the sampling cables in the same battery.
- If the error stays in the same battery, either the cabling or the batteries might be faulty
- then do the same with the cabling - and exchange this with the other tower.
- If the error moves with the BMS, probably the error is inside the BMS
- If the error disappears it was probably from a loose contact between cables.
Error:
If the red ERR light is on, shortly press Reset (ON/OFF) Button and observe how often the LED blinks
No.
Blin
k
Cause
Corrective measures
1
Voltage sensor failure
Read the history alarm information. Check that the sampling line is in
good contact.
2
Temperature sensor
failure
Read the history alarm information. Check that the sampling line is in
good contact.
3
Charging circuit failure
Read the history alarm information.
4
Discharging circuit failure
Read the history alarm information.
5
cell brokened
Read the history alarm information
6
536 Communication failure
Read the history alarm information.

8
2.3 Unusual behavior of a working system
Case 1: Current too low
If available please check the charge/discharge current limit from the inverter data. This value
is provided by the battery to the inverter. This value may vary depending on the
circumstances, such as SOC close to 0% or 100%, alarms or temperature below 12 degrees
(See User manual for details on derating).
If the real current is below the current limit set by the battery please check the remaining
components in the system
Case 2: Battery cannot charge/discharge
Please follow the recommendations for case 1 first. When to charge or discharge is decided
by the inverter with the data provided by the meter or CT clamp. Please check if those
components are communicating properly and no alarms are present. Alternatively check with
the inverter provider regarding the correct working modes and parameters for your
installation.
Case 3: Abnormal SOC or SOC jumps
There can be two causes for this issue.
Lack of calibration: LFP batteries have a very stable voltage curve and only show meaningful
changes of voltage when SOC is close to 0% or 100%. Therefore, it is important to let the
batteries charge completely with certain regularity. One time should be enough but if the
problem persists please perform several full cycles from close to 0% SOC until 100% SOC.
Small loads for a large period of time: Some devices in an energy storage system are
powered by the batteries. Most of these devices have a very low power consumption. There
is a limit to the current measurement precision of the batteries, any load below that will not
be measured so it will not have an influence in the SOC calculation. Therefore, if the system
is idle or under a very small load for a long period of time it is possible that the SOC shown
is not the real one. Once that occurs please perform a calibration cycle.

9
3. SERVICE TASKS
In some cases you might be asked to perform additional measurements or tasks to solve a service case
3.1 Voltage measurement
ATTENTION: High voltage!
The nominal voltage modules by 50V.
Measure Voltage on BMS (should be about 50V):
PRO 2.5-10.0 (B-PLUS 2.5): PRO 13.8 (BMS):
For PRO 13.8: If the measured voltage deviates significantly from the nominal value, please measure the voltage
directly on the two battery modules DC ports. (Nominal voltage per battery should be around 25 V).
3.2 Emergency charge
See emergency charge guide
3.3 Battery information Query and Read Alarm history
Manual provided by Service partner
3.4 Software update
Manual provided by Service partner

10
4. SERVICE CONTACT
Please note that this document is intended as a quick reference guide to quickly resolve common problems.
Further information and detailed installation assistance can be found at www.alpspower.com.au .
To ensure a smooth process, please register yourself and the system under www.alpspower.com.au
For further help please contact:
ALPS Power
Mail: [e-mail]
Phone: [phone]
IMPORTANT:
In order to be able to process a service case, it is absolutely necessary to get the serial number of the Cabinet /
BMS and all error-specific information, see the table below:
No.
Name
Description
A
SerialnumberCabinet/
BMS / Module
At the cabinet or on the BMS
B
Photos
Photos showing inverter errors / cabling / setup
C
Video
Video that shows the LED behaviour
D
Voltage
Voltage of the Battery according to Section 3.1
E
Serial number of the faulty
module
(Note:only necessary,ifa
faulty module was found!)
On the module directly
F
Inverter serial number and
model
Important for BYDto analyze and resolve the problem at system level with the
inverter partner.
G
If necessary: Delivery
address
If replacement parts are required we need:
- Complete delivery address (including country)
- Contact person
- Telephone number
- Email address
H
Additional information
If available, please support us with additional information (eg comments /
informationdisplayedoninverter / additionalphotosofthesystem / ...).
I
Inverter Error Messages
Please record all inverter error messages - if possible with pictures, or Data sets
J
Inverter Portal Access
In some cases it can be helpful to get access to the inverter portal