BYD B-BOX 2.5 User manual

B-Box Professional user manual
B-Box Pro 2.5~10.0
User Manual
20170323
Version: 2.2
Copyright © BYD Company Limited. All rights reversed.
Without the written consent of BYD Company, any entity or individual shall not extract, copy contents
of the document, it is not allowed to be translated in any conditions.

B-Box Professional user manual
Statement:
The product version update or other reasons for changes should be subjected to adjust on the
condition of BYD’s notice. Unless otherwise agreed, the document used as guidance only, all
statements information and suggestions in this document do not constitute any expression.
You can contact BYD side if you have any questions.
BYD Lithium Battery Company Limited
TEL: [phone]
FAX: [phone]

Page 3
Contents
1 General Information .........................................................................................................................4
1.1 About this manual ................................................................................................................................ 4
1.2 Target Group ........................................................................................................................................ 4
1.3 Intend usage ......................................................................................................................................... 4
1.4 B-BOX and B-Plus definition ................................................................................................................. 4
1.5 Identifying the Product......................................................................................................................... 4
2 Safety..................................................................................................................................................5
2.1 Safety precaution ................................................................................................................................. 5
2.2 Safety guidelines for installation .......................................................................................................... 6
3 Technical parameters ......................................................................................................................7
4 Technical noun explanation ...........................................................................................................8
5 Product overview..............................................................................................................................9
5.1 B-BOX System Brief introduction.......................................................................................................... 9
5.2 B-BOX configuration table .................................................................................................................. 10
5.3 B-BOX System diagram ....................................................................................................................... 11
5.4 General introduction of BMU ............................................................................................................. 11
5.5 General introduction of B-Plus 2.5 ..................................................................................................... 12
5.5.1 B-Plus 2.5 brief introduction ........................................................................................................ 12
5.7 B-Plus 2.5 address switch introduction .............................................................................................. 13
6 Cleaning and maintenance ...........................................................................................................14
6.1 Cleaning .............................................................................................................................................. 14
6.2 Maintenance ...................................................................................................................................... 14
7 Dispose special situation..............................................................................................................15
7.1 Battery over discharged maintenance ............................................................................................... 15
7.2 Force Majeure .................................................................................................................................... 15
8 BOX CONFIGURATION LIST with different inverter.................................................................15
8.1 B-BOX configuration list with SMA sunny island-On/Off grid ............................................................ 15
8.2 B-BOX configuration list with GOODWE ES-On/Off grid..................................................................... 16
8.3 B-BOX configuration list with GOODWE BP-On grid........................................................................... 16
8.4 B-BOX configuration list with Victron Multiplus/Multigrid-On/Off grid............................................. 16
8.5 B-BOX configuration list with Solax -On grid ...................................................................................... 17
9 Normal issues and solutions........................................................................................................18
9.1 Normal alarm and solution display on SMA sunny island SRC ........................................................... 18
9.2 Normal alarm and solution display on B-Plus 2.5............................................................................... 19
9.3 Normal alarm and solution display on BMU ...................................................................................... 19
10 Warranty.........................................................................................................................................20
11 Login in after service web...........................................................................................................20

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1 General Information
1.1 About this manual
This user manual introduces the B-Box product information, using guidance, safety caution items and normal
failure and actions. Users can contact with the after service center if had any abnormal failure or urgent
occurs.
1.2 Target Group
This user manual is applied for the B-BOX 2.5, B-BOX 5.0, B-BOX 7.5, and B-BOX 10.0.
1.3 Intend usage
The B-BOX can be used in household energy storage application, includes on/off-grid system. When B-BOX
works with different inverter, user should refer to the configuration list with the approved inverters brands
which are suggested by BYD.
1.4 B-BOX and B-Plus definition
BYD battery box productsB-Box2.5~B-Box10.0 are defined as below:
B-Box: Battery Box
B-Plus2.5: battery unit with nominal capacity is 2.56KWh, will be installed inside the cabinet as an energy
storage module.
B-Box2.5: Battery nominal capacity is 2.56 KWh (Includes 1pcs B-Plus2.5)
B-Box 5.0: Battery nominal capacity is 5.12 KWh (Includes 2pcs of B-Plus2.5)
B-Box 7.5: Battery nominal capacity is 7.68 KWh (Includes 3pcs of B-Plus2.5)
B-Box 10.0: Battery nominal capacity is 10.24 KWh (Includes 4pcs of B-Plus2.5)
1.5 Identifying the Product
The Type Label describes the product identification, which is attached on the product. For safe usage, the
user must be well-informed of the contents in the Type Label. The Type Label includes:
Product Name：
Product Type：
Rated output voltage:
Rated current:
Operation temperature range:
Serial Number (P/N No.)：
Caution：
Certification marks：

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2Safety
2.1 Safety precaution
Warning, notice and caution
Users are kindly requested to use the battery which is delivered from BYD Lithium Battery Company Limited
in strict accordance with the Datasheet and remarks include at the end of this document.
BYD Lithium Battery Co., Ltd. will not guarantee the use of this data sheet outside of any accident.
WARNING
Do not crush, dispose according to safety regulations (Do not dispose in fire or water).
Recharge Battery at least every 6 months (when in storage).
Once discharged, recharge battery within 7days
Do not expose to temperatures above 55℃,and keep out of direct sunlight.
Ensure reliable grounding.Do not reverse the front panel..
Do not short, reverse polarity or connect in series.
Disconnect from power and load before maintenance.
May only be operated by qualified professionals.
Storage according to related standard.
Do not put one battery on another when unpackaged.
In the process of transportation and storage, the goods are not allowed be stacked at a height or layers
above the specification.
When Increase the battery, should power off the battery and other power input first.
B-BOX product only can be used in home energy storage application, and it is not allowed for life-sustaining
medical devices and automotive application.
NOTICE
Inadvertent operation of damaged B-Box can lead to a dangerous situation that may result in serious injury
due to electrical shock. Only can operate B-Box when it is technically faultless and in an operationally safe
stat.
Regularly check the B-Box for visible damage. Making sure that all safety equipment is freely accessible at
all time. If B-Box is damaged, do not touch it.
Please contact BYD after service supplier if a significant event message displays on LCD or APP of inverter.

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CAUTION
Li-ion battery inside, when disassembling the system, do not intentionally short the positive (+) and negative
(-) terminals with metallic objects.
All works on system and electrical connections must be carried out by qualified personnel only. B-Box
provides an emergency switch when for urgent situation.
A potentially hazard circumstance such as excessive heat or electrolyte mist may occur due to incorrect
operation, damage, abuse. The safety precautions and the warning messages described are not fully
understood, or if you have any questions, please contact after service for guidance. The safety section may
not include all regulations for your locale.
Personnel working with B-Box must review applicable federal, state and local regulations as well as the
industry standards regarding this product.
When transport the system with package type, remove the battery from cabinet and transport them
separately.
2.2 Safety guidelines for installation
CAUTION:
Li-ion battery (energy storage unit) inside. When assembling the system, do not intentionally make a short
condition between the positive (+) and negative (-) terminals of the battery box with a metallic object.
All works on the B-Box and electrical connections must be carried out by qualified personnel only.
B-Box provides a safe source of electrical energy when operated as intended and as designed.
Potentially hazardous circumstances such as excessive heat or electrolyte mist may occur under improper
operating conditions, damage, misuse and abuse.
The following safety precautions and the warning messages described in this section must be observed. If
any of the following precautions are not fully understood, or if you have any questions, contact customer
service for guidance. The Safety Section may not include all regulations for your locale; personnel working
with B-Box must review applicable federal, state and local regulations as well as the industry standards
regarding this product.
Installation personnel cannot wear watches, etc., to avoid short circuit and man-made damage.
CAUTION:
Due to heavy weight of BYD B-Box 2.5~10.0, please use strong package and do safety protection during
transportation, and make sure to the safety to avoid man-made damage.

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3Technical parameters
When B-BOX works in different temperatures, charge and discharge current will be adjusted automatically,
detail parameters setting please refer to below table:
Parameter setting of charge current in various temperature
Protect temp./Resume temp.(℃)
Normal current(A)
-7~2
0.06C*N
2~12
0.12C*N
12~50
0.7C*N
Remark:
1.Effective time is 2mins when change from one temperature range to another.)
2.N=B-Plus2.5 battery quantity
Discharge current control with temperature
Protect temp./Resume temp.(℃)
Normal current(A)
-20~50/(-15-50)
0.7~1C*N
Remark:
1.N= B-Plus2.5 U battery quantity
B-Box Pro 2.5
B-Box Pro 5.0
B-Box Pro 7.5
B-Box Pro 10.0
Battery Type
Lithium Iron phosphate battery
Battery module
B-Plus2.5
Nominal Battery Energy
2.56
5.12
7.68
10.24
Output power(KW)
Max 2.5
Max 5.0
Max 7.5
Max 10.0
Usable battery energy(KWh)(0.2C
charge &discharge at @+25℃)(KWh)
2.45
4.90
7.35
9.80
Nominal voltage(V)
51.2
Operating Voltage Range(V)
43.2~56.4
Ambient Temperature Range( )
-10~+50
Communication
RS485/CAN
Cabinet Net Dimension(W*D*H
mm)(Without ground feet)
600* 510* 883
Net Weight(Kg)
79
113
146
180
IP level
IP20

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4Technical noun explanation
No.
Terms
comment
1
Discharge
Battery output power for load
2
Charge
Battery power supply(such as DC charger)
3
Full charged
Battery had been full charged, SOC is 100%.
4
Idle
Battery is on status of neither charge nor discharge and had not full
charged.
5
Shutdown mode
Power off
6
SOC
State of Charge
7
SW
Software
8
HW
Hardware
9
Battery voltage
The voltage between B+/B-
10
Pack voltage
The voltage between P+/P-
11
Cell voltage
Single cell voltage
12
Failure
Battery or BMS are broken, and need to change new unit
13
Alarm
Battery will stop charge or discharge immediately
14
Protect
When battery stops charging or discharging (e.g. cell is over voltage), it
is resumable.

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5 Product overview
5.1 B-BOX System Brief introduction
B-Box is the short name of battery box, the energy storage part in the electric power system is
household, and the B-box carries BYD’s lithium battery with excellent performance. There are 1/2/3/4
pcs batteries modules in each box, and the box support parallel connection to expend capacity from
2.5KWh to 80KWh,which can meet various capacity requirement for customers.
Internal drawing
External drawing

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Structure dimension drawing
5.2 B-BOX configuration table
No.
Component
Name
Description
1
Cabinet
B-Box
Cabinet
The Cabinet is used to install the B-Plus 2.5 inside and
provide DC output(Each cabinet can install max 4pcs
B-Plus2.5)
2
Battery
B-Plus2.5
Battery module with 51.2V50Ah, BYD’s P/N is: U3A1-50P-A.
3
BMU
BMU
Battery management unit. Provide communication with
external equipment.
Table 1 configuration list

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5.3 B-BOX System diagram
System diagram
5.4 General introduction of BMU
BMU is battery management unit which installed in cabinet; the function is to manage the battery’s
charge and discharge, select information from battery and report to inverter.
Main function:
✓CAN /RS485 communicate with inverter
✓RS485 communicate with battery/BMS
✓Dry contact terminal
✓Other Communication interface for maintenance
✓Charge and discharge management

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5.5 General introduction of B-Plus 2.5
5.5.1 B-Plus 2.5 brief introduction
B-Plus is the commercial name of BYD U3A1-50P-A backup battery with 51.2V& 50Ah which is designed for
energy storage application. B-Plus 2.5 is an integrated battery which consists of shell, BMS and cells.
B-Plus 2.5 overview
Display and communicate interface
Display and communicate interface
No.
Interface
Mark
Function

SOC LED
SOC
Indicate State of capacity of battery

RUN LED
RUN
Indicate the Plus is running status

ERR LED
ERR ADDR
Indicate error status

ALM LED
Alarm
Indicate alarm status

RJ45 terminal
RS485
Communication ports

Address
ADDR
When parallel connection, need setting address.

Alarm relay output
1.2.3.4
Not using

Test terminal
B- B+
Measure battery voltage when testing.

ON/OFF
ON/OFF
Activity battery when no external power add on battery.
⑩
Display and
communicate interface
GND : Grounded terminal
P-: Negative terminal (DC+)
P+: Positive terminal (DC-)
l

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5.6 Operating environment
Table 5Operatingenvironment parameters
No.
Item
Requirement
Unit
Remark
Min.
Typical
Max.
1
Discharging
temperature
-10
25
50
℃
2
Charging temperature
-10
25
50
℃
3
Humidity
5
95
%
non-condensing
4
Elevation
-
2000
-
m
5
IP level
20
5.7 B-Plus 2.5 address switch introduction
After finished the battery installation, installer should setup battery address by “ADDR” switch.
“ADDR” switch introduction:
Function: Communicate between battery and BMU, BMU will communicate with external equipment when
use CAN communication.
Each DIP switch definition:
There are 6 bit switches, keep the switch on down side means”0”, turn up the switch to “ON” means “1”.
For example: when two battery in using, “ADDR”setting:
No.1 battery address: 100000 No.2 battery address: 010000
Please refer to the configuration list in Appendex1.
Notice: Make sure of the highest address of BMS connecting to BMU which communication with inverter.

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6Cleaning and maintenance
6.1 Cleaning
The B-BOX system is recommended to be cleaned periodically. If the enclosure is in a dirty
condition, please use a soft and dry brush or a vacuum to remove the dirt.
Do not use liquids such as solvents, abrasives or corrosive liquids in the enclosures.
6.2 Maintenance
The B-BOX should be installed in position with the temperature range of -10℃～+50℃.And the humidity is
less than 80%.The load-bearing of battery’s package is less than 300Kg.So don’t let more than 7 modules in
stack.
The capacity of module before delivery is 70%(35AH).So after long time storage the module need do
maintenance. Charge battery with 0.1C (5A) for 5 hours when maintenance.
Storage parameters under different storage conditions-1
Storage
environment
temperature
Relative humidity of
storage environment
Storage
time
SOC
Below -20℃
/
prohibit
/
-20~25℃
5%~70%
≤12 months
30%≤SOC≤60%
25~35℃
5%~70%
≤6months
30%≤SOC≤60%
35~45℃
5%~70%
≤3months
30%≤SOC≤60%
Above 45℃
/
prohibit
/
When SOC is less than 1%,.The module will be damaged after several days if do not charge the module in
time,
Storage parameters under different storage conditions-2
Storage
environment
temperature
Storage time
-20~25℃
≤15 days
25~45℃
≤7 days
CAUTION:
When user needs to clean the B-BOX, please stop the system firstly.

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7Dispose special situation
7.1 Battery over discharged maintenance
When battery over discharge which may cause by black out, continuously rainy day, etc, the battery can
provide limited energy, user should pay attention to the backup time of the battery.
7.2 Force Majeure
Catastrophic accidents, including lightning, floods, earthquakes, fires and other disasters, can bring
unpredictable damage to the whole system.
8 BOX CONFIGURATION LIST with different inverter
8.1 B-BOX configuration list with SMA sunny island-On/Off grid
1 Phase on Grid
Inverter Type
B-Plus 2.5
Cabinets
SI 3.0M
≥1
≥1
SI 4.4M
≥1
≥1
SI 6.0H
≥1
≥1
SI 8.0H
≥1
≥1
Remark: Maximum B-Plus quantity is 32,Cabinet quantity is 8.
3 Phase on Grid
Inverter Type
B-Plus 2.5
Cabinets
SI 3.0M
≥3
≥1
SI 4.4M
≥4
≥1
SI 6.0H
≥4
≥1
SI 8.0H
≥4
≥1
1 Phase off Grid
Inverter Type
B-Plus 2.5
Cabinets
SI 3.0M
≥3
≥1
SI 4.4M
≥3
≥1
SI 6.0H
≥5
≥2
SI 8.0H
≥5
≥2
3 Phase off Grid
Inverter Type
B-Plus 2.5
Cabinets
SI 3.0M
≥8
≥2

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SI 4.4M
≥8
≥2
SI 6.0H
≥12
≥3
SI 8.0H
≥12
≥3
Remark: Maximum B-Plus quantity is 32,Cabinet quantity is 8.
8.2 B-BOX configuration list with GOODWE ES-On/Off grid
1 Phase on Grid
Inverter Type
B-Plus 2.5
Cabinets
4.6kW
≥11
≥1
1 Phase off Grid
Inverter Type
B-Plus 2.5
Cabinets
4.6kW
≥2
≥1
Remark: Maximum B-Plus quantity is 32,Cabinet quantity is 8.
8.3 B-BOX configuration list with GOODWE BP-On grid
1 Phase on Grid
Inverter Type
B-Plus 2.5
Cabinets
2.5kW
≥1
≥1
Remark: Maximum B-Plus quantity is 32, Cabinet quantity is 8.
8.4 B-BOX configuration list with Victron Multiplus/Multigrid-On/Off grid
1 Phase on Grid
Inverter Type
B-Plus 2.5
Cabinets
3KVA
≥1
≥1
5KVA
≥1
≥1
1
This configuration is only for self consumption application.

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1 Phase off Grid
Inverter Type
B-Plus 2.5
Cabinets
3KVA
≥3
≥1
5KVA
≥5
≥2
3 Phase on Grid
Inverter Type
B-Plus 2.5
Cabinets
3KVA
≥3
≥1
5KVA
≥4
≥1
3 Phase off Grid
Inverter Type
B-Plus 2.5
Cabinets
3KVA
≥8
≥2
5KVA
≥12
≥3
8.5 B-BOX configuration list with Solax -On grid
1 Phase on Grid
Inverter Type
B-Plus 2.5
Cabinet
SK-SU 3000
≥1
≥1
SK-SU 3700
≥1
≥1
S K-SU 5000
≥1
≥1

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9Normal issues and solutions
9.1 Normal alarm and solution display on SMA sunny island SRC
SMA SRC
Reason
Solution
F221
External Alarm-Invalid Bat Type
Reset battery type to "Li" on SRC.
F920(XA01General)
1.All the batteries are failed to
communicate at the same time;
2.BMU and battery are failed to
RS485communicate;
1.Inspect whether the RS485 communicate
cable has been connected correctly and
reliability；
2.Inspect DIP switch setting according to the
setting of DIP switch guidance in user manual;
3.Change BMU in cabinet；
F930(XA11Short)
External Alarm - Short circuit
1.Power off;
2.Inspect short connection of cable between
P+&P-;
3.If short connection is confirmed, please
reconnect cable correctly;
4.restart battery;
F952
External Alarm –Ext BMS Timeout
1.Check the CAN communication, make sure
connect well.
2.Change BMU.
W936(XW01General)
External Warning - General
1.Inspect whether the RS485 communicate
cable has been connected correctly and
reliability；
2.Inspect the setting of DIP switch according
to the Address setting guidance;
W937(XW02DcHiVolt)
External Warning - Battery High Voltage
Normal alarm and no need to deal with;
W938(XW03DcLoVolt)
External Warning - Battery Low Voltage
Normal alarm and no need to deal with;
W939(XW04DcHiTmp)
External Warning - Battery High Temp
Normal alarm and no need to deal with;
W940(XW05DcLoTmp)
External Warning - Battery Low Temp
Normal alarm and no need to deal with;
W941(XW06DcHiTmpC)
External Warning - Battery High Temp
Charge
Normal alarm and no need to deal with;
W942(XW07DcLoTmpC)
External Warning - Battery Low Temp
Charge
Normal alarm and no need to deal with;
W943(XW08DcHiCur)
External Warning - Battery High Current
Normal alarm and no need to deal with;

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W944(XW09DcHiChgCur)
External Warning - Battery High Current
Charge
Normal alarm and do not need to deal with;
W953
External Warning –Ext BMS Timeout
1.Check the CAN communication, to make
sure connect well.
2.Change BMU.
9.2 Normal alarm and solution display on B-Plus 2.5
B-Plus display info
Reason
Solution
LED
Yellow led(Alarm) blinks for
0.5Hz，other led are on off
continuously;
Battery is power off abnormally;
1.Press "on/off" button for 2-3 sec
until battery can work normal;
2.If yellow blinks continuously, the
battery needs to be changed;
Yellow led (Alarm), Yellow
led on and buzzing with 4
times.
The battery needs to be
protected or external connection is
incorrect;
1.Power off the battery;
2.Inspect short/reverse connection of
cable between P+&P-;
3.If short/reverse connection is
confirmed, please reconnect cable
correctly;
4.restart battery;
The merry-go-round
No communication with BMU
1. Check the cables between
BMU and batteries;
2. Confirm the connection
is reliable or not
Buzzer
Buzzing for 4 times
Short/reverse connection；
1.Power off;
2.Inspect short/reverse connection of
cable between P+&P-;
3.If short/reverse connection is
confirmed, please reconnect cable
correctly;
4.restart battery;
9.3 Normal alarm and solution display on BMU
Status(display interval
2S)
Definition
LED
Blinks 1 time
Inverter not connected
Blinks 2 time
Battery not connected
Blinks 3 time
Battery disconnect
Blinks 4 time
Battery failure

Page 20
10 Warranty
BYD provides warranty when the product is installed and used according to the description of user manual /
installation manual / warranty letter.
11 Login in after service web
In order to get after service in time, after installation, please login your B-BOX information in our after service
operator web:
For technical problems or inquiries for usage, please contact our installation company.
The following information is required for timely customer service.
Product type
Serial Number
Connected PV module type and number
Option equipment
Any problems please contact us by below address:
Contact us:
China
BYD LITHIUM BATTERY Co.,LTD
Customer Service Mailbox: eubatte[email protected]
Telephone: [phone]
Address: No.1,BaopingRoad,Baolonglndustrial Town Longgang Shenzhen, 518116, P.R.China
Germany
EFT Energy for tomorrow
Customer Service Mailbox: k[email protected]
Telephone: [phone]
Address: Buchenstraße, 37 Lohr a. Main 97816 Germany
Australia
Alps Power Pty Ltd
Customer Service Mailbox: [email protected]
Telephone: [phone]
Address: U201 15Chatham Road West Ryde NSW 2114 Australia