BYD B-Box Pro 12.8 User manual

B-Box Professional user manual
B-Box Pro 12.8
User Manual
Rev 2.1_May.2017
Copyright © BYD Company Limited. All rights reserved.

B-Box Professional user manual
Without the written consent of BYD Company, no entity or individual shall extract,
copy contents of the document. It is not allowed to be translated under any
conditions.
Statement:
The product version update or any other changes to this manual is only allowed with
BYD’s prior agreement. Unless otherwise agreed, the document should be used for
guidance only, all statement information and suggestions in this document do not
constitute any expression of contract or liability.
Please contact BYD directly, if you have any further questions.
BYDLithiumBatteryCompanyLimited
TEL: [phone]
FAX: [phone]

Page 3
Contents
1 General Information ................................................................................................................4
1.1 About this manual ...............................................................................................................4
1.2 Target group ........................................................................................................................4
1.3 Intended usage ...................................................................................................................4
1.4 B-BOX and B-Plus definition .............................................................................................4
1.5 Identifying the product ........................................................................................................4
2 Safety ..........................................................................................................................................5
2.1 Safety precaution ................................................................Error! Bookmark not defined.
2.2 Safety guidelines for installation .......................................................................................6
3 Technical parameters .............................................................................................................7
4 Technical terms explanation ................................................................................................8
5 Product overview .....................................................................................................................9
5.1 B-BOX System brief introduction ......................................................................................9
5.2 B-BOX configuration table ...............................................................................................11
5.3 B-BOX System diagram ...................................................................................................12
5.4 General introduction of BMU ...........................................................................................12
5.5 General introduction of BMS48250 ................................................................................13
5.6 Operating environment ....................................................................................................14
5.7 BMS address switch introduction ...................................................................................14
6 Cleaning and maintenance .................................................................................................15
6.1 Cleaning ...............................................................................Error! Bookmark not defined.
6.2 Maintenance ......................................................................................................................15
7 Dispose special situation ....................................................................................................16
7.1 Battery over discharged maintenance ...........................................................................16
7.2 Force Majeure .....................................................................Error! Bookmark not defined.
8 BOX CONFIGURATION LIST with different inverter .....................................................16
8.1 B-BOX configuration list with SMA sunny island-On/Off grid .....................................16
8.2 B-BOX configuration list with GOODWE ES-On/Off grid ...........................................17
8.3 B-BOX configuration list with GOODWE BP-On grid ..................................................17
8.4 B-BOX configuration list with Solax - On grid ...............................................................18
9 Normal issues and solutions ..............................................................................................18
9.1 Normal alarm and solution display on SMA Sunny Island SRC Error! Bookmark not
defined.
9.2 Normal alarm and solution display on BMS ....................Error! Bookmark not defined.
9.3 Normal alarm and solution display on BMU ...................Error! Bookmark not defined.
10 Warranty ................................................................................................................................20
BYD provides warranty when the product is installed and used according to the
description of user manual / installation manual / warranty letter. ... Error! Bookmark not
defined.
11 Login in After service web ......................................................Error! Bookmark not defined.

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1 General Information
1.1 About this manual
This user manual introduces the B-Box product information, user guidance, safety
caution items and normal failure and actions. Users can contact the after sales service
center if any abnormal failure or urgent issues occur.
1.2 Target Group
This user manual applies to the B-BOX 12.8.
1.3 Intended usage
The B-BOX can be used in household energy storage applications, including on/off-grid system.
The B-BOX works with different inverter brands and the user should refer to the configuration list
of approved inverter manufacturers recommended by BYD.
1.4 B-BOX and B-Plus definition
BYD battery box product B-Box12.8 is defined as follows:
B-Box: Battery Box
B-Plus12.8: Battery unit with nominal capacity of 12.8KWh can be installed inside the
cabinet as an energy storage module.
B-Box 12.8: Battery nominal capacity is 12.8 KWh (Includes 1 set of B-Plus 12.8)
1.5 Identifying the product
The type label describes the product identification information, which is attached to the
product. For safe usage, the user must become familiar with the information on the type
label. The type label displays:
Product Name ：
Product Type ：
Rated Output Voltage:
Rated Current:
Operation Temperature Range:
Serial Number (P/N No.):
Caution:

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Certification Marks:
2 Safety
2.1 Safety precaution
Warning, notice and caution:
Users are kindly requested to use the battery which is supplied by BYD Lithium Battery Company Limited in
strict accordance with the datasheet and remarks included at the end of this document.
BYD Lithium Battery Co., Ltd. will not guarantee or accept liability for a product installed
and operated not in accordance to the guidance manual and resulting in an accident.
WARNING
Do not crush the battery and always 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 7 days.
Do not expose to temperatures above 55℃and keep out of direct sunlight.
Ensure secure 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 top of another when unpackaged.
In the process of transportation and storage, the goods are not allowed to be stacked in layers or at a height
greater than specified.
When increasing the battery capacity, users should first power off the battery and other power inputs.
B-BOX products can only be used in home energy storage applications, and their use is not allowed for
life-sustaining medical devices and automotive applications.
CAUTION

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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 to be used for urgent situations.
A potentially hazardous circumstance such as excessive heat or electrolyte mist may occur due to incorrect
operation, damage or abuse. If the safety precautions and the warning messages described are not fully
understood, or if you have any questions, please contact after sales service for guidance. The safety section
may not include all regulations for your region.
Personnel working with B-Box products must review applicable federal, state and local regulations as well as
the industry standards regarding this product.
When transporting the system packaged as a bundle, remove the battery from the 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 connection 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
region; personnel working with B-Boxes 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 accidental damage.
CAUTION:
Due to the heavy weight of BYD B-Box 12.8, please use strong packaging and safety protection
equipment during transportation, to ensure safety and avoid accidental damage.

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3 Technical parameters
When B-BOX works in different temperatures, the charge and discharge current will be
adjusted automatically. For detailed parameter settings, please refer to the table below:
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 changing from one temperature range to another.
2.N=B-Plus12.8 battery group quantity
Discharge current control with temperature
B-Box Pro 12.8
Battery type
Lithium Iron phosphate battery
Battery module
B-Plus12.8
Nominal battery energy
12.8
Output power (KW)
Max 12.0
Usable battery energy (KWh)(0.2C
charge & discharge at @+25℃)
(KWh)
12.2
Nominal voltage (V)
51.2
Ambient temperature Range (℃)
-10~+50
Communication
RS485/CAN
Cabinet net dimensions(W*D*H
mm)(Without ground feet)
650* 550* 800
Net Weight (Kg)
175
IP level
IP20

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Protect temp./Resume temp.(℃)
Normal current(A)
-20~50/(-15-50)
0.7C*N
Remark:
1.N= B-Plus12.8 battery group quantity
4 Technical terms explanation
No.
Terms
Comment
1
Discharge
Battery output power for load
2
Charge
Battery power supply (such as DC charger)
3
Fully charged
Battery has been fully charged, SOC is 100%.
4
Idle
Battery is on status of neither charge nor discharge and has not been
fully 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 is broken and unit needs replacement
13
Alarm
Battery will stop charging or discharging immediately
14
Protect
Battery stops charging or discharging (e.g. cell is over voltaged).
Operation can resume at a later stage.

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5 Product overview
5.1 B-BOX System brief introduction
B-Box is the short name for battery box, the energy storage part in the electric power system of
a household, and the B-box carries BYD’s lithium batteries offering excellent performance.
There are 2 pcs batteries modules in each box, and the box supports parallel connection to
expand capacity from 12.8KWh to 409KWh, which can meet various capacity requirement for
customers.

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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 house the B-Plus 12.8 and provide DC
output (Each cabinet can install max 1 set of B-Plus12.8)
2
Battery
B-Plus12.8
Battery module with 51.2V 250Ah, BYD’s P/N is: 4S-T.
3
BMS
BMS48250
Battery management system. Manages battery and sends battery
information to BMU.
4
BMU
BMU
Battery management unit. Provides communication with external
equipment.
Configuration list

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5.3 B-BOX System diagram
System diagram
5.4 General introduction of BMU
BMU is the battery management unit installed in the cabinet; its function is to manage the battery’s charge
and discharge, collect information from the battery and report to the inverter.

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Main functions:
✓CAN /RS485 communication with inverter
✓RS485 communication with battery/BMS
✓Dry contact terminal
✓Other communication interfaces for maintenance
✓Charge and discharge management
5.5 General introduction of BMS48250
B-Plus is the commercial name of BYD’s U3A1-50P-A backup battery with 51.2V & 50Ah
which is designed for energy storage applications. The B-Plus 12.8 is an integrated
battery which consists of shell, BMS and
cells.
BMS overview
Display and communication interface
No.
Interface
Mark
Function
③
①
②
④
⑤
⑥
⑦
⑩
⑨
⑧

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①
B+
B+
Connects battery’s positive cable to power the BMS
②
B-
B-
Positive terminal of BMS
③
P-
P-
Negative terminal of BMS
④
SOC LED
SOC
Indicates state of charge of battery
⑤
RUN LED
RUN
Indicates the Plus system is running
⑥
ERR LED
ERR ADDR
Indicates error status
⑦
Alarm LED
Alarm
Indicates alarm status
⑧
RJ45 terminal
RS232/RS485
Communication ports
⑨
Address
ADDR
When parallel connection, address needs setting
⑩
Reset
RESET
Battery activity when no external power/add on battery.
5.6 Operating environment
Operating environment parameters
No.
Item
Requirement
Unit
Remark
Min.
Typical
Max.
1
Discharging
temperature
-20
25
55
℃
2
Charging temperature
-10
25
50
℃
3
Relative humidity
5
95
%
non-condensing
4
Absolute humidity
0.26
25
g/m3
5
Elevation
-
2000
-
m
6
IP level
20
5.7 BMS address switch introduction
After finishing the battery installation, installers should setup the battery address through the
“ADDR” switch.
“ADDR” switch introduction:
Function: Communication between battery and BMU. The BMU will communicate with external
equipment when using CAN communication.
DIP switch definition:
There are 6 bit switches, keeping the switch down it means ”0”, turn up the switch to “ON” means
“1”.

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Address: 000000 Address:100000
For example: when two battery are used, “ADDR” setting is:
No.1 battery address: 100000 No.2 battery address: 010000
Please refer to the configuration list in Appendix1.
Notice: Make sure of the highest address possible between BMS connection and the BMU when
communicating with the inverter.
6 Cleaning and maintenance
6.1 Cleaning
Periodic cleaning is recommended for the B-BOX system. 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 a position with a temperature range of -10℃～+50℃and where the
humidity is less than 80%.The load-bearing of the battery’s packaging is less than 300Kg, so stacking more
than 7 modules is not recommended.
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%
CAUTION:
When users need to clean the B-BOX, please switch off the system firstly.

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25~35 ℃
5%~70%
≤6 months
30%≤SOC≤60%
35~45 ℃
5%~70%
≤3 months
30%≤SOC≤60%
Above 45 ℃
/
prohibit
/
When SOC is less than 1%, the module will be damaged after several days if it’s not charged in time.
Storage parameters under different storage conditions-2
Storage
environment
temperature
Storage time
-20~25 ℃
≤ 15 days
25~45 ℃
≤ 7 days
7 Resolve special situations
7.1 Battery over discharged maintenance
7.1 Battery over discharged maintenance
In the case of power cuts, continuous rainy days etc, the battery may over-discharge. It will still provide
limited energy, but users should pay attention to the backup time of the battery.
7.2 Force Majeure
Catastrophic accidents, including lightning, floods, earthquakes, fires and other natural disasters can bring
unpredictable damage to the whole system.
8 BOX CONFIGURATION LIST with different inverters
8.1 B-BOX configuration list with SMA Sunny Island-On/Off grid
1 Phase on Grid
Inverter Type
B-Box 12.8
Cabinets
SI 3.0M
≥1
≥1
SI 4.4M
≥1
≥1
SI 6.0H
≥1
≥1
SI 8.0H
≥1
≥1
Remark: Maximum B-Box12.8 quantity is 32.

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3 Phase on Grid
Inverter Type
B-Box 12.8
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-Box 12.8
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-Box 12.8
Cabinets
SI 3.0M
≥8
≥2
SI 4.4M
≥8
≥2
SI 6.0H
≥12
≥3
SI 8.0H
≥12
≥3
Remark: Maximum B-Box12.8 quantity is 32.
8.2 B-BOX configuration list with GOODWE ES-On/Off grid
1 Phase on Grid
Inverter Type
B-Box 12.8
4.6kW
≥11
1 Phase off Grid
Inverter Type
B-Box 12.8
4.6kW
≥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-Box 12.8
1
This configuration is only for self consumption applications.

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2.5kW
≥1
Remark: Maximum B-Plus quantity is 32, Cabinet quantity is 8.
8.4 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
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 fail to communicate at
the same time
2.BMU and battery fail to communicate
via RS485
1.Inspect whether the RS485 communication
cable has been connected correctly and
securely
2.Inspect DIP switch settings 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+ and 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
it is connected properly
2.Change BMU

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W936(XW01General)
External Warning - General
1.Inspect whether the RS485 communication
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 further action required
W938(XW03DcLoVolt)
External Warning - Battery Low Voltage
Normal alarm and no further action required
W939(XW04DcHiTmp)
External Warning - Battery High Temp
Normal alarm and no further action required
W940(XW05DcLoTmp)
External Warning - Battery Low Temp
Normal alarm and no further action required
W941(XW06DcHiTmpC)
External Warning - Battery High Temp
Charge
Normal alarm and no further action required
W942(XW07DcLoTmpC)
External Warning - Battery Low Temp
Charge
Normal alarm and no further action required;
W943(XW08DcHiCur)
External Warning - Battery High Current
Normal alarm and no further action required
W944(XW09DcHiChgCur)
External Warning - Battery High Current
Charge
Normal alarm and no further action required
W953
External Warning –Ext BMS Timeout
1. Check the CAN communication to make
sure it is connected properly
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 LEDs are
on/off continuously
Battery is switched off abnormally
1. Press "on/off" button for 2-3
secs until battery can work normally
2. If yellow blinks continuously,
the battery needs to be changed

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Yellow LEDs (Alarm) are on
and buzzing 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+ and 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+ and 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
10 Warranty
BYD provides warranties only when the product is installed and used according to the description of user
manual / installation manual / warranty letter.
11 Login in after sales service web
In order to get prompt after sales service after installation, please login your B-BOX information in our after
sales service operator online portal.
For technical problems or enquiries for use, please contact our installation company.
The following information is required for timely customer service.