BYD Battery-Box L 3.5(AU) User manual

BYD Battery-Box LV User Manual
Battery-Box L 3.5/7.0/10.5/14.0(AU)
Version 2.0

BYD Battery-Box LV User Manual
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Contents
1 General Information..........................................................................................................................2
1.1 Validity.....................................................................................................................................................................2
1.2 Application.............................................................................................................................................................2
1.3 Intended Use.........................................................................................................................................................2
1.4 Definition................................................................................................................................................................2
1.5 Identifying the Product .....................................................................................................................................3
2 Safety...................................................................................................................................................4
3 Technical Data....................................................................................................................................5
4 Technical Terms .................................................................................................................................6
5 Product Overview ..............................................................................................................................7
5.1 Brief Introduction ................................................................................................................................................7
5.2 Configuration Table............................................................................................................................................7
5.3 Introduction of BCU............................................................................................................................................8
5.3.1 BCU interface introduction .......................................................................................................................8
5.3.2 Battery status indicated by Led...............................................................................................................8
6 Cleaning and Maintenance ..............................................................................................................9
6.1 Cleaning ..................................................................................................................................................................9
6.2 Recharge Requirement......................................................................................................................................9
6.2.1 Recharge requirement for batteries in normal storage..................................................................9
6.2.2 Recharge requirement for over discharged batteries .....................................................................9
8 Common Issues and Solutions ......................................................................................................10
8.1 Common Issues of BYD Battery-Box LV and Solutions....................................................................... 10
8.2 Emergency........................................................................................................................................................... 10
9 Warranty ...........................................................................................................................................10
Contact Information ....................................................................................................................................................

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1 General Information
1.1 Validity
This user manual is applicable to the Battery-Box L 3.5(AU), Battery-Box L 7.0(AU), Battery-Box L
10.5(AU) and Battery-Box L 14.0(AU).
1.2 Application
This user manual contains BYD Battery-Box LV product information, usage guidance, safety
information, and details on common operating issues and subsequent corrective actions.
BYD Battery-Box LV is an energy storage unit that is designed to be used in residential on-grid
applications with the capability for short-term backup.
1.3 Intended Use
Notes regarding intended use:
 BYD Battery-Box LV is not suitable for supporting life-sustaining medical devices. A power
outage must not lead to the inability to use life-sustaining medical devices and subsequent
personal injury.
 This product is intended for use only in accordance with the information provided in the
enclosed documentation and with the locally applicable standards and regulations. Any
other application may cause personal injury or property damage.
 The illustrations in this manual are meant only to help explain system configuration
concepts, includes usage guidance, safety precautions, and common operating issues and
subsequent corrective actions.
 Alterations to the product, e.g. changes or modifications, are only permitted with the
express written permission of BYD. Unauthorized alterations will void warranty claims. BYD
shall not be held liable for any damage caused by such changes. Any use of the product
other than that described in the Intended Use section does not qualify as appropriate. The
enclosed documentation is an integral part of this product. Keep the documentation in a
convenient place for future reference and observe all instructions contained therein. The
type label (see Section 1.5) must remain attached to the product.
 BYD Battery-Box LV series products must work with compatible inverters, which are listed
in the BYD Battery-Box LV Compatible Inverter List.
 Please contact BYD or local after-service providers within 1 week once the user decides to
cease using their BYD Battery-Box products.
 The Battery-Box LV system can be installed at altitudes of up to 2000m above Mean Sea
Level.
1.4 Definition
Battery-Box L 3.5~14.0(AU) components are defined as below:

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 BYD Battery-Box LV: Low-voltage household energy storage battery system.
 B-Plus L 3.5(A): Battery module. The Battery module provides the energy and sends the
information about the cell voltage and cell temperature in the battery module to the upper-
layer BCU. The nominal capacity of the B-Plus L 3.5(A) battery is 3.5kWh.
 BCU: Battery Control unit and Base. Two parts consisting of both the battery management
and control component mounted on top of the battery modulus as well as structural base,
which physically supports the battery modules underneath. The top portion of the BCU is
responsible for communication to and connection with the inverter or BMU.
1.5 Identifying the Product
The type label contains the product identification information, and 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:
1.5.1 Warning Label
1.5.2 Product Label

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2 Safety
This section contains safety information that must be observed at all times when working on or
with batteries. To prevent personal injury or property damage and to ensure long-term operation
of the batteries, read this section carefully and observe all safety information at all times.
WARNING
Environmental requirement
 Do not expose the battery to temperature above 50℃.
 Do not install or use the battery near any heat sources.
 Do not install or use the battery in wet locations, such as bathroom.
 Do not expose them to moisture or liquids.
 Do not expose the battery to corrosive gases or liquids.
 Do not expose the battery to direct sunlight for extended periods of time.
 Place battery in secure location away from children and animals.
 Do not allow the battery power terminals to touch conductive objects such as wires.
 Do not expose the battery in dusty and salty environment.
 Do not dispose of batteries in a fire, which may explode.
Operating requirement
 Do not touch the battery pack with wet hands.
 Do not crush, drop or puncture the battery.
 Always dispose of the batteries according to local safety regulations.
 Store and recharge battery in a manner in accordance with this user manual.
 Ensure reliable grounding.
 The charging circuit of inverter shall be DVC A, and the output circuit needs to be isolated
from high voltage bus.
 The cabinet and battery modules shall be transported separately to reduce the risk of
damage caused by drop, vibration, topple, etc.
 Do not short circuit the terminals, remove all metal objects including watches and rings that
could product a short circuit before installation, replacement and maintenance.
 The battery shall be repaired, replaced or maintained by skilled personal recognized. (Skilled
personnel recognized is a trained and qualified electrician or installer defined in installation
guidance).
 Do not reverse the polarity.
 Do not stack up batteries without protective package, when store or handle batteries.
 Do not open, mutilate or disassemble the battery, the released electrolyte, which may be
toxic, is harmful to the skin and eyes.

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 Disconnect the charging source prior to connecting or disconnecting battery terminals, for
instance, disconnect battery from power/load and then power off battery before installation
and maintenance.
 Packaged batteries should not be stacked more than specified number stipulated on the
package.
 Do not lay tools or metal parts on top of batteries.
 Do not use damaged, failed or deformed batteries, which may reach temperatures that
exceed the burn thresholds for touchable surfaces. Continued operation of damaged
battery may result in dangerous situation and cause severe injury due to electrical shock.
3 Technical Data
Model
Battery-Box L
3.5(AU)
Battery-Box L
7.0(AU)
Battery-Box L
10.5(AU)
Battery-Box L
14.0(AU)
Battery Module
B-Plus L 3.5(A) (3.5kWh)
1 module
2 modules
3 modules
4 modules
Usable Energy1[kWh]
3.5
7.0
10.5
14.0
10.0
Max Output Power [kW]
3
6
9
10
Peak Output Power [kW]
5.0, 10s
10.0, 10s
15.0, 10s
15.0, 10s
Round-Trip Efficiency
≥95% (Under test condition [1] )
Nominal Voltage [Vd.c]
51.2
Operating Voltage Range [Vd.c]
40~ 59.2
Communication
CAN / RS485
Dimension
[ W × H × D ,mm ]
620 × 475×
355
620 × 711 ×
355
620 × 947 ×
355
620 × 1183 ×
355
Net Weight [kg]
63
105
147
190
Enclosure Protection Rating
IP55
Warranty2
10 years
Ambient Temperature Range3[℃]
-10~ +50
Certification
TUV(IEC62619) / RCM / UN38.3 /
Scalability
Max. 3 systems in parallel/42kWh
Compatible Inverters4
Please refer to the Battery-Box LV Compatible Inverter List
Application
On grid （Self consumption / On grid +Backup / Backup )
[1] Test conditions: 100% DOD, 0.2C charge & discharge at + 25 °C. System Usable Energy may be variant with different inverter brands
[2] Conditions apply. Refer to BYD Battery-Box Warranty Letter.
[3] -10 °C to +12 °C will be derating
[4] Detailed information refer to BYD Battery-Box Compatible Inverter List
Note: The maximum operating voltage of the rechargeable lithium-ion battery system is less than 60Vd.c

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When BYD Battery-Box LV operates in low temperatures, the charge and discharge current is
adjusted automatically. The battery will limit the current when the operating temperature gets
low. Please refer to the table below for current parameters related to operating temperature:
Discharging current at different temperatures
Temp. (℃)
Max Current (Ad.c)
Battery Box L
3.5(AU)
Battery Box L
7.0(AU)
Battery Box L
10.5(AU)
Battery Box L
14.0(AU)
-10~15
50
100
150
200
15~35
60
120
180
200
35~50
50
100
150
200
Remark: The discharging current adjustment takes about 2 minutes.
Discharging current in backup mode
Temp. (℃)
Max Current (Ad.c)
Battery Box L
3.5(AU)
Battery Box L
7.0(AU)
Battery Box L
10.5(AU)
Battery Box L
14.0(AU)
-10~50
40
80
120
160
Remark: The discharging current adjustment takes about 2 minutes.
Charging current at different temperatures
Temp. (℃)
Max Current (Ad.c)
Battery Box L
3.5(AU)
Battery Box L
7.0(AU)
Battery Box L
10.5(AU)
Battery Box L
14.0(AU)
-10~2
15
30
45
60
2~12
20
40
60
80
12~50
40
80
120
160
Remark: The charging current adjustment takes about 2 minutes.
4 Technical Terms
No.
Terms
Comment
1
Discharge
Battery output power for load
2
Charge
To put electricity into battery by the charger
3
Full charged
Battery had been full charged, SOC is 100%.
4
Idle
Ready for charging or discharging
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-

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Cell voltage
Single cell voltage
12
Failure
Battery or BMS is broken, need to be replaced
13
Alarm
Indicate that the battery is in an abnormal status
14
Over discharged
Energy state of the battery is too low and needs to be recharged
5 Product Overview
5.1 Brief Introduction
This product is a low-voltage DC battery system with an operating voltage of 48V. It is utilized in
household energy storage applications and works together with a low-voltage inverter to realize
the goal of energy storage for the home. A battery system consists of 1 to 4 individual battery
modules connected in parallel.
Product overview
Main Components:
5.2 Configuration Table
No.
Type
BCU
B-Plus L 3.5(A)
Base
Energy(kWh)
Voltage(Vd.c)
1
Battery-Box L 3.5(AU)
1
1
1
3.5
51.2
2
Battery-Box L 7.0(AU)
1
2
1
7.0
51.2
3
Battery-Box L 10.5(AU)
1
3
1
10.5
51.2
4
Battery-Box L 14.0(AU)
1
4
1
14.0
51.2
B-Plus L 3.5(A)
BCU
Base

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5.3 Introduction of BCU
BCU, the management unit, is one of the main component of the energy storage system, it
communicates upward with inverters and downward with batteries by collecting batteries
information and send them to inverters to make sure the system works normally.
5.3.1 BCU interface introduction
Parameters of Wifi module
Catalog
Parameter
Value
Wireless parameters
Working frequency
2.412GHz-2.4835GHz
Transmit power
802.11b: +16 +/-2dBm (@11Mbps)
802.11g: +14 +/-2dBm (@54Mbps)
802.11n: +13 +/-2dBm (@HT20, MCS7)
Distance of
communication
Wireless communication distance
Open air, no shelter from 100m
Software
parameters
Configuration
AT+Instruction set
WiFi point to point
Web server
Safety
WEP/WPA-PSK/WPA2-PSK
Wireless network type
STA/AP
Encryption type
WEP64/WEP128/TKIP/AES
Network protocol
IPv4,TCP/UDP/FTP/HTTP
5.3.2 Battery status indicated by Led
The battery status can be indicated by the Led, please refer to the following table for details.
Position Designation
Terminals on the right
A
Power button/LED indicator
B
Handle
C
Rubber plug
D
Gland for P+ P- & Grounding cables
E
Bolt
F
Gland for CAN cables of Inverter and BCU

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6 Cleaning and Maintenance
6.1 Cleaning
BYD Battery-Box LV system is recommended to be cleaned periodically with soft, dry brush or dust
collector to remove the dust on the enclosure. Liquids such as solvents, abrasives or corrosive
liquids should not be used to clean the enclosure.
6.2 Recharge Requirement
6.2.1 Recharge requirement for batteries in normal storage
Batteries should be stored in an environment with a temperature range between -10℃～+45℃,
and maintained regularly according to the following table with 0.5C (35A) current until 40% SOC
after a long time of storage.
Recharge conditions for batteries in normal storage
6.2.2 Recharge requirement for over discharged batteries
Please recharge the over discharged batteries in a timeframe that is in accordance to the following
table, otherwise the over discharged battery modulus will be damaged.
Storage environment
temperature
Relative humidity of
storage environment
Storage time
SOC
Below -10℃
/
prohibit
/
-10~25℃
5%~70%
≤12 months
30%≤SOC≤60%
25~35℃
5%~70%
≤6 months
30%≤SOC≤60%
35~45℃
5%~70%
≤3 months
30%≤SOC≤60%
Above 45℃
/
prohibit
/