SEPLOS 16S 200A BMS CAN RS485 8-16S LiFePO4 Batterie Management System User Manual

: June 13, 2024
: SEPLOS

16S 200A BMS CAN RS485 8-16S LiFePO4 Batterie Management System

SEPLOS 16S 200A SMART BMS USER MANUAL

Product Information:

The SEPLOS 16S 200A SMART BMS is a battery management system
manufactured by Dongguan Seplos Technology Co., Ltd. It is designed
to monitor and protect battery packs, ensuring safe and efficient
operation.

Features:

Cell and pack voltage detection
Cell/ambient/MOSFET temperature detection
Charging/discharging current detection
Short circuit protection
Pack capacity and cycle life calculation
Charging/discharging MOSFET
LED indicator for status and fault indicating
Standby mode with auto sleeping function
Power on/off with master pack for paralleled battery packs
CAN/RM485/RS485 interface for communication
Battery information storage

Product Usage Instructions:

1. Application:

The SEPLOS 16S 200A SMART BMS is suitable for various
applications where battery packs need to be managed and
protected.

2. Features:

Below are the features of the SEPLOS 16S 200A SMART BMS:

Cell and pack voltage detection
Cell/ambient/MOSFET temperature detection
Charging/discharging current detection
Short circuit protection
Pack capacity and cycle life calculation
Charging/discharging MOSFET
LED indicator for SOC status, warning, protection, and fault
indicating
Standby mode with auto sleeping function
Power on/off with master pack for paralleled battery packs
CAN/RM485/RS485 interface for communication
Battery information storage

3. Usage Instructions:

2.1 Cell and pack voltage detection:

The BMS can detect the voltage of individual cells and the
overall pack voltage.

2.2 Cell/ambient/MOSFET temperature detection:

The BMS can detect the temperature of cells, ambient
temperature, and MOSFET temperature.

2.3 Charging/discharging current detection:

The BMS can detect the current during charging and
discharging.

2.4 Short circuit protection:

The BMS features short-circuit detecting and protecting function
to safeguard against short circuits.

2.5 Pack capacity and cycle life calculation:

The BMS can calculate the pack capacity and cycle life,
providing valuable information for battery management.

2.6 Charging/discharging MOSFET:

The BMS is equipped with low impedance, high current MOSFET for
optimized power-on, zero handoff, and charging voltage withstanding
for large capacitive loads backup power supply. Each cell can be
equalized during charging or standby status, increasing battery
lifespan and cycle life. The voltage and voltage difference
threshold values can be configured through software.

2.7 LED indicator:

The BMS has 6 LED indicators. 4 white LED indicators represent
SOC (State of Charge) status, 1 red LED indicator is for warning,
protection, and fault indicating, and 1 white LED indicates battery
standby, charging, and discharging status.

2.8 Standby mode:

The BMS features an auto sleeping function. It will
automatically enter standby mode if the battery doesn’t
charge/discharge for 48 hours. If the battery is in discharge
protection status and maintains communication for 1 minute, the BMS
will sleep automatically. It can also be manually put into standby
mode by holding the ‘reset’ button for 6 seconds. The indicators
will lighten in order, indicating the BMS is in sleeping mode.
Disconnecting the external switch will also put the battery pack
into standby mode. The sleeping mode function is configurable
through software.

2.9 Power on/off with master pack:

When multiple battery packs are connected in parallel, the BMS
can be powered on/off together with a single click on the master
pack. The BMS needs to set up an address via a DIP switch when
connected in parallel. If the DIP address is correctly set,
powering on/off the master pack will also power on/off all the
slave packs. Please note that if each pack has a different voltage
and there’s current output between the paralleled packs, the slave
packs cannot be powered off.

2.10 CAN/RM485/RS485 interface:

The BMS has a CAN/RM485/RS485 interface for communication with
other devices or systems.

2.11 Parallel communication:

The battery packs can be connected through RS485 and the address
can be set using 8 DIP switches. There are two ways to check the
paralleled packs’ information: connecting the paralleled packs with
the RS485 interface and then connecting with a master computer, or
connecting the paralleled packs with the RS485 interface and then
connecting the master pack with an inverter via the CAN/RM485
interface.

2.12 Battery information storage:

The BMS saves data information each time the battery system
changes status, including warnings, protection triggering, and
other relevant data.

Dongguan Seplos Technology Co., Ltd

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CONTENT
1. Application ……………………………………………………………………………….4 2. Features …………………………………………………………………………………..4
2.1 Cell and pack voltage detection …………………………………………. 4 2.2 Cell/ambient/MOSFET temperature detection …………………….. 4 2.3 Charging/discharging current detection ……………………………….5 2.4 Short circuit protection …………………………………………………….. 5 2.5 Pack capacity and cycle life calculation ……………………………….. 5 2.6 Charging/discharging MOSFET …………………………………………… 5 2.7 Cell balancer …………………………………………………………………….6 2.8 LED indicator …………………………………………………………………… 6 2.9 Standby mode …………………………………………………………………. 6 2.10 Power on/off with master pack …………………………………………6 2.11 CAN/RM485/RS485 interface ……………………………………………7 2.12 Parallel communication ……………………………………………………7 2.13 Battery information storage ……………………………………………..7 2.14 Battery parameter configuration ……………………………………….8 2.15 Battery function configuration …………………………………………. 8 2.16 Precharge ……………………………………………………………………… 8 2.17 Dry contact …………………………………………………………………….8 2.18 Aerosol supportable ………………………………………………………..9 2.19 Bluetooth ……………………………………………………………………… 9 2.20 Compensation ……………………………………………………………….. 9 2.21 Charging current limiting ………………………………………………..10 2.22 Automatically identification …………………………………………… 11 2.23 BatteryMonitor software ………………………………………………. 11 2.24 Firmware updating ………………………………………………………..11 3. Diagram ………………………………………………………………………………… 12 4. Electrical features …………………………………………………………………… 12 5. Basic parameters ……………………………………………………………………. 12 5.1 Parameter setting ………………………………………………………….. 12
5.1.1 Individual cell over voltage parameters …………………….12 5.1.2 Individual cell low voltage parameters …………………….. 13 5.1.3 Pack over voltage parameters ………………………………… 13 5.1.4 Pack low voltage parameters …………………………………..14 5.1.5 Cell high/low temperature (charging) parameters …….. 14 5.1.6 Cell high/low temperature (discharging) parameters …. 15 5.1.7 Ambient high/low temperature parameters …………….. 15 5.1.8 MOSFET high/low temperature parameters ………………16 5.1.9 Charging current limiting parameters ……………………….16 5.1.10 Charging over current parameters ………………………….17 5.1.11 Discharging over current parameters …………………….. 17 5.1.12 Transient over current parameters …………………………18 5.1.13 Short circuit parameters ……………………………………….18
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5.1.14 Cell balance parameters ………………………………………. 19 5.1.15 Cell balance parameters ………………………………………. 19 5.1.15 Other parameters ………………………………………………..20 5.2 Working mode ………………………………………………………………. 21 5.2.1 Charging mode …………………………………………………….. 21 5.2.2 Discharging mode ………………………………………………….21 5.2.3 Standby mode ……………………………………………………… 21 5.2.4Power off mode ……………………………………………………..21 5.3 LED indicator …………………………………………………………………. 22 5.3.1LED lights ………………………………………………………………22 5.3.2 Capacity indicators ……………………………………………….. 22 5.3.3 Lights blinking explanation A ………………………………….. 22 5.3.4 Running status indicators ………………………………………. 23 6. Function intoduction ………………………………………………………………..23 6.1 Standby ………………………………………………………………………… 23 6.2 over charging protection and recovery ……………………………… 24 6.2.1 Cell over charging protection and recovery ………………. 24 6.2.2 Pack over charging protection and recovery …………….. 24 6.3 over discharging protection and recovery ………………………….. 24 6.3.1 Cell over discharging protection and recovery ……………24 6.3.2 Pack over discharging protection and recovery …………. 25 6.4 Charging over current protection and recovery ………………….. 25 6.5 Discharging over current protection and recovery ………………. 25 6.6 Temperature protection and recovery ………………………………. 26 6.6.1 High temperature protection and recovery ……………….26 6.6.2 Low temperature protection and recovery ………………..26 6.6.3 Ambient and MOSFET temperature protection …………. 26 6.7 Cell balance ……………………………………………………………………27 6.8 Power on/off ………………………………………………………………….27 6.9 Storage ………………………………………………………………………….27 7. Size and dimension …………………………………………………………………. 28 8. Appearance …………………………………………………………………………….28 8.1 Wire introduction ……………………………………………………………29 8.2 Wiring ………………………………………………………………………….. 30 9. Communication introduction ……………………………………………………. 30 9.1 CAN and RM485 …………………………………………………………….. 30 9.2 RS485 …………………………………………………………………………… 31 9.3 Parallel …………………………………………………………………………. 32 9.4 DIP switch …………………………………………………………………….. 32 9.5 Auto-identification …………………………………………………………. 32 10. LCD screen …………………………………………………………………………… 33 11. Safety precautions ………………………………………………………………… 34

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1. Application
This is the full-featured Battery Management System (BMS) that designed to monitor 16s LFP battery pack at 200A rate. The BMS offers protection and recovery to individual cell over/under voltage, pack over/under voltage, charge/discharge over current, high/low temperature and short circuit. And accurately calculates the SOC and SOH status. As well as keeps voltage balancing during charging and discharging. And could also monitors parameter settings and data through computer via RS485 interface. (Baud rate 19200. )
2. Features
2.1 Cell and pack voltage detection
By detecting the cell voltage in real-time, BMS provides over/under voltage warnings and protections. At the temperature of 045, the measured voltage difference is about ±10mV. While at the temperature of -200 and 4570, the measured voltage difference is ±30mV. The warning and protection threshold value can be configurable through software.
2.2 Cell/ambient/MOSFET temperature detection
By detecting the temperature of cells (4 of the 16 cells), ambient temperature, and temperature of PCB board in real-time via NTC, BMS provides high/low temperature warnings and protections. The measured difference is ±2. Cell temperature sensor NTC value is 10K, and B-value at 3435. The warning and protection threshold value can be configurable through software.
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2.3 Charging/discharging current detection
With the current sense resistors in the charging/discharging circuit, BMS detects and monitors the the input and output current in real-time, and provides over current warnings and protections. When the temperature rise is less than 40, the measured accuracy is up to ±1%. The warning and protection current threshold can be configurable through software.
2.4 Short circuit protection
BMS features short-circuit detecting and protecting function.
2.5 Pack capacity and cycle life calculation
BMS calculates the remaining capacity in real-time. The BMS get the capacity at the first time when the battery pack complete a full charging and discharging cycle. And the SOC calculating accuracy is ±5%. BMS counts the number of how many charging/discharging cycles a battery has experienced as aging. When the accumulated discharge capacity is equal to 80% of the design capacity. The cycle count increases. The capacity parameters can be configurable through software.
2.6 Charging/discharging MOSFET
Low impedance, high current MOSFET is the optimized design for the power-on, zero handoff and charging voltage withstanding for large capacitive loads backup power supply. When in charging or standby status, each cell can be equalized. Which will greatly increases battery life span and cycle life. The voltage and

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voltage difference threshold value can be configurable through software.
2.7 LED indicator

There are 6 LED indicators. 4 white LED indicators for SOC status. 1 red LED indicator for warning, protection, and fault indicating. And 1 white LED for battery standby, charging and discharging status.
2.8 Standby mode

BMS features auto sleeping function. Automatically standby: If the battery didn’t charge/discharge for 48 hours. The BMS will
enter standby mode automatically. If the battery is in discharge protection status, and maintains
communication for 1 minutes. The BMS will sleeping automatically. Manually standby: Hold the `reset’ button for 6 seconds. The indicators lighten in order.
And the BMS enters into sleeping. To disconnect the external switch, the battery pack will entering
standby mode. Sleeping mode function is configurable through software.
2.9 Power on/off with master pack

Paralleled battery packs could be powered on with one-click. When the battery packs are connected in parallel, BMS needs to setup address via DIP switch. If the DIP address is correctly set, power on/off the master pack, all the slave packs can be powered on/off together. (If each pack with different voltage, and there’s current output between the paralleled packs, slave packs cannot be powered off.)

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2.10 CAN/RM485/RS485 interface
CAN BUS could realize communication between battery and inverter. And CAN communication has different protocol according to different inverters. (Seplos Default CAN protocol is compatible with Pylontech, Goodwe, DEYE, TBB, protocol. To switch protocols through software, there are optional Growatt, Victron, SMA, Sofar, Solis, and Studer protocols.) RS485 communication could realize communication between battery and inverter. And CAN communication has different protocol according to different inverters. (RS485 could recognize the Pylontech, Growatt, and SRNE protocol ) RS485 communication could realize data monitoring, operation controlling and parameter setting through computer or other devices via telemetering, telesignalization, remote regulating and remote control commands.
2.11 Parallel communication
Connect the battery packs through RS485. And setup address with 8 DIP switches. Two ways to check the paralleled packs information: Connected the paralleled packs with RS485 interface. Then
contented with master computer. Connected the paralleled packs with RS485 interface. Then connect
the master pack with inverter via CAN/RM485 interface.
2.12 Battery information storage
Each time the battery system changes status, BMS will save the data information, which including warning, protection triggering and

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releasing data. BMS can also save the data information of a certain period of time by setting start time, end time and time interval. Up to 300 historical data can be recorded and stored. And all the data can be read, and save as excel through master computer.
2.13 Battery parameter configuration

Voltage of individual cell, total voltage, charging and discharging over current, high or low temperature of cell and ambient, cell balancing and equalization, the numbers of cells in series, battery capacity and other battery management parameters can all be configurable through software.
2.14 Battery function configuration

Manage voltage, temperature, and current related monitoring and controlling functions, as well as capacity calculating function through software.
2.15 Precharge

The pre-charge function will be activated at the moment when BMS or discharge MOSFET powered on. The pre-charge time range is 1mS 5000mS. This function will effectively protect BMS from short circuit. And it is specially designed for the application of capacitive load.
2.16 Dry contact

BMS features two circuit of dry contact output for, SOC warning and protection, low voltage warning and protection,
temperature abnormal warning and protection, over charging/discharging warning and protection, over voltage warning and protection.

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Temperature sensor failure warning, cell voltage difference failure, transience over current protection, short circuit protection, and cell over voltage protection + 30mV.
2.17 Aerosol supportable

BMS supports abnormal information transmit via aerosol dry contact and remind customer about the abnormal status.
2.18 Bluetooth

We can monitor and configure the functions, parameters, and warning information through Bluetooth APP. Battery information The communication between BMS and inverter Warning status, parameters, and function switch configuration Paralleling information English version available
2.19 Compensation

Long copper bus bars, or wires would cause large voltage difference. If the voltage difference is too large, check the connectors between the two cells. The voltage difference caused by long bus bars and wires could set voltage compensation through upper computer system. Check the voltage difference between the long bus bars, or wires when discharging, and calculate the resistance compensation according to resistance=voltage difference/current. And set the resistance value with upper computer system. The default resistance compensation is between the anode of 9th battery and cathode of 13th battery. Another two resistance compensation reserved for special occasions. Note: Please confirm with SEPLOS before setting the resistance

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compensation value to ensure the consistency of cells. 2.20 Charging current limiting

There are two kinds of current limitation to meet different needs. That is active current limitation and passive current limitation. Active current limitation: When at the charging status, the current limitation MOSFET keeps being connected. And the charging current will be limited to 10A. Passive current limitation: When at the charging status, the charging MOSFET keeps being connected. Once the charging current reaches over current warning threshold (The default threshold value is 100A.), the charging current limitation will be activate. And the charging current will decrease to 10A. BMS will detect the charging current every 5 minutes, and check whether the charging current could activate passive current limitation. (The default passive current limitation threshold is edible. )

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2.21 Automatically identification
If the automatically identification functions switched on, each paralleled battery pack can distribute identifications according to wiring connections. No need to dial DIP switches. 2.22 BatteryMonitor software
Software name is BatteryMonitor. It is available in Chinese and English version. (Load the corresponding language agreement.) Check the installation guide for installation. Download the software with this link: https://drive.google.com/drive/folders/10pxgNLHovcDZRVGrCZsSkfecBr Rw-AdW?us p=sharing 2.23 Firmware updating
Upgrade the firmware via RS485 interface.
3. Diagram

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4. Electrical features

Item Standard working voltage Standard charging voltage Working temperature range Storage temperature range Working humidity Continuously charging current Continuously discharging current Discharge output impedance Power consumption Sleeping mode power consumption
5. Basic parameters

Min. 40V 30V -20 -40 10%
/ /

Max. 59V 60V 70 85 85% 110 110
<2m <40mA
50uA

Type 48V 54V 25 25 / 100 100
0uA

5.1 Parameter setting

5.1.1 Individual cell over voltage parameters

Individual cell over voltage parameter

Functions
Over voltage warning

Status Item

Over voltage warning

ON

recovery

Under voltage warning

Under voltage warning recovery
Over voltage protection

Over voltage protection recovery

over

voltage

ON

protection

Over voltage recovery condition

Default 3500mV 3400mV
2900mV 3100mV

Configurable Range Over voltage warning recovery over voltage protection
3000mV – over voltage warning
Under voltage protection – under voltage warning recovery
Under voltage warning – 3300mV

3650mV Over voltage warning – 4500mV

3400mV

Over voltage warning recovery – over voltage protection

1. Individual cell voltage decrease to over

voltage recovery threshold.

2. The remaining capacity lower than 96% of

the intermittent power supply.

Both conditions should be satisfied.

Output current 1A

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5.1.2 Individual cell low voltage parameters

Individual cell low voltage parameter

Functions
under voltage protection

Status Item Under voltage protection

Under voltage protection recovery

ON

Under voltage protection

condition

Under voltage protection recovery

Default 2700mV 2900mV

Configurable Range
1500mV – under voltage protection recovery Under voltage protection – under voltage warning

When an individual cell gets under voltage

protection threshold, BMS maintain

communication with inverter for 1 minutes and

powered off.

Input current1A

5.1.3 Pack over voltage parameters

Pack over voltage parameter

Functions
Over voltage warning
Over voltage protection

Status Item

Default

Configurable Range

Over voltage warning
Over voltage warning recovery ON Under voltage warning
Under voltage warning recovery

56.0V 54.0V 46.4V 48.0V

Over voltage warning recovery over voltage protection 53.0V – over voltage warning
Under voltage protection – under voltage warning recovery
Under voltage warning – 55.0V

Over voltage protection

57.6V

Over voltage warning – 60.0V

Over voltage protection recovery

54.0V

Over voltage warning recovery over voltage protection

1. Individual cell voltage decrease to over

ON

voltage recoverythreshold.

Over voltage protection

2. The remaining capacity is lower than 96%

recovery conditions

of the intermittent power supply.

Both conditions should be satisfied.

Output current1A

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5.1.4 Pack low voltage parameters

Pack low voltage parameter

Functions
Under voltage protection

Status Item
Under voltage protection Under voltage protection recovery

ON

Under voltage protection

condition

Under voltage protection recovery conditions

Default 41.6V 46.0V

Configurable Range
36.0V – under voltage warning recovery Under voltage protection – under voltage warning

When the total voltage gets under voltage

protection threshold, BMS maintain

communication with inverter for 1 minutes and

powered off.

Input current1A

5.1.5 Cell high/low temperature (charging) parameters

Functions
Cell temperature (Charging)

Cell high/low temperature (charging) parameters

Status Item
High temperature warning
High temperature warning recovery High temperature protection (charging)
High temperature protection recovery

Default 50
47 55 50

Low temperature

ON

warning

Low temperature warning recovery (charging)
Low temperature protection

2 5 -10

Low temperature

protection recovery

0

Configurable Range High temperature warning recovery – high temperature protection 35 – high temperature warning
High temperature protection recovery – 80 High temperature warning recovery – high temperature protection Low temperature protection –
low temperature warning recovery
Low temperature warning – 10
-20 – low temperature
protection recovery
Low temperature protection –
low temperature warning
recovery

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5.1.6 Cell high/low temperature (discharging) parameters

Cell high/low temperature (discharging) parameters

Functions

Status

Item
High temperature warning

High temperature warning recovery

High temperature protection

High temperature protection recovery

ON Cell temperature (Discharging)

Low temperature warning
Low temperature warning recovery Low temperature protection

Default 52 47 55 50

Configurable Range High temperature warning recovery – high temperature protection
High temperature protection
recovery – 80 High temperature warning recovery – high temperature protection
High temperature warning recovery
– high temperature protection

-10

Low temperature protection – low temperature warning recovery

3 -15

Low temperature warning – 10
-30 – low temperature protection recovery

5.1.7 Ambient high/low temperature parameters

Ambient high/low temperature parameters

Functions
Ambient temperature

Status ON

Item
High temperature warning High temperature warning recovery High temperature protection High temperature protection recovery Low temperature warning
Low temperature warning recovery
Low temperature protection
Low temperature protection recovery

Default 50 47 60 55 0

Configurable Range High temperature warning recovery – high temperature protection
-20 – high temperature warning recovery
High temperature protection recovery -80
High temperature warning recovery – high temperature protection Low temperature protection – low temperature warning recovery

3 -10 0

Low temperature warning – 60 -30 – low temperature protection recovery Low temperature protection – low temperature warning recovery

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5.1.8 MOSFET high/low temperature parameters

MOSFET high/low temperature parameters

Functions Status Item

Default

Configurable Range

High temperature warning

90

High temperature warning recovery high temperature protection

MOSFET ON
temperature

High temperature warning recovery High temperature protection

85

60 – high temperature warning

100

High temperature warning – 120

High temperature protection recovery

85

High temperature warning recovery high temperature protection

5.1.9 Charging current limiting parameters

Functions
Current limiting (charging)

Charging current limiting parameters

Status Item

Default Configurable Range

Active current limiting OFF

When the charger current10A, current limiting activated.

10A

When the charger currentcharging over

Passive current limiting

current warning (configurable), current

limiting activated.

ON

After the current limiting being activated,

Charging current limiting time delay

5 min

BMS re-check the current to judge whether to maintain current

limiting.

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5.1.10 Charging over current parameters

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Charging current limiting parameters

Functions Status Item

Over current

warning

ON

(charging)

Over current warning
Over current warning recovery

Default 200A

Configurable Range Charging over current warning recovery charging over current protection

195A

0A – charging over current warning

Over current protection 210A

0A~150A

Over current

protection

ON

(charging)

Over current protection 10S

Configurable

time delay Over current protection recovery conditions

BMS detects any output discharge current. After 60 seconds, the protection recovers

Effective charging current

Charging current (in) Charging current (out)

automatically. 1000mA 700mA

5.1.11 Discharging over current parameters

Discharging over current parameters

Functions
Over current warning

Status Item

ON

Over current warning

Over current warning recovery

Default -205A
-203A

Configurable Range Over current protection – over current warning recovery
Over current warning -0A

Over current ON
protection

Over current protection -210A

Transient over current protection – 0A

Over current protection time delay Over current protection
recovery conditions

10S

Configurable

1. BMS detects any input charge current.
2. After 60 seconds, the protection recovers automatically.

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5.1.12 Transient over current parameters

Transient over current parameters

Functions Status Item

Default Configurable Range

ON Over current protection (Transient)
OFF

Over current protection
Over current protection time delay

-300A 30mS

Discharge over current protection – 300A Configurable

Over current recovery

protection

BMS detects any input charge current. After 60 seconds, the protection recovers automatically.

Over current lock

1. Continuously over current for 2 times. 2. The over current lock times exceeded.

Over current lock times 5 times

Over current lock release Connected with charger

5.1.13 Short circuit parameters

Short circuit parameters

Functions Status Item

Default Configurable Range

Short circuit protection

1. Programmed into the software (can not be edited)

ON Short circuit protection
ON

current value and time delay 2. Cannot be turned off

Short circuit protection

BMS detects any input charge current.

recovery

After 60 seconds, the protection recovers automatically.

Short circuit protection lock
Short circuit protection lock times Short circuit protection lock release

1. Continuously short in the output circuit. 2. The over current protection lock times exceeded.
5 times Connected with charger

Effective

Discharge current (in)

-1000mA

discharging current

Discharge current (out)

-700mA

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5.1.14 Cell balance parameters

Short circuit parameters

Functions

Status ON ON

Item Standby balance

Default

Configurable Range

When there is no charging and discharging current flow,

the standby equalization will be activated.

Standby time Charging equalization

10 hours

configurable

When at the charging or float charging status, the

charging equalization will be activated.

Cell balance Cell failure

Balance conditions
ON
ON

Activate voltage Activate voltage difference
End voltage
Temperature No equalization high temperature
No equalization low temperature
Voltage difference Voltage difference recovery

3350mV

Configurable

30mV

20mV
According to the temperature range of no equalization (ambient temperature)

50 0 500mV 300mV

Configurable Configurable

5.1.15 Cell balance parameters

Capacity

Capacity parameters

Nominal capacity

200AH

5-300Ah

Remaining capacity

Calculated accordingly to the cell voltage Configurable

Cycle life accumulated 80%
capacity

Remaining capacity

ON

warning

15%

ON

Remaining capacity

5%

protection

Cycle life (configurable)
Output current flow will be cut off.

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5.1.15 Other parameters

Pre-charging

2000ms

BMS power

consumption

ON

0-5000ms

The pre-charging function will be activated once the BMS powered on.

Longest

48 hours (Do not connected with charger,

standby time and no effective charging current.)

Start

heating

0

temperature

Configurable

Heating

Stop heating

ON

temperature

10

When connected with charger, and the cell

Heating

temperature reaches the setting value, the

function activation

heating function activated. Heating function disabled when at standby and discharge status.

External switch

When at the standby status, the BMS can be powered on/off

OFF

through external switches.

LCD screen

ON

Charging

activating

ON

Compensating Compensation 1 impedance Compensation 2

Monitoring software to check the cell voltage, temperature

and current. 1 minutes 0m

The BMS powered off after under voltage protection. Press the button for recovering from protection status and activate output current.
9

Configurable Configurable

0m

13

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5.2 Working mode

5.2.1 Charging mode
When a charger was detected, and the charger voltage is 0.5V+ more than the battery voltage, BMS will turn on the charging MOSFET. And when the charging current reaches the effective charging current value, BMS enters charging mode. At charging mode, charging and discharging MOSFET are both turned on.
5.2.2 Discharging mode
When a loads was detected, and the discharging current reaches the effective charging current value, BMS enters discharging mode.
5.2.3 Standby mode
When the BMS not in charging mode, nor discharging mode, it enters standby mode.
5.2.4Power off mode
When the battery standby for 48 hours, and the battery is in under voltage protection status, or to press the reset/external switches, then the BMS will enter power off mode. BMS activation conditions: 1.Charging to activate 2.Activate with 48V voltage 3.Press the power switches

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5.3 LED indicator

5.3.1LED lights

One running indicator (Green)

One warning indicator (Red)

And four capacity indicator (Green)

SOC

5.3.2 Capacity indicators

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ALARM

RUN

Status Capacity

Charging

Discharging

L4 L3 L2 L1 L4 L3 L2 L1

0-25%

OFF OFF OFF Blink OFF OFF OFF Green

25%-50% OFF OFF Blink Green OFF OFF Green Green

50%-75% OFF Blink Green Green OFF Green Green Green

75%

Blink Green Green Green Green Green Green Green

Running

Green

Blink

5.3.3 Lights blinking explanation A

Blink Type Blink A Blink B Blink C

Lighten TIEM 0.25S 0.5S 0.5S

OFF TIME 3.75S 0.5S 1.5S

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5.3.4 Running status indicators

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SYSTEM

RUNNING

RUN ALM

SOC

REMARK

OFF

SLEEPING

OFF OFF OFF OFF OFF OFF

OFF

STANDBY

RUNNING

Blink A OFF OFF OFF OFF OFF

Standby

RUNNING

Green OFF

According to the remaining capacity

LED Blink B

Over current warning

Green Blink B

According to the remaining capacity

LED Blink B

CHARGE

Over voltage

protection Temp. And over
current protection

Blink A Blink A

OFF Blink A

RUNNING

Blink C OFF

OFF OFF OFF OFF
OFF OFF OFF OFF According to the remaining

warning

Blink C Blink C

Temp. Over

current, short

DISCHARGE

circuit protection

OFF RED OFF

Under voltage

protection

OFF OFF OFF

capacity OFF OFF OFF OFF

OFF OFF No discharge

6. Function intoduction

6.1 Standby
When the BMS is well-connected, and the battery is not in over/under voltage, over current, short circuit or high/low temperature protection status, press the reset button to activate the BMS. Then the LED
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indicator lighten in order. And the BMS is in standby status. At standby status, the running indicator blinks. And the battery pack can be charged and discharged.
6.2 over charging protection and recovery

6.2.1 Cell over charging protection and recovery

When an individual cell voltage exceeds the setting over charging protection threshold, BMS enters over charging protection status. And the battery can not be charged. Conditions to release the over discharge protection status. 1.When the cell voltage decreases to individual cell over charging
recovery threshold, and the SOC is lower than 96%. 2.When connected with loads.
6.2.2 Pack over charging protection and recovery

Conditions to release the over discharge protection status. 1.When the cell voltage decreases to individual cell over charging
recovery threshold, and the SOC is lower than 96%. 2.When connected with loads.
6.3 over discharging protection and recovery

6.3.1 Cell over discharging protection and recovery

Whenever an individual cell voltage lower than the over discharge protection threshold, BMS enters over discharge protection status. And the battery can not be charged. After maintaining communication with inverter for one minutes, the BMS will power off. BMS can be activate by pressing reset button, or charging. And BMS will detects the voltage and check whether the voltage reaches the recovery
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threshold. 6.3.2 Pack over discharging protection and recovery

When the pack total voltage decrease to the over discharging protection threshold, discharging MOSFET will be disconnected and battery pack can not be discharged. The BMS enters over discharge protection status. After maintain communication for one minutes, BMS will shut off automatically. BMS can be activated by pressing `reset’ button or charging. After being activated, BMS detects the pack total voltage, and check whether the total voltage reach the recovery threshold.
6.4 Charging over current protection and recovery

If the charging limitation function is turned off, the charging over current protection will be activated once the charge current being too large. When charging current value exceeds the setting over current threshold, and with enough the time delay, BMS enters charging over current protection. And the battery can not be charged. Two ways to recover from charging over current protection. BMS will recover charging automatically after a certain time (default
time). And detects the charging current value at the same time to check whether the current value reaches recovery threshold. Charging over current protection can be released by discharging.
6.5 Discharging over current protection and recovery

When the discharging current exceeds over current protection threshold, and with enough time delay, BMS enters discharging over current protection. And the battery can not be discharged. BMS will recover discharging automatically after a certain time (default

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time). And detects the discharging current value at the same time to check whether the current value reaches recovery threshold. For discharging over current protection, there’s transient current and discharge current. The recovery condition is the same. But when the transient over current protection times reaches the lock time threshold, only charging or restarting could release the protection.
6.6 Temperature protection and recovery

There are six temperature sensing leads to detects and monitors the temperature in real-time.
6.6.1 High temperature protection and recovery

When at the discharging status, any cell temperature (There are four NTC for cell temperature detecting.) exceeds the high temperature protection threshold, BMS enters high temperature protection status. And the battery can not be charged or discharged. When detecting the cell temperature decreased to high temperature recovery threshold, BMS recovers charging/discharging functions.
6.6.2 Low temperature protection and recovery

When at the charging status, any cell temperature decreased to the low temperature protection threshold, BMS enters low temperature protection status. And the battery can not be charged or discharged. When detecting the cell temperature exceeds the low temperature recovery threshold, BMS recovers charging/discharging functions.
6.6.3 Ambient temperature and MOSFET temperature

When detecting the ambient temperature exceeds ambient temperature warning threshold, BMS enters high temperature warning status.

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When detecting the MOSFET temperature exceeds the MOSFET temperature protection threshold, BMS enters Mosfet high temperature protection status.
6.7 Cell balance

BMS could balancing individual cell at standby and charging mode through power consumption circuit. When any individual cell voltage is higher than equalization start voltage and the voltage difference exceeds the threshold, the equalization circuit flows. The equalization start voltage threshold is configurable. When connected with charger or the voltage difference lower than setting threshold, equalization stops.
6.8 Power on/off

Item

Function

Power on/Start 1

Power off/Sleep 2
6.9 Storage

Definition BMS can be activated by pressing reset button at sleeping mode. The LED indicators will be lighten one by one. Then the BMS enters running status.
BMS will enter sleep mode if hold the reset button for 3 seconds at standby or discharging mode. The LED indicators will blink one by one. Then enters sleep mode.

BMS comes with data storage module, the data includes protection and warning status, protection and warning recovery time, individual cell voltage, pack cell total voltage, charging/discharging capacity, current and temperature. BMS could record the information of a certain period of time through upper computer system. No less than 300 pieces of information can be stored. And all the data can be saved into your computer as excel files.

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7. Size and dimension

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8. Appearance

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8.1 Wire introduction

Wire Harness A (Black connector)

CELL1-

The negative terminals of 1st cell

CELL1+

The positive terminals of 1st cell

CELL2+

The positive terminals of 2nd cell

CELL3+

The positive terminals of 3rd cell

CELL4+

The positive terminals of 4th cell

NTC1+

The temperature sensor NTC1

NTC1-

The temperature sensor NTC1

CELL5+

The positive terminals of 5th cell

CELL6+

The positive terminals of 6th cell

CELL7+

The positive terminals of 7th cell

CELL8+

The positive terminals of 8th cell

NTC2+

The temperature sensor NTC2

NTC2-

The temperature sensor NTC2

Wire Harness B (White connector)

CELL9-

The negative terminals of 9th cell

CELL9+

The positive terminals of 9th cell

CELL10+ The positive terminals of 10th cell

CELL11+ The positive terminals of 11th cell

CELL12+ The positive terminals of 12th cell

NTC3+

The temperature sensor NTC3

NTC3-

The temperature sensor NTC3

CELL13+ The positive terminals of 13th cell

CELL14+ The positive terminals of 14th cell

CELL15+ The positive terminals of 15th cell

CELL16+ The positive terminals of 16th cell

NTC4+

The temperature sensor NTC3

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NTC4-

The temperature sensor NTC3

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8.2 Wiring
Connection: B- WIRE HARNESS A WIRE HARNESS B B+ P+ charger/loads P- (After wiring, press the reset button to activate the BMS.) Disconnection: unconnected charger or loads, turn off the BMS and disconnect WIRE HARNESS B WIRE HARNESS A BInput and output: Charging: Connect the positive of charger with BMS P+, and the negative of the charger with BMS P-. Discharging: Connect the positive of loads with BMS P+, and the negative of the loads with BMS P-.
9. Communication introduction

9.1 CAN and RM485
BMS transmit information through CAN interface. Buad rate 500KBITS/S. CAN interface applies 8P8C connectors. And CAN connector communicates with inverter or CAN TEST. RS485 collect the information. Then CAN transmit the battery pack information to PCS. CAN connector definition:

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SEPLOS 16S 200A SMART BMS USER MANUAL
PINS 1/8 2/7 4 5 3/6

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DEFINITION RS485-B RS485-A CAN-H CAN-L GROUND

9.2 RS485

BMS could collect battery pack information through communication. Baud rate: 19200bps. RS485 interface applies 8p8c connectors. RS485 connectors definition:

RS485

PINS

DEFINITION

1/8

RS485-B

2/7

RS485-A

3/6

GROUND

4/5

Internal

communication (NC)

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9.3 Parallel
When connected in parallel with RS485 connectors. CAN connectors act as upper communication interface. End devices could get the collected battery information through CAN interface. RS485 connector connection:

9.4 DIP switch DIP ADDRESS: If the battery packs is connected in parallel, the DIP address identifies each pack with different addresses. Bit 1 to 4 for different address of paralleled packs. Bit 5 to 8 for the quantity of slave packs. Check Appendix for details. 9.5 Auto-identification
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10. LCD screen

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11. Safety precautions
The BMS can not be connected in series. The components of the BMS withstand voltage of 100V most. Do not connect the external switch with other devices without
permission. Or SEPLOS will not responsible for any damage that cause. Do not make any contact with the surface of battery cell when installing. Or the cell may be damaged. Do not make any contact with the components of the PCB. Or the PCB may be damaged. Operating at dry and dust free room. Check if the BMS is correctly connected if no voltage input and output after instillation. Follow the guidance and use of conditions specified in the data sheet. All right reserved.

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Room 301, Building 6, No. 179 Kangyi Road, Qingxi Town, Dongguan, Guangdong, China
TEL : (86) 15079804024 E-mail: info@seplos.com Site: www.seplos.com