Example YAML with 3x batteries: https://github.com/easybotics/esphome-ruixu-bms/blob/main/esp32-s3-ruixu-multiple-example.yaml
Hardware used:
-
M5Stack ESP32 S3 Lite: https://docs.m5stack.com/en/core/AtomS3%20Lite
-
Same on Digikey: https://www.digikey.com/en/products/detail/m5stack-technology-co-ltd/c124/18070571
-
M5Stack RS485 Isolated Transceiver: https://docs.m5stack.com/en/unit/iso485
-
Same on Digikey: https://www.digikey.com/en/products/detail/m5stack-technology-co-ltd/u094/13913913
type: entities
entities:
- entity: sensor.bms_batt_3_state_of_charge
name: SOC %
state_header: batt 3
type: custom:multiple-entity-row
styles:
width: 40px
hide: true
unit: false
entities:
- entity: sensor.bms_batt_0_state_of_charge
name: batt 0
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_1_state_of_charge
name: batt 1
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_2_state_of_charge
name: batt 2
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_3_voltage_total
name: Voltage Total V
state_header: batt 3
type: custom:multiple-entity-row
styles:
width: 40px
unit: false
entities:
- entity: sensor.bms_batt_0_voltage_total
name: batt 0
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_1_voltage_total
name: batt 1
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_2_voltage_total
name: batt 2
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_3_power_net
name: Power kW
state_header: batt 3
type: custom:multiple-entity-row
styles:
width: 40px
unit: false
entities:
- entity: sensor.bms_bank_power_net
name: total
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_0_power_net
name: batt 0
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_1_power_net
name: batt 1
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_2_power_net
name: batt 2
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_3_current
name: Current A
state_header: batt 3
type: custom:multiple-entity-row
styles:
width: 40px
unit: false
entities:
- entity: sensor.bms_bank_current
name: total
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_0_current
name: batt 0
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_1_current
name: batt 1
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_2_current
name: batt 2
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_3_voltage_cell_max
name: Cell Max V
state_header: batt 3
type: custom:multiple-entity-row
styles:
width: 40px
unit: false
entities:
- entity: sensor.bms_bank_voltage_cell_max
name: max
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_0_voltage_cell_max
name: batt 0
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_1_voltage_cell_max
name: batt 1
unit: false
styles:
width: 40px
- entity: sensor.bms_batt_2_voltage_cell_max
name: batt 2
unit: false
styles:
width: 40px
Connect to the LINK OUT port only - I used pins 7 / 8 - connect the green GND pair to the RS485 GND connection point
Connect the two middle CAN pair (blue) to your inverter BMS CAN port - keep the Green pair connected
White Brown: A
Brown: B
Green Pair: GND
Cell voltage Max / Min getting closer over multiple cycles :) showing the balancing is doing something!
ESPHome component to monitor Seplos BMS via UART or RS485
- 1101-SP05 (reported by @JacquesdeBruyn)
- 1101-SP15 (reported by @NosIreland)
- 1101-SP16 (reported by @atze09)
- 1101-ZH26 (reported by @faizan-elite)
- 1101-MZ02 (reported by @fajera81)
- 1101-SP76 (reported by @bagges)
- 1101-SP101, PUSUNG-135 (reported by @manznOnly)
- 1101-10E-SP76-16S (reported by @tobox)
- 1101-10E-JK06-16S (Apex 48200, Apex BMS 48V200A, reported by @Pho3niX90)
- Boqiang BMS007-LD43-16S-HW (reported by @xdilian) requires custom settings
protocol_version: 0x26 override_pack: 1 - Boqiang BMS001-HS01-15S (reported by @xdilian) requires custom settings
protocol_version: 0x26 override_pack: 1 override_cell_count: 10 - Seplos BMS V3.0 Type C, B-48200-C (BMS16S200A-SP05B, FW 1.3, @Goaheadz) using esp8266-seplos-v3-example.yaml
- EMU10xx
- 11XX Series
RS485 UART
┌────────────┐ ┌──────────┐ ┌─────────┐
│ │ │ │<----- RX ----->│ │
│ Seplos │<-----B- ---->│ RS485 │<----- TX ----->│ ESP32/ │
│ BMS │<---- A+ ---->│ to TTL │<----- GND ---->│ ESP8266 │
│ │<--- GND ---->│ module │<----- 3.3V --->│ │<-- VCC
│ │ │ │ │ │<-- GND
└────────────┘ └──────────┘ └─────────┘
Please make sure to power the RS485 module with 3.3V because it affects the TTL (transistor-transistor logic) voltage between RS485 module and ESP.
| Pin | Purpose | RS485-to-TTL pin | Color T-568B |
|---|---|---|---|
| 1 | B- | B- | Orange-White |
| 2 | A+ | A+ | Orange |
| 3 | GND | GND | Green-White |
| 4 | NC | ||
| 5 | NC | ||
| 6 | GND | ||
| 7 | A+ | ||
| 8 | B- |
Please be aware of the different RJ45 pinout colors (T-568A vs. T-568B).
- ESPHome 2024.6.0 or higher.
- Generic ESP32 or ESP8266 board
You can install this component with ESPHome external components feature like this:
external_components:
- source: github://syssi/esphome-seplos-bms@mainor just use the esp32-example.yaml as proof of concept:
# Install esphome
pip3 install esphome
# Clone this external component
git clone https://github.com/syssi/esphome-seplos-bms.git
cd esphome-seplos-bms
# Create a secrets.yaml containing some setup specific secrets
cat > secrets.yaml <<EOF
wifi_ssid: MY_WIFI_SSID
wifi_password: MY_WIFI_PASSWORD
mqtt_host: MY_MQTT_HOST
mqtt_username: MY_MQTT_USERNAME
mqtt_password: MY_MQTT_PASSWORD
EOF
# Validate the configuration, create a binary, upload it, and start logs
# If you use a esp8266 run the esp8266-examle.yaml
esphome run esp32-example.yaml
[I][seplos_bms:031]: Telemetry frame received
[D][sensor:124]: 'seplos-bms cell voltage 1': Sending state 3.28800 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 2': Sending state 3.30400 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 3': Sending state 3.31600 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 4': Sending state 3.28700 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 5': Sending state 3.31000 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 6': Sending state 3.30100 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 7': Sending state 3.29700 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 8': Sending state 3.29300 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 9': Sending state 3.30500 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 10': Sending state 3.31200 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 11': Sending state 3.30400 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 12': Sending state 3.31100 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 13': Sending state 3.30700 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 14': Sending state 3.29000 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 15': Sending state 3.29400 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms cell voltage 16': Sending state 3.28900 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms min cell voltage': Sending state 3.28700 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms max cell voltage': Sending state 3.31600 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms max voltage cell': Sending state 3.00000 with 0 decimals of accuracy
[D][sensor:124]: 'seplos-bms min voltage cell': Sending state 4.00000 with 0 decimals of accuracy
[D][sensor:124]: 'seplos-bms delta cell voltage': Sending state 0.02900 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms average cell voltage': Sending state 3.30050 V with 3 decimals of accuracy
[D][sensor:124]: 'seplos-bms temperature 1': Sending state 29.82000 °C with 0 decimals of accuracy
[D][sensor:124]: 'seplos-bms temperature 2': Sending state 29.76000 °C with 0 decimals of accuracy
[D][sensor:124]: 'seplos-bms temperature 3': Sending state 29.67000 °C with 0 decimals of accuracy
[D][sensor:124]: 'seplos-bms temperature 4': Sending state 29.82000 °C with 0 decimals of accuracy
[D][sensor:124]: 'seplos-bms environment temperature': Sending state 29.81000 °C with 0 decimals of accuracy
[D][sensor:124]: 'seplos-bms mosfet temperature': Sending state 29.78000 °C with 0 decimals of accuracy
[D][sensor:124]: 'seplos-bms current': Sending state -6.54000 A with 2 decimals of accuracy
[D][sensor:124]: 'seplos-bms total voltage': Sending state 52.80000 V with 2 decimals of accuracy
[D][sensor:124]: 'seplos-bms power': Sending state -345.31198 W with 2 decimals of accuracy
[D][sensor:124]: 'seplos-bms charging power': Sending state 0.00000 W with 2 decimals of accuracy
[D][sensor:124]: 'seplos-bms discharging power': Sending state 345.31198 W with 2 decimals of accuracy
[D][sensor:124]: 'seplos-bms residual capacity': Sending state 133.86000 Ah with 2 decimals of accuracy
[D][sensor:124]: 'seplos-bms battery capacity': Sending state 170.00000 Ah with 2 decimals of accuracy
[D][sensor:124]: 'seplos-bms state of charge': Sending state 78.70000 % with 1 decimals of accuracy
[D][sensor:124]: 'seplos-bms rated capacity': Sending state 180.00000 Ah with 2 decimals of accuracy
[D][sensor:124]: 'seplos-bms charging cycles': Sending state 70.00000 with 0 decimals of accuracy
[D][sensor:124]: 'seplos-bms state of health': Sending state 100.00000 % with 1 decimals of accuracy
[D][sensor:124]: 'seplos-bms port voltage': Sending state 52.79000 V with 2 decimals of accuracy
None.
See SEPLOS BMS Communication Protocol_V2.0.pdf and Seplos 48v 100A BMS RS485 Protocol.pdf.
$ echo -ne "~20004642E00200FD37\r" | hexdump -ve '1/1 "%.2X."'
7E.32.30.30.30.34.36.34.32.45.30.30.32.30.30.46.44.33.37.0D.
# Get pack #0 telemetry data (CID2 `0x42`)
TX -> "~20004642E00200FD37\r"
RX <- "~2000460010960001100CD70CE90CF40CD60CEF0CE50CE10CDC0CE90CF00CE80CEF0CEA0CDA0CDE0CD8060BA60BA00B970BA60BA50BA2FD5C14A0344E0A426803134650004603E8149F0000000000000000DC6C\r"
# Get system parameters (CID2 `0x47`)
TX -> "~200046470000FDA9\r"
RX <- ?
# Get protocol version (CID2 `0x4F`)
TX -> "~2000464F0000FD9A\r"
RX <- ?
# Get manufacturer info (CID2 `0x51`)
TX -> "~200046510000FDAE\r"
RX <- "~20004600C040313130312D5350313520020743414E50726F746F636F6C3A536F666172202020F046\r"
# Get management info (pylontech only?)
TX -> "~200046920000FDA9\r"
RX <- ?
# Get module serial number (pylontech only?)
TX -> "~200046930000FDA8\r"
RX <- ?
If this component doesn't work out of the box for your device please update your configuration to enable the debug output of the UART component and increase the log level to the see outgoing and incoming serial traffic:
logger:
level: DEBUG
uart:
id: uart_0
baud_rate: 9600
tx_pin: ${tx_pin}
rx_pin: ${rx_pin}
rx_buffer_size: 384
debug:
dummy_receiver: false
direction: BOTH
after:
delimiter: "\r"
sequence:
- lambda: UARTDebug::log_string(direction, bytes);
- https://github.com/Frankkkkk/python-pylontech/blob/master/pylontech/pylontech.py
- https://diysolarforum.com/threads/simple-seplos-bms-protocol-decode-bash-script.34993/
- https://github.com/celsworth/lxp-pylon-utils/tree/master/lib/pylon/packet
- https://github.com/meteosat007/solar-pylontech
- https://github.com/BrucePerens/seplos_c