esphome-jk-bms-can

ESPHome component to monitor a Jikong Battery Management System (JK-BMS) via RS485 or BLE

This fork supports CAN bus communication with inverters supporting the CANBUS Protocol compatible with Pylontech V1.3 and Goodwe V1.5.

Note Pylontech uses 15s/48v Goodwe uses 16s/51.2v @3.2v/cell nominal. Other battery profiles that utilise the pylonton/goodwe protocol with differnt cell counts may also work, eg Alpha Ess Smile, BYD Battery-Box LV Flex Lite Select the correct battery profile in the inverter to match your battery pack!

New: Plug and play Hardware interface see here for more info

The ESP32 communicates with the JK-BMS using the RS485 port(GPS) which is in fact not RS485, it is 3.3V TTL so it can be directly connected to the ESP32. The ESP32 then sends the required CAN bus data to the inverter via a TJA1050 CAN bus transceiver.

Sends over CAN bus to inverter:

Battery Voltage
Battery Current (+charge, -discharge)
State of Charge (SOC)
State of health (SOH)
BMS Temperature
Charging Voltage
Charging Amps
Discharge min Voltage
Battery name
Alarms: Cell over/under voltage, Charge/discharge over current, High/low Temp, BMS fault
Charging logic: Complete rework of the charging logic, now charges with constant current(CC) to the absorption voltage, then has an absorption timer (Constant Voltage, user configurable time), with rebulk feature (user configurable offset from absorption voltage).

Note:- The standard code support one BMS connection per inverter. Multi BMS support availabe for Alpha testers
Early stages are under way to support multiple BMS, but need funding to purchase additional hardware, please consider supporting me if you would like to see this functionally, early access code with be made available in the Alpha testers: https://www.patreon.com/Uksa007Codedevelopment

NOTE: ESP32 has a bug that causes WDT reboot if no other devices on CAN bus to ACK the packets. If you try to run without inverter it will not work as it will constantly WDT reboot! There is an early access beta version available that works around no inverter(CAN bus requires 2 devices to work)

Home Assistant native integration via ESPHome:

Inverter control switches to manage inverter remotely
- Disable inverter charging
- Disable inverter discharging
- Enable inverter charging (top balancing)
All BMS sensor vaules listed below

I have been testing using the Goodwe LX U5.4-L battery profile selected in the inverter.
Each LX U5.4-L battery has 5.4kWh of storage, so select the number that is the closest match to your battery's total capacity.

Note:- I'm using this with my Goodwe GW5000S-BP inverter however CAN bus support is still in development and testing!!!
Further deatils in the discussion tab https://github.com/Uksa007/esphome-jk-bms-can/discussions

If you find this useful and would like to suppport my work here thanks!

NOTE: ESP32 has a bug that causes WDT reboot if no other devices on CAN bus to ACK the packets.
If you try to run without inverter to CAN bus it will NOT work as it will constantly WDT reboot!
There is an early access beta version available that works around no inverter(CAN bus requires 2 devices to work).
If you would like to test without inverter connected, only the beta version will work!

Connect a TJA1050 to an ESP32 (default GPIO 23 TX, 22 RX) as per https://esphome.io/components/canbus.html?highlight=can#wiring-options
Use this code in esphome https://github.com/Uksa007/esphome-jk-bms-can/blob/main/esp32-example-can.yaml
(optional) A second ESP32 and TJA1050 make a test CAN bus/receiver https://github.com/Uksa007/esphome-jk-bms-can/blob/main/test-esp32-receiver-can.yaml If you don't yet have TJA1050 you can still test with two ESP32 by making a makeshif CAN bus DO NOT CONNECT TO A REAL CAN BUS! Add a blocking diode between the CAN-TX and CAN-RX pins (cathode towards the CAN-TX pin) at both ESP32s! So a Diode between GPIO5, GPIO4 diode cathode to GPIO5 at both ESP32 Then tie the CAN-RX lines together with a pull-up resistor to 3.3V I used 10K pullup.

Home Assistant intergration

Supported devices

Inverters supporting CAN Pylon/Goodwe Low Voltage protocol should work, check your inverter manual to confirm.

The following are confirmed and known to work:

Deye 5k-sg03lp1-eu (reported by @vdiex)
Deye SUN-12K-SG04LP3-EU (reported by @lucize)
Goodwe 3648-ES (GW5048-ES) (reported by @jirdol)
Goodwe GW5000S-BP (reported by @Uksa007 using the "Goodwe LX U5.4-L * 3" battery profile)
Sofar solar me3000sp (reported by @starman)
Turbo energy (reported by @ibikku)

All JK-BMS models with software version >=6.0 are using the implemented protocol and should be supported.

JK-BD6A17S6P, hw 7.2, sw 7.1.0H
JK-BD6A17S8P, hw 9.x, sw 9.01G (reported by @jonadis)
JK-BD6A20S10P, hw 10.XW, sw 10.07 (reported by @adadrag)
JK-BD6A24S6P, hw 6.x, sw 6.10S (reported by @ziporah)
JK-BD6A24S10P, hw 8.x, sw 8.0.6G (reported by @spoonwzd)
JK-BD4A17S4P, hw 11.xw, sw 11.01 (reported by @Condor-XYZ)
JK-B1A24S15P, hw 8.x, sw 8.1.0H (reported by @killee)
JK-B1A20S15P, hw 8.x, sw 8.14U (reported by @trippfam07)
JK-B2A24S15P, hw 6.x, sw 6.1.3S (reported by @miguel300477)
JK-B2A24S15P, hw 8.x, sw 8.21W (reported by @mariusvaida)
JK-B2A24S15P, hw 10.xw, sw 10.07
JK-B2A24S15P, hw 10.xw, sw 10.08 (reported by @meccip)
JK-B2A24S20P, hw 8.x, sw 8.1.2H (reported by @KlausLi)
JK-B2A24S20P, hw 8.x, sw 8.20G (reported by @rob-oravec)
JK-B2A24S20P, hw 10.X-W, sw 10.02 (reported by @SeByDocKy)
JK-B2A24S20P, hw 10.XG, sw 10.07D30 (reported by @TheSmartGerman)
JK-B2A24S20P, hw 10.XW, sw 10.07 (reported by @amagr0)
JK-B2A8S20P, hw 9.x, sw 9.01M3 (reported by @EasilyBoredEngineer)
JK-B2A8S20P, hw 9.x, sw 9.08W (reported by @vrabi-cv)
JK-B2A8S20P, hw 11.XW, sw 11.17 (reported by @senfkorn)
JK-B2A20S20P, hw 10.XW, sw 10.09 (reported by @markusgg84)
JK-B5A24S, hw 8.x, sw 8.0.3M, using JK04 (reported by @JSladen)
GW-24S4EB (NEEY/Heltec 4A Smart Active Balancer), hw HW-2.8.0, sw ZH-1.2.3 (reported by @cristi2005)

Untested devices

JK-BD6A20S6P

Requirements

ESPHome 2022.11.0 or higher.
Generic ESP32, I use the esp32doit-devkit-v1 NOTE: ESP32-S2 currently has issues with CAN BUS and does not work!
TJA1050 CAN controller interface module and 4.7K resistor for 5v to 3.3v level shifing.
Optional: JK RS485 Adaptor and RS484 to TTL3.3v Adaptor (see optional schematic below)

Schematics

I have designed and build a Hardware interface baord pictured below on the left. This has all the hardware needed to communicate with BMS and Inverter over CAN bus. It is a plug and play device, just add power (5v USB) Hand built on a PCB and soldered to the ESP32, bulletproof design for production use. Don't use modules and Dupont connectors for long term production use, they are for proof of concept and prototyping only, and are prone to fail. Update: now available with two RJ45 with Termination disabled for Multi BMS

                RS485-TTL                   RS232-TTL                CAN BUS
┌──────────┐            ┌─────────┐             ┌─────────┐              ┌──────────┐
│          │<TX------RX>│16     23│<TX-------TX>|         |              |          |
│  JK-BMS  │<RX------TX>│17     22│<RX--4K7--RX>| TJA1050 |<---CAN H --->| Inverter |
│          │<----GND--->│         │<----GND---->|   CAN   |<---CAN L --->|          |
│          │  3.3V ---->│  ESP32  │<----5V----->|         |              |          |
└──────────┘            └─────────┘             └─────────┘              └──────────┘



Optional below, as seen in pic above: RS485 between JK-BMS GPS port and ESP32, uses JK RS485 adaptor and RS485 to TTL3.3v adaptor.

              RS485-TTL                  RS485             RS485-TTL               RS232-TTL                CAN BUS
┌──────────┐            ┌───────────┐           ┌────────┐           ┌─────────┐             ┌─────────┐              ┌──────────┐
│          │<--- TX --->│Y    JK   Y│<A------A+>│        │<TX-----RX>│16     23│<TX-------TX>|         |              |          |
│  JK-BMS  │<--- RX --->│W  RS485  W│<B------B->│ RS485  │<RX-----TX>│17     22│<RX--4K7--RX>| TJA1050 |<---CAN H --->| Inverter |
│          │<--- GND -->│B Adaptor B│<---GND--->│To 3.3V │<---GND--->|         |<----GND---->|   CAN   |<---CAN L --->|          |
│          │<--Bat V -->│R          │           │        │<---3.3V-->|  ESP32  |<----5V----->|         |              |          |
└──────────┘            └───────────┘           └────────┘           └─────────┘             └─────────┘              └──────────┘



# RS485-TTL jack on JK-BMS (4 Pin, JST 1.25mm pitch)
┌─── ─────── ────┐
│                │
│ O   O   O   O  │
│GND  RX  TX VBAT│ 
└────────────────┘
  │   │   │   | VBAT is full battery volatge eg 51.2V (No connect)
  │   │   └──── ESP32 GPIO16 (`rx_pin`)
  │   └──────── ESP32 GPIO17 (`tx_pin`)
  └──────────── GND

The RS485-TTL jack of the BMS can be attached to any UART pins of the ESP. A hardware UART should be preferred because of the high baudrate (115200 baud). The connector is called 4 Pin JST with 1.25mm pitch.

Installation

You can install this component with ESPHome external components feature like this:

external_components:
  - source: github://uksa007/esphome-jk-bms-can@main

or just use the esp32-example-can.yaml as proof of concept:

# Install esphome
pip3 install esphome

# Clone this external component
git clone https://github.com/uksa007/esphome-jk-bms-can.git
cd esphome-jk-bms-can

# Create a secrets.yaml containing some setup specific secrets
cat > secrets.yaml <<EOF
wifi_ssid: MY_WIFI_SSID
wifi_password: MY_WIFI_PASSWORD

# Validate the configuration, create a binary, upload it, and start logs
esphome run esp32-example-can.yaml

# Optional add to Home Assistant
In Home Assistant under settings->Intergration "Add Intergration" select ESPHome add device jk-bms-can if found or supply ip address of ESP32

Example CAN messages

[main:141]: send can id: 0x359 hex: 0 0 0 0 3 0 0 0
[canbus:033]: send extended id=0x359 rtr=FALSE size=8
[main:187]: send can id: 0x351 hex: 28 2 e8 3 e8 3 a0 1
[canbus:033]: send extended id=0x351 rtr=FALSE size=8
[main:199]: send can id: 0x355 hex: 4f 0 64 0
[canbus:033]: send extended id=0x355 rtr=FALSE size=4
[main:213]: send can id: 0x356 hex: 63 14 62 fc 86 1
[canbus:033]: send extended id=0x356 rtr=FALSE size=6
[canbus:070]: received can message (#1) std can_id=0x305 size=8
[light:035]: 'Builtin LED' Setting:
[light:046]:   State: OFF
[main:238]: send can id: 0x35C hex: c0 0
[canbus:033]: send extended id=0x35c rtr=FALSE size=2
[canbus:033]: send extended id=0x35e rtr=FALSE size=8

Example response all sensors enabled

[sensor:125]: 'jk-bms-can cell voltage 1': Sending state 3.27200 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 2': Sending state 3.26900 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 3': Sending state 3.26800 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 4': Sending state 3.26700 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 5': Sending state 3.25000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 6': Sending state 3.26600 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 7': Sending state 3.25600 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 8': Sending state 3.26800 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 9': Sending state 3.25800 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 10': Sending state 3.26000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 11': Sending state 3.26200 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 12': Sending state 3.25700 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 13': Sending state 3.25700 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 14': Sending state 3.26000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 15': Sending state 3.26500 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage 16': Sending state 3.26800 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can min cell voltage': Sending state 3.25000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can max cell voltage': Sending state 3.27200 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can max voltage cell': Sending state 1.00000  with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can min voltage cell': Sending state 5.00000  with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can delta cell voltage': Sending state 0.02200 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can average cell voltage': Sending state 3.26269 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can power tube temperature': Sending state 39.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can temperature sensor 1': Sending state 26.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can temperature sensor 2': Sending state 26.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can total voltage': Sending state 52.20000 V with 2 decimals of accuracy
[sensor:125]: 'jk-bms-can current': Sending state -92.64000 A with 2 decimals of accuracy
[sensor:125]: 'jk-bms-can power': Sending state -4835.80762 W with 2 decimals of accuracy
[sensor:125]: 'jk-bms-can charging power': Sending state 0.00000 W with 2 decimals of accuracy
[sensor:125]: 'jk-bms-can discharging power': Sending state 4835.80762 W with 2 decimals of accuracy
[sensor:125]: 'jk-bms-can capacity remaining': Sending state 79.00000 % with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can temperature sensors': Sending state 2.00000  with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can charging cycles': Sending state 4.00000  with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can total charging cycle capacity': Sending state 1280.00000 Ah with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can battery strings': Sending state 16.00000  with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can errors bitmask': Sending state 0.00000  with 0 decimals of accuracy
[text_sensor:067]: 'jk-bms-can errors': Sending state ''
[sensor:125]: 'jk-bms-can operation mode bitmask': Sending state 3.00000  with 0 decimals of accuracy
[text_sensor:067]: 'jk-bms-can operation mode': Sending state 'Charging enabled;Discharging enabled'
[sensor:125]: 'jk-bms-can total voltage overvoltage protection': Sending state 57.60000 V with 2 decimals of accuracy
[sensor:125]: 'jk-bms-can total voltage undervoltage protection': Sending state 41.60000 V with 2 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage overvoltage protection': Sending state 3.60000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage overvoltage recovery': Sending state 3.55000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage overvoltage delay': Sending state 5.00000 s with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage undervoltage protection': Sending state 2.60000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage undervoltage recovery': Sending state 2.65000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can cell voltage undervoltage delay': Sending state 5.00000 s with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can cell pressure difference protection': Sending state 0.30000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can discharging overcurrent protection': Sending state 100.00000 A with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can discharging overcurrent delay': Sending state 300.00000 s with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can charging overcurrent protection': Sending state 100.00000 A with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can charging overcurrent delay': Sending state 30.00000 s with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can balance starting voltage': Sending state 3.40000 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can balance opening pressure difference': Sending state 0.00500 V with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can power tube temperature protection': Sending state 90.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can power tube temperature recovery': Sending state 70.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can temperature sensor temperature protection': Sending state 100.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can temperature sensor temperature recovery': Sending state 100.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can temperature sensor temperature difference protection': Sending state 20.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can charging high temperature protection': Sending state 70.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can discharging high temperature protection': Sending state 70.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can charging low temperature protection': Sending state -20.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can charging low temperature recovery': Sending state -10.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can discharging low temperature protection': Sending state -20.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can discharging low temperature recovery': Sending state -10.00000 °C with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can total battery capacity setting': Sending state 280.00000 Ah with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can capacity remaining derived': Sending state 221.19998 Ah with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can current calibration': Sending state 1.04800 A with 3 decimals of accuracy
[sensor:125]: 'jk-bms-can device address': Sending state 1.00000  with 0 decimals of accuracy
[text_sensor:067]: 'jk-bms-can battery type': Sending state 'Ternary Lithium'
[sensor:125]: 'jk-bms-can sleep wait time': Sending state 10.00000 s with 0 decimals of accuracy
[sensor:125]: 'jk-bms-can alarm low volume': Sending state 20.00000 % with 0 decimals of accuracy
[text_sensor:067]: 'jk-bms-can password': Sending state '123456'
[text_sensor:067]: 'jk-bms-can device type': Sending state 'Input Us'
[sensor:125]: 'jk-bms-can total runtime': Sending state 226.13333 h with 0 decimals of accuracy
[text_sensor:067]: 'jk-bms-can total runtime formatted': Sending state '9d 10h'
[text_sensor:067]: 'jk-bms-can software version': Sending state '10.XG_S10.07___'
[sensor:125]: 'jk-bms-can actual battery capacity': Sending state 256.00000 Ah with 0 decimals of accuracy
[text_sensor:067]: 'jk-bms-can manufacturer': Sending state 'Input UserdaJK-B2A24S15P'

Known issues

The battery type sensor is pretty useless because the BMS reports always the same value (Ternary Lithium). Regardless of which battery type was set / parameter set was loaded via the android app. (#9)
ESP32: Adding all supported sensors can lead to a stack overflow / boot loop. This can be solved by increasing the stack size. (#63)
BLE: Please stick to the esp-idf framework because the Arduino framework crashs on the first received BLE notification.
Raspberry Pi & ESP-IDF: If the project doesn't compile because of Error: Could not find the package with 'platformio/toolchain-esp32ulp @ ~1.22851.0' requirements for your system 'linux_aarch64' please use a host with another processor architecture (f.e. x86). The toolchain isn't linux_aarch64 (ARM64) compatible at the moment.
MQTT & BLE: Please use ESPHome >=2022.4.0 if you want to use the BLE component (requires esp-idf) and MQTT. The MQTT component wasn't ESP-IDF compatible until then.

Debugging

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: uart0
  baud_rate: 115200
  rx_buffer_size: 384
  tx_pin: GPIO14
  rx_pin: GPIO4
  debug:
    direction: BOTH

Name		Name	Last commit message	Last commit date
Latest commit History 4 Commits
components		components
LICENSE		LICENSE
README.md		README.md
SMA CAN Protocol Mapping.pdf		SMA CAN Protocol Mapping.pdf
esp32-ble-example-debug.yaml		esp32-ble-example-debug.yaml
esp32-ble-example-faker.yaml		esp32-ble-example-faker.yaml
esp32-ble-example-multiple-devices.yaml		esp32-ble-example-multiple-devices.yaml
esp32-ble-example.yaml		esp32-ble-example.yaml
esp32-ble-jk04-example-debug.yaml		esp32-ble-jk04-example-debug.yaml
esp32-ble-jk04-example-faker.yaml		esp32-ble-jk04-example-faker.yaml
esp32-ble-jk04-example.yaml		esp32-ble-jk04-example.yaml
esp32-example-can.yaml		esp32-example-can.yaml
esp32-example-debug.yaml		esp32-example-debug.yaml
esp32-example-faker.yaml		esp32-example-faker.yaml
esp32-example-multiple-devices.yaml		esp32-example-multiple-devices.yaml
esp32-example.yaml		esp32-example.yaml
esp32-heltec-balancer-ble-example-faker.yaml		esp32-heltec-balancer-ble-example-faker.yaml
esp32-heltec-balancer-ble-example.yaml		esp32-heltec-balancer-ble-example.yaml
esp8266-example-debug.yaml		esp8266-example-debug.yaml
esp8266-example-faker.yaml		esp8266-example-faker.yaml
esp8266-example.yaml		esp8266-example.yaml
lovelace-entities-card.png		lovelace-entities-card.png
lovelace-entities-card.yaml		lovelace-entities-card.yaml
setup.cfg		setup.cfg
test-esp32-receiver-can.yaml		test-esp32-receiver-can.yaml
test-esp32-send-can.yaml		test-esp32-send-can.yaml
test-esp32.sh		test-esp32.sh
test-esp8266.sh		test-esp8266.sh

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esphome-jk-bms-can

This fork supports CAN bus communication with inverters supporting the CANBUS Protocol compatible with Pylontech V1.3 and Goodwe V1.5.

Home Assistant intergration

Supported devices

Untested devices

Requirements

Schematics

Installation

Example CAN messages

Example response all sensors enabled

Known issues

Debugging

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esphome-jk-bms-can

This fork supports CAN bus communication with inverters supporting the CANBUS Protocol compatible with Pylontech V1.3 and Goodwe V1.5.

Home Assistant intergration

Supported devices

Untested devices

Requirements

Schematics

Installation

Example CAN messages

Example response all sensors enabled

Known issues

Debugging

References

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