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Battery to Home Assistant

Home Assistant speaks “ModBus language” to communicate with your Battery and vise versa. Use the configurations on this page and HomeBatteryControl will work out of the box.

Review the available connectors on your battery:

• A) Four string ModBus wire
  • Use an EspHome or RTU bridge device - communicates via Wifi to HA.
• B) RJ45 Ethernet port
  • Use a regular network cable, no extras needed.
• C) RJ45 ModBus port
  • Confusingly looks like an Ethernet port, but isn’t. Use Elfin EW11 to communicate via Wifi.

Decide wether you go WiFi or cable.

Reading tip

this Marstek topic on Tweakers.net (NL/BE) for detailed info curated by SuperDuper1969

Ready to use config for Marstek are found here

Ethernet cable (Venus V3 and Venus A/D only):

• Ethernet port RJ45 (not modbus RTU RJ45 port) : https://github.com/fonske/MarstekVenusV3-modbus-TCP-IP/tree/main

  Copy the YAML to /config/packages/ in Home Assistant folder

Esphome based - Modbus 4-string

• lilygo: Venus E V1/2: https://github.com/fonske/MarstekVenus-LilygoRS485/blob/main/lilygo_mt1.yaml
• lilygo: Venus E V3: https://github.com/fonske/MarstekVenus-LilygoRS485/blob/main/lilygo_mt1_v3.yaml
• lilygo poe: Venus E V3: https://github.com/Adam600david/Marstek-venus-V3-Lilygo-T-POE-pro/blob/main/MarstekVenus-Lilygo-T-POE-Pro%20MTforum.yaml (by Adam David)
• M5stack rs485 Atom s3: Venus E V1/2: https://github.com/fonske/MarstekVenus-M5stackRS485/blob/main/esphome/atom_s3_lite_rs485.yaml
• M5stack rs485 Atom s3: Venus V3: https://github.com/fonske/MarstekVenus-M5stackRS485/blob/main/esphome/atom_s3_lite_rs485_v3.yaml

Modbus RTU bridge to Modbus tcp/ip:

• Elfin EW11: Venus V1/2: https://github.com/fonske/MarstekVenusV3-modbus-TCP-IP/tree/v12

• Elfin EW11: Venus V3: https://github.com/fonske/MarstekVenusV3-modbus-TCP-IP/tree/main

  Copy the YAML to /config/packages/ in Home Assistant folder

Important notice

Home Battery Control assumes the sensor and entity names used in the Fonske projects above.

Using alternate naming or different code projects requires you to create HA helper entities to map values from your custom setup to the expected entities in the Home Battery Control (HBC) project.

Altering the mapping in the Node-RED flows is also possible, but less advised as this makes updating later on very cumbersome.

Special thanks to Fonske for his work and efforts to the project.

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