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ESP32 SmartMeter that reads Kaifa MA309 data, converts it to Sunspec and provides it via Modbus RTU server

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LuckyLuke9877/smartmeter

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Overview

ESP32 SmartMeter that reads data from Kaifa MA309 and converts it to Sunspec data model on Modbus server. Using Esphome framework providing web-ui and OTA-update.

Credits

This is an extension of this project. Thanks a lot for the good work.

Tested with

  • Fronius Gen24 inverter: config => "Kommunikation/Modbus RTU" as "Master"; add "Komponente/Primärzähler"
  • Kaifa MA309 on VKW ( Vorarlberg Netz ). Note: Needs security key from energy provider.
  • Note: MQTT was not used and never tested

HW

  • esp32 Lilygo RS485 / CAN. CAN-bus is not needed.
  • M-Bus board
  • wiring is similar to "credits" project, but see m-bus definitions in smart_meter.yaml for Lilygo board
  • Fronius wiring: Modbus RTU shield, +, - to esp.RS485 A, B

Description

  • Kaifa broadcasts data in ~5sec interval
  • receive data via M-Bus and convert them to Sunspec data model
  • provide data on Modbus RTU - server
  • Fronius inverter reads data in ~1sec interval
  • if everything works correct, esp.led blinks green

Build SW

  • read the "SW installation" in the "credits" - project ( add your security key )
  • for USB connection run (use your ttyUSB): "esphome run ./smart_meter.yaml --device /dev/ttyUSBx"
  • for Wifi connection run (use your local address): "esphome run ./smart_meter.yaml --device 192.168.xxx.xxx"
  • optional build / run the tests in "test" folder
    • smart_meter_client: used to test the Modbus - server communication with an other Lilygo board running a Modbus - client
    • GTest: for Sunspec model and Modbus - server

Known issues

  • "cos-phi" is low on low energy flows

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ESP32 SmartMeter that reads Kaifa MA309 data, converts it to Sunspec and provides it via Modbus RTU server

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