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Device integrations

Etrel AC charger

Supported devices: Etrel Duo and Mono.

Supported devices

  • Duo: the Etrel INCH Duo, with two connectors.
  • Mono: the single-connector build. Requires EMS controller version 0.0.331 or later; on an older controller every Etrel is reported with two connectors.

Both models use the same Modbus TCP integration and the same setup below.

  1. Startup and connection

    Once all wiring is complete, switch on the charger.

    • Wait for Green: The green LED flashes during startup. Wait until it turns solid green; the charger is now ready for use. This LED is located just above the charger display.
    • Open Web Interface: Connect your laptop to the same network as the charger. Enter the IP address (found on the sticker inside the maintenance door) into your browser.

    Tip: Can't find the IP address? Press and hold the small reset button (inside the small door on the top right) until you hear a beep. This accesses the charging station settings. Navigate to the correct sub-menu on the screen to view the current IP address.

  2. Settings and Modbus

    Log in and go to the configuration page.

    The login page of the Etrel charger web interface, with the language list open on English.
    • Email: root@etrel.com
    • Password: toor
    • IP Configuration: Preferably set a static IP address within the same range as the Voltmaster Controller.
    The Etrel Ethernet connectivity page in five numbered steps, with DHCP switched off and a fixed IPv4 address, netmask, gateway and DNS, then Save.

    • Enable Modbus: Go to the settings menu and activate Modbus TCP.

      • Settings: Unit ID = 1, Port = 502.
      The Etrel smart building connectivity page with Modbus communication enabled on TCP port 502, a monitoring interval of 10 seconds and a fallback current of 6 A.

    • Firewall: Ensure Port 502 and Subnet 255.255.255.0 are open.

  3. Restart the charger

    Important: After changing the network or Modbus settings, you must restart the charging station to ensure the new configuration takes effect.

    • Action: Reboot the charger via the web interface or by power cycling the unit.
    The Etrel diagnostics page with Restart device highlighted, alongside the device versions and the meter values per connector.
    • Wait: Wait until the LED above the display turns solid green again.

  4. Safety check and completion

    • Protection: Verify that the Residual Current Device (RCD) and Miniature Circuit Breaker (MCB) are active.

    Note: For Etrel INCH models without built-in protection, these must be installed externally in the main distribution board.

    • LED Status Check (above Display):
      • Green: Available.
      • Flashing Blue: Charging in progress.
      • Red: Error (inspection required).