# Etrel AC charger

> Supported devices: Inch Pro, Inch Duo.

Source: https://voltmasters.io/en/docs/device-integrations/ev-chargers/etrel-ac-charger/

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.
   
   > **Note**
   >
   > 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.](https://voltmasters.io/assets/docs/image-22.webp)
   
   -   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.](https://voltmasters.io/assets/docs/image-24.webp)
   
   -   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.](https://voltmasters.io/assets/docs/image-23.webp)
       
   -   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.](https://voltmasters.io/assets/docs/image-25.webp)
   
   -   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**
   >
   > *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).