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Wi-Fi Setup

After startup, the device will act as an Access Point (AP) to allow (initial) configuration1.

  • After the initial flashing of the microcontroller, an Access Point called "OpenDTU-*" is opened. The default password is openDTU42.
  • Use a web browser to visit http://192.168.4.1.
  • The username to access config menus is "admin" and the password is the same as for accessing the Access Point (default: openDTU42).
  • Navigate to Settings --> Network Settings and enter your Wi-Fi credentials.
  • OpenDTU-OnBattery then simultaneously connects to your Wi-Fi AP with these credentials. Navigate to Info --> Network and look into section "Network Interface (Station)" for the IP address received via DHCP.
  • If your Wi-Fi AP uses an allow-list for MAC-addresses, please be aware that the ESP32 has two different MAC addresses for its AP and client modes. These MAC addresses are also listed at Info --> Network.
  • When OpenDTU-OnBattery is connected to a configured Wi-Fi AP as a client, the "OpenDTU-*" Access Point is closed after 3 minutes (timeout is configurable).

Note

  • OpenDTU-OnBattery needs access to a working NTP server to get the current date & time. Both are sent to the inverter with each request. Default NTP server is opendtu.pool.ntp.org. If your network has different requirements please change accordingly (Settings --> NTP Settings).
  • Add your inverter in the inverter settings (Settings --> Inverter Settings).

  1. The device always acts as an AP after booting, even if it is already configured as a Wi-Fi client. The AP is closed after a configurable timeout. ↩