1- Installation and connection

Put the antenna on the OPENDTU-DIN
Connect your OPENDTU-DIN with a USB cable (MicroUSB) + a 5V – 3A power supply
Position your OPEN DTU in your table by lowering the tab at the back. and then reassembling it so that it locks the OPENDTU-DIN on the rail.

2- Configuring your OPENDTU​

2.1 – We have already provided you with a pre-flashed version with OPENDTU on the ESP32. You don’t need to do this step 😉

2.2 – Now connect the card to the power supply using a USB to micro USB or USB-C cable depending on availability.

2.3 – At the first start, we will connect to the AP-WIFI connection of the controller, which will allow us to configure OPENDTU-DIN so that it is visible on your home wifi. (Please note you need a 2.4Ghz 802.11 b/g/n (802.11n at 150 Mbps) WPA and WPA2 encryption connection. The old WEP encryption protocol is not supported.), the card automatically starts a WIFI connection (by e.g. OpenDTU-126858)

2.4 – Connect to this Wifi using your laptop or mobile phone. The password is “openDTU42” (Case sensitive).


3- Connection to the OPENDTU interface

3.1 – Click on “Connect to Wifi” or enter the address “” in your browser.

3.2 – Navigate via Burger menu to Settings -> Network Settings and log in with username “admin” and “openDTU42”.

3.3 – Enter the name of your WiFi network and the password to connect to it.
If your home wifi network uses an allow list for MAC addresses, please note that the ESP32 has two different MAC addresses for its AP and client modes, listed under Info -> Network.

3.4 – Press “Save”. The controller will restart.

3.5 – Wait 😉

4- Add your Microinverter(s)

4.1 – After restarting it will show you the IP address on the screen.

4.2 – Take the IP address displayed on the openDTU screen. Open your internet browser and enter it in the address bar with the prefix “http://” (for example

4.3 – Now that you are connected to the interface, we will add your inverter(s) in the OpenDTU browser page (see photo)
via Settings -> Inverter (you need the serial number found on the microinverter).