Fronius Inverters WiFi Reconnect

Fronius Primo/Symo Series

1. Check the WiFi signal at your inverter

• First, make sure your home WiFi is working as it should — check that you can connect to it on your phone or tablet.
• Use a tablet or laptop for the setup if you can, as the larger screen makes things easier.
• If you’ve changed providers, swapped your modem/router, or updated your WiFi name (SSID) or password, you’ll need to reconnect the inverter using the new details.

2. Turn on the inverter’s WiFi access point

• On the inverter screen, press the Back or Menu button to open the Setup menu.
• Navigate to Setup → Wi-Fi Access Point → Activate / Enable.
• The inverter will start broadcasting a WiFi network that begins with FRONIUS_240.XXXXXX.
• The default password is usually 12345678, unless the inverter label lists a different one or your installer has set a custom password.

3. Connect your device to the inverter hotspot

• Open the WiFi settings on your phone, tablet, or computer and join the network starting with FRONIUS_240.
• Enter the password 12345678 (or the unique password provided).

4. Open the inverter’s web interface

• Once you’re connected to the inverter hotspot, open a web browser (such as Chrome).
• Type 192.168.250.181 into the address bar and hit Enter.
• When the Fronius interface loads, log in as Customer (or Installer, if relevant).
• If you’re unsure of the login password, reach out to your installer.

5. Add your home WiFi details inside the inverter

• Inside the web interface, go to
  Settings → Network (or Communication → Network, depending on the model).
• Scroll to the bottom of the Network Settings section and select the home WiFi network you want to connect to.
• Click Set, enter your WiFi password, then press Save or Apply.
• When prompted, confirm you want the new settings to take effect (usually a tick or checkmark icon).

6. Make sure the connection is working

• On the inverter screen, go to Setup → Network → Status.
• Check that the inverter now has a valid IP address — if it shows 0.0.0.0, it hasn’t connected yet.
• You can also confirm connection by logging into your Fronius Solar.web portal and checking if live data is updating.

If you run into issues

• If the signal at the inverter location is weak, try moving your modem/router closer or install a WiFi extender.
• Double-check your WiFi password, including uppercase letters and special characters.
• If it still won’t connect, restart the process from Step 2 and try again.
• Ongoing problems may require a firmware update or assistance from your installer or Fronius Support.

Fronius GEN24 and GEN24 Plus Series

1. Check the WiFi signal at your inverter

• First, make sure your home WiFi is working as it should — check that you can connect to it on your phone or tablet.
• Use a tablet or laptop for the setup if you can, as the larger screen makes things easier.
• If you’ve changed providers, swapped your modem/router, or updated your WiFi name (SSID) or password, you’ll need to reconnect the inverter using the new details.

2. Try a power cycle before reprogramming

• If you haven’t changed internet providers or updated your WiFi details, start with a simple power cycle.
• Turn AC off using the main switch or inverter breaker.
• Turn DC off using the isolator next to the inverter.
• Wait until the screen fully shuts down, then turn DC back on, followed by AC.
• When the inverter powers up again, check for a solid blue light — this means it has reconnected to WiFi.
• If the light doesn’t go solid, continue with the reconnection steps below.

3. Enable the inverter’s WiFi access point

• Press and hold the inverter’s middle button until the WiFi light above the icon begins to flash.
• This switches on the inverter’s internal WiFi hotspot.

4. Connect your device to the inverter hotspot

• Open the WiFi settings on your phone or tablet and find the network beginning with FRONIUS_240.XXXXXX.
• Select it and connect.
• Use the default password 12345678 unless you’ve been given a different one.
• Wait until your device confirms it’s connected before moving on.

5. Open the inverter’s built-in web page

• Open a web browser (Chrome or Safari recommended).
• Type 192.168.250.181 in the address bar and press Enter.
• You should now see the inverter’s local interface with live system information.

6. Log in to the communication menu

• Tap the menu icon (three horizontal lines) in the top right.
• Select Communication.
• Choose Customer as the login level.
• Enter your customer password — this is normally supplied by your installer at the time of installation.

7. Add your home WiFi details

• Once logged in, open the menu again and choose Network.
• Stay connected to the FRONIUS_240 network during this step.
• Select Wi-Fi from the centre tab.
• A list of available WiFi networks will appear.
• Select your home WiFi name, type in the correct password, and save the settings.
• Once saved, the inverter will disconnect from its hotspot and attempt to join your home WiFi.

8. Check that the connection is successful

• Give the inverter a moment and then look at the WiFi indicator:
  • Solid blue = successfully connected
  • Flashing = still attempting to connect
• You can also confirm the connection by checking if your data is updating on Fronius Solar.web.

Troubleshooting if it still won’t connect

• If the inverter can’t detect your home WiFi, consider adding a WiFi extender or using an Ethernet option.
• Make sure you’ve entered the WiFi password exactly — upper and lower case must match.
• If the connection still fails, restart the inverter and repeat the process beginning from Step 3.
• If problems continue, contact your installer or Fronius Support for help.