Fronius Inverters Shut Down and Restart

Restarting your inverter can help clear communication issues, WiFi disconnections, or minor faults. Always follow the correct shutdown and start-up sequence to protect your system and ensure safety.

Before you start

• Make sure it’s daylight, as the inverter needs solar input from the panels to start up.
• If your system includes a battery or backup unit, check that there are no ongoing backup operations before restarting.
• Never restart during a lightning storm or when system components appear damaged.

Fronius GEN24 and GEN24 Plus Series

1. Switch off the AC power

Use the AC isolator or main switch for the inverter near your switchboard.

Turn it OFF.

2. Switch off the DC isolator

Located under the inverter or beside it. Turn it OFF.

3. Wait 1–2 minutes

The LED ring and display will go dark when fully powered down.

4. Switch the DC isolator back ON

Turn the DC switch ON and wait a few seconds.

5. Switch the AC isolator back ON

Turn the AC switch ON.

6. Allow inverter to restart

The LEDs will flash during startup.

A solid green light indicates normal operation, and a solid blue light confirms WiFi is connected

7. Check Solar.web monitoring

Confirm that the system data is updating normally.

Fronius Primo/Symo Series

1. Turn off the AC supply

Locate the Solar Inverter Main Switch or AC isolator (often near the switchboard).

Switch it OFF.

2. Turn off the DC isolator(s)

Found next to or below the inverter, usually labelled PV Array DC Isolator.

Switch it OFF.

3. Wait 1–2 minutes

Allow the inverter’s display and lights to turn off completely.

4. Turn the DC isolator(s) back ON

Switch the DC isolator(s) to the ON position.

5. Turn the AC supply back ON

Switch the Solar Inverter Main Switch or AC isolator ON again.

6. Wait for the inverter to boot up

The display should show normal startup messages and a green power LED once generating.

If applicable, check for a solid blue WiFi light (connected).