Fronius Shut down and Restart Guide
Primo / Symo series
Before You Start
- Make sure it is daylight — the inverter needs solar input from the panels to start up
- If your system includes a battery or backup unit, check there are no ongoing backup operations before restarting
- Never restart during a lightning storm or when system components appear damaged
1. Turn off the AC supply
Locate the Solar Inverter Main Switch or AC isolator — often located near the switchboard.
- Switch it OFF
2. Turn off the DC isolator
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 before continuing.
4. Turn the DC isolator back ON
Switch the DC isolator 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 once generating.
- A green power LED confirms the system is running
- A solid blue Wi-Fi light confirms it is connected to the network (if applicable)
GEN24 / GEN24 Plus series
Before You Start
- Make sure it is daylight — the inverter needs solar input from the panels to start up
- If your system includes a battery or backup unit, check there are no ongoing backup operations before restarting
- Never restart during a lightning storm or when system components appear damaged
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 or beside the inverter.
- 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 the inverter to restart
The LEDs will flash during startup.
- A solid green light indicates normal operation
- A solid blue light confirms Wi-Fi is connected
7. Check Solar.web monitoring
Confirm that system data is updating normally in the Fronius Solar.web portal or app.
