SolarEdge – Error Code 109

SolarEdge – Error Code 109

Is your SolarEdge Solar Inverter showing up with Error Code 109 on the screen?

What is a SolarEdge Error Code 109?

Error Code 109 on your SolarEdge solar inverter indicates a problem with the AC (Alternating Current) power supply. This means that your inverter is having trouble converting the DC (Direct Current) electricity generated by your solar panels into the AC electricity used in your home. This could be due to an issue with the inverter itself, the connection to your home’s power grid, or an external factor affecting the AC supply.

Recommended solution/fix steps

To fix this issue, follow these simple steps:

1. Check the AC Connection: Ensure that the inverter is properly connected to your home’s AC power supply. Look for any loose or disconnected cables.
2. Restart the Inverter: Sometimes, simply restarting the inverter can clear the error. Turn off the inverter, wait for a few minutes, and then turn it back on.
3. Inspect for External Issues: Check if there’s any maintenance work on the local power grid or any known issues that might affect the AC supply to your home.
4. Contact Support: If the above steps don’t resolve the issue, it’s best to contact SolarEdge support or a certified technician. They can provide more detailed diagnostics and solutions specific to your model.

Troubleshooting to try

• Check if your inverter is switched on
• Check if your DC isolator is turned on
• Check if all the light indicators are green
• Try rebooting the whole system

How to restart/reset/reboot your SolarEdge solar inverter?

Follow the inverter shut down procedure label which may be located on your inverter or the main switchboard of your house.

Typically, this procedure will be:

1. Turn off the AC “Solar Supply Main Switch” or “Inverter Main Switch” located on the main switchboard of the house.
2. Turn off the AC isolator at the inverter (if present)
3. Turn off the “PV array DC isolator”, located next to the inverter. The screen should go blank, and the lights should go off.  Leave it like this for five minutes or so, and then switch it back on.
4. Wait a few minutes…
5. Turn the inverter back in reverse order (DC isolator first, AC second).
6. DC On first. It is very important that you restart by switching the DC isolator on first, as you shouldn’t switch DC under load (ie with the AC on), as the isolator could arc.
7. AC On next. Put the AC switch (solar supply main switch) back on, and then wait.  All inverters take at least one minute to restart, and you may see the lights flashing while the inverter does internal testing.  There will also be a variety of messages on the screen again as it tests.  This is quite normal.

SolarEdge Maintenance

Regular maintenance ensures a long operating life and optimal efficiency of the entire PV plant. Risk of inverter damage or personal injury due to incorrect service! Always keep in mind that the inverter is powered by dual sources: PV strings and utility grid.

Before any service work, observe the following procedure:

• Disconnect the AC circuit breaker and then set the DC load-break switch if the inverter to OFF;
• Wait at least 10 minutes for inner capacitors to discharge completely;
• Verify that there is no voltage or current before pulling any connector.

Maintenance Items include:

• If the inverter is dirty, clean the enclosure, the enclosure lid, the type label and the LEDs using only clean water and a cloth.
• Ensure that the inverter is free of dust, foliage and other dirt.
• At least once a year, open the fan screen and clean the accumulated dust using a brush.