Sungrow Error Code 4

Sungrow Inverter Error Code 4

Is your Sungrow Solar Inverter showing up with Error Code 4 on the screen? When a problem occurs, the “Error” state will be shown on the main screen.

Your Sungrow Solar Inverter is displaying Error Code 4 because the electricity voltage coming from your power grid (the main electricity supply system) is too low, lower than what your inverter is designed to handle safely. This means the inverter can’t operate properly because it’s not getting enough power from the grid.

To fix this issue, you can follow these steps:

1. Check your home’s main electrical panel: Make sure that all the circuit breakers are in the ‘ON’ position, especially the one connected to your solar inverter.
2. Inspect the power supply: Sometimes, the problem could be with the local grid itself. If possible, check if your neighbors are experiencing similar issues. If they are, the problem might be with the local grid, not your system.
3. Reset your inverter: Sometimes, simply turning your inverter off and then back on again after a few minutes can resolve the issue. This is like restarting your computer when it’s not working right.
4. Contact your utility company: If you suspect the problem is due to the grid’s voltage being too low and it’s not something you can fix, you might need to call your electricity provider for help.
5. Get professional help: If none of the above steps work, it’s best to contact a certified electrician or the company that installed your solar system to inspect and fix the problem.

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 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.

Sungrow 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:

• System Clean (Once six to twelve months) – Check the temperature and dust of the inverter. Clean the inverter enclosure if necessary. Check if the air inlet and outlet are normal. Clean the air inlet and outlet, if necessary.