OV-G-V: Grid over voltage

The inverter is reporting that the utility grid's voltage is higher than the allowed limits. This can trigger the inverter to shut down to prevent damage.

Possible causes

High AC Cable Resistance: The AC cable connecting the inverter to the grid might have high resistance due to its size, length, or poor connections. A high resistance cable can cause a voltage drop, which can lead to an overvoltage condition at the inverter.
Incorrect Grid Standard Setting: The inverter might be configured with the wrong grid voltage standard. If the standard is set too low, the inverter will interpret the normal grid voltage as overvoltage.
Utility Grid Fluctuations: The utility grid might be experiencing voltage surges or fluctuations that are exceeding the acceptable range for the inverter.

Before you begin

Safety First: Working with electrical equipment always involves risks. Ensure you are qualified and follow appropriate safety precautions. Disconnect the inverter from both AC and DC sources before performing any physical inspection or adjustments.

Gather Information: Before starting troubleshooting, have the inverter manual on hand. You should also gather information about the inverter model and serial number, the installation date, and the PV array configuration (number of panels, capacity, and number of strings).

Troubleshooting Steps

Wait for Grid Voltage to Stabilize: The grid voltage might return to normal on its own. Observe the situation for a short period to see if the voltage returns within limits.
Measure Grid Voltage: Measure the voltage at the inverter's AC output terminals using a multimeter set to AC voltage.
Compare with Standard: Check your inverter manual to find the acceptable voltage range for your region's grid standard. See if the measured voltage falls within this range.
Inspect AC Cable and Connections: Examine the AC cable for any visible damage, loose connections, or signs of corrosion. A damaged or corroded cable can increase resistance and contribute to overvoltage.
Verify Grid Standard Settings: Access the inverter's Advanced Settings menu and verify that the grid standard setting matches your location.
Change AC Cable Size: If the AC cable is long or has high resistance, replace it with a larger size cable to reduce voltage drop. This will help ensure that the voltage at the inverter's terminals stays within the acceptable range.
Contact Your Utility Company: If the grid voltage remains high after checking the settings and connections, contact your utility company to report the issue. They can investigate possible problems with the grid voltage in your area.

Validating the solution

After performing the troubleshooting steps, monitor the inverter. The "OV-G-V" error should clear, and the inverter should function correctly.

If the problem is not resolved

If the “OV-G-V” error continues after completing all the steps, there might be an internal fault within the inverter.

As a system owner: In this case, contact the inverter installer or distributor for further assistance. You can find the details of your installer in the MyAutarco app.
As a certified installer: Contact Autarco Support, you can submit a support case via Helios.