OV-G-I: Grid over current

The "Grid Over Current" error indicates that the inverter is detecting an excessive current flowing from the inverter to the utility grid. This could be due to a fault within the inverter, an issue with the grid connection, or an external factor affecting the grid.

Why it's problematic

The overcurrent condition can trigger the inverter to shut down to protect itself and the grid from potential damage.
It disrupts the solar energy production and the flow of electricity to the grid, affecting system efficiency.

Possible causes

High Grid Impedance: The resistance in the AC wiring or connection to the grid is too high, causing a voltage drop and resulting in higher current.
Grid Voltage Fluctuations: Unstable or fluctuating grid voltage can lead to overcurrent conditions.
Internal Inverter Fault: A malfunction within the inverter itself can cause it to output excessive current.

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

Check Grid Connection: Inspect the AC wiring and connections between the inverter and the utility grid for any signs of damage, loose connections, or corrosion.
Measure Grid Voltage: Use a multimeter to measure the grid voltage at the point of connection to the inverter. Ensure it is within the acceptable range specified in the inverter's manual.
Check for Grid Events: Contact the utility company to inquire about any recent grid disturbances or fluctuations that may have occurred.
Restart Inverter: Power cycle the inverter by turning it off and then back on. This can sometimes clear temporary faults or communication errors.
Reduce Solar Input (If Possible): If the inverter has multiple strings, try disconnecting one string at a time to see if the overcurrent condition clears. This can help isolate the problem.
Check Inverter Settings: on the inverter LCD under "Advanced Settings" or under Helios Digital O&M adjust the frequency settings if the it is too low.

Verifying the solution

After addressing the potential causes, observe the inverter's operation. The "Grid Over Current" error should clear if the problem is resolved. The inverter should resume normal operation and begin feeding power to the grid without any overcurrent issues.

If the problem is not resoled

If the error persists after following all the above steps, there might be an internal fault within the inverter or an issue with the electrical wiring.

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.