OV-ILLC: LLC hardware overcurrent

The "OV-ILLC" error suggests a problem with the inverter's LLC resonant circuit, which is responsible for converting the DC voltage from the solar panels into high-frequency AC before it's transformed into grid-compatible AC power. An overcurrent condition in this circuit indicates that the current flowing through it exceeds the safe operating limit.

Why it's problematic

An overcurrent situation in the LLC circuit can damage sensitive components, leading to inverter malfunction and power generation interruption.
Continued operation under overcurrent conditions can pose a fire hazard.

Possible causes

Short circuit in the DC input: A short circuit in the wiring connecting the solar panels to the inverter can cause a surge in current, triggering the LLC overcurrent protection.
Component failure within the LLC circuit: A malfunctioning capacitor, inductor, or transistor within the LLC circuit can disrupt its operation and lead to an overcurrent condition.
Internal inverter fault: Other internal faults within the inverter, affecting voltage regulation or control signals, can indirectly cause overcurrents in the LLC circuit.

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

Restart the inverter: A restart can sometimes resolve temporary issues. Power off the inverter completely, wait for a minute, and then power it back on.
Check DC wiring and connections: Carefully examine the wiring between the solar panels and the inverter for any signs of damage, loose connections, or corrosion. Tighten connections as needed.

Verifying the solution

Observe the inverter's display after the restart and inspection. If the "LLC hardware overcurrent" error has disappeared, the inverter may resume normal operation. Look for stable status LED indications and power generation readings.

If the problem is not resolved

If the error persists, it's highly likely that there is an internal fault within the inverter that requires professional attention.

As a system owner: Contact the installer or distributor for assistance. You can find installer details in the MyAutarco app.
As a certified installer: Reach out to Autarco Support by submitting a case via Helios.

Important Note: The information provided in this guide is for general troubleshooting purposes only. Always consult the specific user manual for your inverter model and adhere to safety guidelines provided by the manufacturer. Do not attempt repairs or internal inspections unless you are a qualified and certified technician.