5 Common Solar Inverter Error Faults & How to Repair Them

Like any piece of equipment, solar inverters can experience faults and errors that can disrupt the operation of the solar system.

Each fault is usually accompanied by an error code displayed on the inverter, which helps in identifying the specific issue.

In this section, we will discuss some of the common error faults that may occur in a solar system inverter in Australia. Understanding the causes of these errors and how to troubleshoot and repair them is important for maintaining the efficiency and effectiveness of your solar system.

What is a Solar Inverter and Why is it Important?

A solar inverter is a critical component of a photovoltaic system, converting the direct current (DC) electricity generated by the solar panels into alternating current (AC) electricity that can be used in homes and businesses. The inverter display shows important information such as error codes and operational status.

Without a solar inverter, the electricity generated by the solar panels would be useless for powering appliances and devices.

Solar Inverter Error Codes

Solar inverter error codes are a crucial part of maintaining and troubleshooting solar energy systems.

These codes are displayed on the inverter to help diagnose and resolve issues, ensuring optimal performance and efficiency. When an error occurs, the inverter will display a specific code that corresponds to a particular fault or issue within the system.

Understanding these error codes can help users identify and address problems early on, preventing extensive system damage and costly repairs. For instance, common error codes might indicate issues such as grid voltage fluctuations, communication failures, or overheating.

By familiarising yourself with these codes and their meanings, you can take prompt action to rectify any issues and maintain the smooth operation of your solar power system.

Inverters from different manufacturers, such as Fronius, Sungrow, Zeversolar, Goodwe, and Growatt, may have unique error codes. Therefore, it’s essential to refer to the specific inverter’s manual or contact a professional technician for accurate diagnosis and repair.

Regularly checking the inverter display for these error codes can help you stay ahead of potential problems and ensure your solar energy system continues to operate efficiently.

Understanding Solar Inverter Faults

Solar inverter error faults can arise from various sources, including issues with the inverter itself, the solar panels, or the grid connection, and can be categorised into different types:

• Temporary faults: Often caused by grid voltage or frequency fluctuations, these faults can usually resolve automatically as the inverter adjusts to the changes.
• Permanent faults: These require manual intervention and can stem from issues with the inverter, solar panels, or grid connection. Addressing these faults promptly is essential to prevent long-term damage.
• Warning faults: These indicate a potential problem that needs monitoring and maintenance to prevent it from escalating into a more serious issue.

Common Solar Inverter Faults in Australia

1. Overcurrent Error

This error occurs when the current flowing through the inverter is too high, and can be caused by a variety of factors such as a short circuit or a faulty solar panel.

2. Undervoltage Error (Grid Voltage)

This error occurs when the DC input voltage supplied to the inverter is too low, and can be caused by issues such as a weak battery or a faulty panel.

3. Islanding Error

This error occurs when the inverter continues to operate even though it is not connected to the grid, which can be hazardous.

4. Overheating Error

This error occurs when the inverter’s internal temperature becomes too high, which can be caused by a variety of factors such as a faulty fan or a blocked ventilation system.

5. Faulty Communication Error

This error occurs when the inverter is unable to communicate with the solar panels or the grid, which can be caused by a variety of factors such as a faulty communication cable or a damaged inverter.

Common Causes of Solar Inverter Failure

Solar inverter failure can be caused by various factors, and understanding these can help in preventing issues and maintaining the efficiency of your solar power system.

Common causes include:

• Overheating: High temperatures can cause the inverter to malfunction or fail.
• Power surges: Sudden increases in power can damage the inverter’s electrical components.
• Grid voltage fluctuations: Changes in grid voltage can cause the inverter to malfunction or fail.
• Poor installation: Incorrect installation can lead to electrical issues and inverter failure.
• Lack of maintenance: Failure to perform regular maintenance can lead to inverter failure.

Troubleshooting and Repairing Solar Inverter Faults

To troubleshoot a solar inverter fault, it is important to first identify the cause of the issue.

This can be done by checking the inverter’s display panel for any error codes or messages, as well as by performing a visual inspection of the inverter and its components.

Checking grid connections and grid frequency is crucial for identifying issues related to grid stability and operational safety.

Tips for repairing common solar inverter faults

Once the cause of the fault has been identified, there are a few steps you can take to repair the issue:

• For overcurrent errors, check the solar panels for any visible damage or debris that may be causing a short circuit. If the panels are clear, you will need an inverter repair technician to check the inverter’s DC input connectors for loose or damaged wires.
• For undervoltage errors, an inverter repairer will need to check the condition of the battery and replace it if necessary. If the battery is in good condition, they check the panel’s connections to ensure that they are secure and not damaged.
• For islanding errors, a solar repair expert will check the inverter’s connections to the grid to ensure that they are secure and not damaged. They may also need to check the inverter’s settings to ensure that it is properly configured to detect islanding.
• For overheating errors, check the inverter’s ventilation system to ensure that it is clear of any debris or obstructions. If the ventilation system is clear, a solar repairer will need to be called to check the inverter’s internal components for any signs of damage or malfunction.
• For faulty communication errors, if you’re experiencing this error, have a solar repair technician check the communication cables for any visible damage or loose connections. If the cables are in good condition, they will check the inverter’s internal components for any signs of damage or malfunction.
• For issues related to maximum power point tracking, a technician should check for mismatched system configurations and component failures, as these can lead to reduced energy efficiency and production.

When to seek professional assistance for solar inverter repairs

If you are unsure of how to troubleshoot or repair a solar inverter fault, it is recommended to seek the assistance of a professional.

Solar inverters contain complex electronic components, and attempting to repair them without the proper knowledge and expertise can be dangerous and may cause further damage.

Preventing Inverter Failure

Preventing inverter failure requires regular maintenance and monitoring.

Here are some tips to help prevent inverter failure and ensure the optimal performance and efficiency of your solar energy system:

• Regularly inspect the inverter: Conduct routine inspections of the inverter for any signs of wear or damage. Look for any physical damage, loose connections, or signs of overheating.
• Check the inverter display: Regularly check the inverter display for error codes or messages. Promptly addressing any error codes can prevent minor issues from escalating into major problems.
• Monitor the solar panel array: Keep an eye on the solar panel array for any issues, such as dirty panels or faulty wiring. Clean the panels regularly to ensure they are free from dirt and debris, which can obstruct sunlight and reduce efficiency.
• Perform routine maintenance: Carry out routine maintenance tasks, such as cleaning the inverter and checking the grid connection. Ensure that the ventilation system is clear of obstructions to prevent overheating.
• Update the inverter software: Regularly update the inverter software to benefit from the latest features, bug fixes, and performance improvements. Software updates can enhance the inverter’s efficiency and reliability.

Regular maintenance and monitoring are key to extending the lifespan of your inverter and maximising the benefits of your solar power system.

How To Determine What Type of Solar Inverters You Have

There are several types of solar inverters available, each designed for different solar energy system configurations:

1. Grid-Tied Inverters

• Common in solar PV systems connected to the utility grid.
• Ensures that any excess power output is fed back into the grid.
• Requires a stable grid connection to function properly.
• Examples: Fronius solar inverter, Growatt solar inverter, Goodwe solar inverter.

2. Off-Grid Inverters

• Used in solar energy systems not connected to the utility grid.
• Typically used with battery storage to provide continuous power output.
• Works with PV modules connected in standalone setups.

3. Hybrid Inverters

• Combines both grid-tied and off-grid capabilities.
• Can store excess solar energy in batteries while still being connected to the grid.
• Supports Maximum Power Point Tracking (MPPT) to enhance efficiency.

Contacting the Solarfix Solar Repair Experts

If you are experiencing any of the error faults discussed in this article, it is important to take action to address the issue as soon as possible to ensure the continued operation and efficiency of your solar system.

If you are unsure of how to troubleshoot or repair the error, it is recommended to contact Solarfix‘s solar repair experts on 0497 524 407. Our team of experienced solar technicians have the knowledge and expertise to identify the cause of the error and provide a solution to get your solar system back up and running smoothly.

Don’t let a faulty solar inverter disrupt your access to clean and reliable energy. Contact our Solar Repair Experts today and let us help you get your solar system back on track.