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System not generating/producing as expected

This guide helps troubleshoot an underperforming Autarco solar PV system. When a system produces less energy than expected, it signifies a problem that needs addressing to maximize energy generation and return on investment.

Possible Causes:

Several factors can contribute to underperformance:

  • Suboptimal Positioning or Installation of Solar Panels: Incorrect tilt angle, orientation, or shading can significantly reduce sunlight capture.
  • Equipment Issues: Problems with the inverter, wiring, or even the solar panels themselves can hinder energy conversion.
  • Environmental Factors: Unexpectedly low solar irradiance due to weather patterns or seasonal changes can temporarily affect output.
  • Monitoring and Data Inaccuracies: Discrepancies in monitoring data or system settings can lead to misinterpretations of system performance.

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:

  1. Check System Monitoring: Verify if your monitoring system is accurately reporting data. If you notice any discrepancies, consult the monitoring system manual or contact the provider for assistance.
  2. Review Installation Parameters: Ensure the solar panels are installed according to the original design specifications. Check for:
    1. Correct Orientation: Panels should ideally face true south in the Northern Hemisphere or true north in the Southern Hemisphere for optimal sunlight exposure throughout the day.
    2. Optimal Tilt Angle: The tilt angle of the panels should be set appropriately for your latitude to maximize solar energy capture.
    3. Minimize Shading: Ensure no objects, such as trees, buildings, or other structures, are casting shadows on the panels, especially during peak sunlight hours. Even partial shading can significantly reduce system output.
  3. Clean Solar Panels: Dust, dirt, leaves, or bird droppings can accumulate on the panels, hindering sunlight absorption. Regularly cleaning the panels can improve their efficiency.
  4. Inspect Wiring and Connections: Carefully examine all wiring connections from the panels to the inverter, ensuring they are secure and free from corrosion or damage. Pay close attention to the following:
    1. Loose Connections: Tighten any loose connections.
    2. Damaged Wires: Replace any damaged or corroded wires.
    3. Proper Crimping: Ensure MC4 connectors are properly crimped to guarantee a reliable connection.
  5. Check Inverter Operation: Observe the inverter display for any error messages or unusual behavior. Refer to the inverter manual for troubleshooting specific error codes.
  6. Analyze Inverter Data: If your inverter allows, review its internal data logs for any performance anomalies or historical trends.
  7. Compare with Expected Yield: Compare the actual energy generation with the expected yield based on the Autarco Helios software. In the system report you will find information about the expected yield based on the digital twin.

Verifying the solution:

After addressing potential issues, continue to monitor your system's performance for several days or even weeks. Look for an increase in energy generation compared to the previous underperforming period. Compare the energy generation in the MyAutarco app to see if it matches the expected output based on your system’s specifications and weather conditions.

If the problem is not resolved:

If the underperformance persists after following all the troubleshooting steps, there might be a more complex issue, such as:
  • A faulty component within the system (inverter, panels, or wiring)
  • A problem with the grid connection
  • Advanced issues requiring specialized equipment and expertise to diagnose

As a system owner: 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.