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Troubleshooting solar panel performance issues — what should I check?

April 5, 2026

Quick Answer

When troubleshooting solar panel performance issues, check the panel's cleanliness, ensure proper connections to the inverter and wiring, and inspect the panel's surface for any damage or degradation.

Panel Cleaning

Before troubleshooting, ensure the solar panels are clean. Dirt and grime can reduce panel efficiency by up to 25%. Use a soft-bristled brush or a garden hose with a spray nozzle to gently clean the panels. Avoid using high-pressure washes or abrasive materials that can damage the panels’ surface.

Electrical Connections and Wiring

Check the connections between the solar panels, inverter, and wiring for any signs of wear or damage. Ensure all connections are secure and not loose, as loose connections can cause voltage drops and reduced panel performance. Measure the voltage and current at the inverter to ensure it matches the expected output of the solar panels.

Panel Inspection

Inspect the solar panels for any signs of physical damage, such as cracks, dents, or broken glass. Check the solar cells for any signs of degradation, such as discoloration or corrosion. Use a multimeter to measure the voltage and current output of individual panels to identify any performance issues.

Inverter Settings

Check the inverter settings to ensure they are configured correctly. Adjust the settings as needed to optimize the inverter’s performance and ensure it is working within its specified operating range. Consult the inverter’s user manual for specific instructions on configuring the settings.

Monitoring System

If the issue persists, use the monitoring system to gather more data on the solar panel performance. Check the monitoring system’s logs for any error messages or alerts that may indicate the cause of the issue. Use the data to identify any trends or patterns in the panel’s performance that may help troubleshoot the issue.

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