Path-Q Solar

How much solar panel degradation should I expect over its operating life?

Answer

Solar panels generally lose some power-generating capacity gradually over time, with the rate depending on technology, manufacturing quality, climate, installation, and operating conditions. Use the specific product's warranty or datasheet degradation terms rather than applying one universal percentage.

Key points

  • Degradation reduces expected output relative to the panel's initial performance; it is not the same as a sudden equipment failure.
  • Heat, humidity, cycling, mechanical stress, and other environmental conditions can influence the rate.
  • Warranty thresholds are product-specific and may distinguish an initial loss from later annual decline.

What it depends on

  • Panel technology and product specifications
  • Climate, mounting, temperature, humidity, and maintenance
  • Baseline measurement and data quality

Risks and trade-offs

  • A system can appear to degrade because of soiling, shading, inverter losses, or monitoring errors.
  • A warranty limit is not necessarily a forecast of actual performance.

Information you may need

  • Panel model and warranty
  • Commissioning or early-life production baseline
  • Long-term monitoring and site-condition records

Your next step

What to do next

Record a reliable baseline and compare normalized annual output with the panel's product-specific degradation terms.

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SQ01797