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SESK: Stuff Everyone Should Know · sesk.info/solar-product-vs-performance-warranty

What does a solar panel's performance warranty guarantee?

A power output that declines slowly over the years.

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  1. Free replacement of any defective part
  2. A power output that declines slowly over the years ✔
  3. Free roof repairs if panels cause leaks

Why: Product warranties cover defects in materials and workmanship. A performance warranty guarantees a power output that declines over time, often ending near 80% of the original rating after 25 years.

Huh, didn't know that: NREL notes PV modules carry performance warranties of 20 or 25 years, which very few kinds of electrical equipment offer.

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What would the sun say if he had a wife? You are my sol-mate.
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References

Answer: A power output that declines slowly over the years. Product warranties cover defects in materials and workmanship. A performance warranty guarantees a power output that declines over time, often ending near 80% of the original rating after 25 years.

  1. NREL: Best Practices for Operation and Maintenance of Photovoltaic and Energy Storage Systems (3rd ed.) docs.nlr.gov/docs/fy19osti/73822.pdf
    The performance warranty guarantees a certain power output that declines over time
    Checked 2026-10-10.

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