All solar panels slowly lose efficiency over their lifespan, but the rate is usually minimal.

Key Points

  • Average Lifespan: Most panels last 25–30 years, often longer.
  • Degradation Rate: Typical panels lose about 0.5%–0.8% efficiency per year.
  • Warranty Coverage: Most manufacturers offer 25-year performance warranties, ensuring panels produce at least 80–85% of their original output.

Takeaway

Even after decades, solar panels continue generating electricity reliably. Understanding degradation helps homeowners plan energy production and long-term savings.