Do panels stop at 25 years?

No — they keep working at 80-87% capacity. The 25-year warranty is a guarantee, not a death sentence. Most panels continue for 30+ years.

What actually wears out?

The inverter (10-15 years, one replacement). The panels and mounting last the full 25-30+ years with near-zero maintenance.

How Long Do UK Solar Panels Last?

By Home Solar Guide Team|Updated 18 March 2026|question

Independently written | Evidence-based | Sources cited

Solar panel longevity — 25-30+ years of electricity generation. The best financial years come AFTER payback.

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How long do solar panels last?

UK solar panels last 25-30+ years. Key longevity facts: Panel degradation: 0.3-0.5% per year. After 25 years: 80-87% of original output. After 30 years: 75-82%. Warranty: 25 years product + 25 years performance is standard. Inverter: lasts 10-15 years (one replacement needed, £800-£1,500). Mounting system: lasts 25+ years (no replacement). No moving parts = minimal mechanical wear. The 25-year mark is the warranty expiry, NOT the end of life. Many panels continue producing useful electricity into their 30s and 40s.