Do Solar Panels Stop Working After 25 Years?

No. The 25-year mark is when most manufacturer performance warranties expire, not when solar panels stop producing electricity. In practice, panels continue generating power well beyond 25 years — just at a slightly reduced output.

87-88%
Output at year 25
85%
Output at year 30
80%+
Output at year 35+
90%
Panel recyclability by weight

What the 25-Year Warranty Actually Means

Most solar panel warranties guarantee that panels will still produce at least 80-85% of their rated power at year 25. This is a minimum guarantee, not a cliff edge. Real-world data shows that many panels exceed these figures:

  • Average degradation rate: 0.5% per year
  • Expected output at year 25: 87-88% of original
  • Expected output at year 30: 85% of original
  • Expected output at year 35+: 80%+ of original

A 4kWp system producing 3,600 kWh per year when new will still be generating around 3,100 kWh at year 25 and roughly 2,900 kWh at year 30. That is still a meaningful contribution to your energy bills.

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Key Takeaway

Solar panels do not stop at 25 years. A 4kWp system will still generate around 3,100 kWh at year 25 and 2,900 kWh at year 30. That is still meaningful free electricity.

What Might Need Replacing

While the panels themselves keep going, other components have shorter lifespans:

  • Inverter: Expect to replace this once or twice over 25 years. String inverters last 10-15 years; microinverters last 20-25 years
  • Mounting hardware: Stainless steel and aluminium rails last 25+ years, but rubber seals and flashing may need attention
  • DC isolators: These can degrade and should be inspected regularly, especially after 15+ years
  • Cabling: UV-resistant DC cables are rated for 25+ years but should be checked for brittleness in exposed sections
    • Maintenance Tip

    While panels last 25+ years, expect to replace your inverter once or twice. Budget £800-1,500 for a string inverter replacement around the 10-15 year mark.

Recycling Solar Panels

If you do decide to decommission panels after 25-30 years, they should not go to landfill. Solar panels are classified as WEEE (Waste Electrical and Electronic Equipment) in the UK and must be recycled properly.

What can be recovered:

  • Glass (75% of panel weight): Fully recyclable
  • Aluminium frame: Fully recyclable
  • Silicon cells: Can be reprocessed
  • Copper wiring: Fully recyclable
  • Silver contacts: Recoverable

Overall, around 90% of a solar panel by weight can be recycled. The EU WEEE Directive (which the UK has retained) requires manufacturers to fund end-of-life collection and recycling.

Sustainability

Around 90% of a solar panel can be recycled, including glass, aluminium, silicon, copper, and silver. Manufacturers are required by law to fund end-of-life collection and recycling.

Should You Replace Panels at 25 Years?

Only if they are significantly underperforming or physically damaged. If panels are still producing 80%+ of rated output, the economics of replacement rarely stack up:

  • New panels cost money; old panels are already paid for
  • The marginal efficiency gain from new vs 25-year-old panels does not justify the capital outlay for most homeowners
  • Better to invest in battery storage to maximise the value of what your existing panels generate

    • Thinking about solar? Modern panels are built to last 30+ years.

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Frequently Asked Questions

Can solar panels last 40 years?

Yes. Some of the earliest solar installations from the 1980s and 1990s are still producing power today. Modern panels are built with better materials and are expected to last even longer. Output will be lower than when new, but they will still work.

What happens to my feed-in tariff after 25 years?

FIT contracts last 20 years from the date of registration, not 25. After the FIT contract ends, you can still export electricity and receive the Smart Export Guarantee (SEG) rate from your energy supplier. Your panels will continue to save you money through self-consumption.

Is it worth getting solar panels if I might move house?

Solar panels add value to a property. Research by the Energy Saving Trust found that a typical solar installation adds around 4-14% to a home's value. Even if you move before the 25-year mark, you benefit from lower bills while you live there and a higher sale price when you leave.