# How long do commercial solar panels last?

Commercial solar panels typically last 25 to 30 years or more, with output declining only gradually — usually well under 1% a year. That means a system installed today is still producing the large majority of its original output decades later, long after a PPA term ends.

## What degradation means

Panels lose a small fraction of their output each year, a process called degradation. Quality modern panels degrade slowly — often guaranteed to still produce around 85–90% of their original output after 25 years.

## Inverters and batteries

Panels outlast most other components. Inverters may be replaced once during the system’s life, and batteries have their own lifespan. Under a PPA the provider handles any replacements as part of maintaining performance.

## Value beyond the PPA term

Because a PPA typically runs around 20 years and panels last longer, the system usually transfers to you with years of productive life left — giving you free, self-generated power after the term.

## Frequently asked questions

**Will the panels still work after the PPA ends?**

Yes — panels commonly last 25–30 years or more, so a system handed over at the end of a ~20-year PPA still has years of productive life, generating power you then keep for nothing.

**Do panels suddenly stop working?**

No. They degrade gradually rather than failing outright, so output tapers slowly over decades. Monitoring and maintenance keep them performing throughout.

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Source: [How long do commercial solar panels last?](https://ppafunding.com/guides/how-long-do-commercial-solar-panels-last) · Author: PPA Funding team · Updated: 2026-07-30

PPA Funding is an independent introducer operated by DVC Group Ltd (Companies House 10462808), Shrewsbury — not the funder, the installer or the maintenance provider. The service is free to use; a commission may be earned from a partner at no extra cost. Content is educational and is not financial or tax advice.