How long do solar panels last? Longer than your mortgage.

Last updated: 15 July 2026 · Written by the ECONEXIS team, MCS-accredited installers.

The short answer: 25–30 years or more for the panels themselves, and they don't stop dead at the end — they just fade slowly. But a solar system isn't only panels, and the honest lifespan conversation covers the inverter and battery too. Here's how it really breaks down.

Panels: slow fade, not sudden death

Solar panels have no moving parts; what ages them is weather and sunlight itself. Modern tier-1 panels degrade at a fraction of a percent per year, and manufacturers put that in writing: the panels we fit are typicallywarranted to still produce roughly 87–90% of their original output at year 25. In practice, panels from the 1990s are still quietly working today — a well-made panel's 30th birthday is unremarkable.

The inverter: the part that retires first

The inverter works hard every daylight hour, and it's electronics — realistic service life is 10–15 years, with warranties typically around 10. Budget for one inverter replacement over the system's life; it's a straightforward swap, not a re-install. This is also why we're picky about inverter brands — a cheap one is where a cheap quote hides.

Batteries: measured in cycles, warranted in years

Modern home batteries use LFP chemistry — the long-life, stable one — and carry 10-year warranties as standard. A battery cycles roughly once a day, and LFP packs are built for thousands of cycles, so a decade of daily work is what they're designed around. OurFox ESS EP12 review digs into what those warranty terms actually promise.

What the paperwork should say

• Panel product warranty — 25 years on the tier-1 panels we fit (the physical panel, not just its output).
• Panel performance warranty — the guaranteed output curve, ~87–90% at year 25.
• Inverter warranty — typically 10 years.
• Battery warranty — typically 10 years.
• Workmanship — our installs are backed by an insurance-backed guarantee through the IWA, so the promise survives even if an installer doesn't.

How to make 30 years actually happen

Almost nothing — that's the point. No servicing schedule, no consumables. Rain does the cleaning on pitched roofs, and a once-in-a-while visual check plus keeping an eye on the app covers the rest. Ourmaintenance guide covers the few things worth doing.

The panels will outlast the paperwork, most cars and possibly your boiler's replacement's replacement. What matters is buying quality once — get afree custom design with the exact panel, inverter and warranty spec written down, usually back within 24 hours, anywhere across Bedfordshire, Hertfordshire, Buckinghamshire, Essex & Kent.

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