How Long Do Solar Panels Last? Lifespan, Degradation & Maintenance in 2026

Solar panels last longer than most people think — and they fail more gracefully. They don't just stop one day; they slowly produce a little less each year. Here's what to actually expect in 2026, and what maintenance (if any) you'll do.

Lifespan: 25–30+ years

Most quality panels are warrantied for 25 years and keep producing well beyond that, just at reduced output. The inverter (the box that converts the power) is the part most likely to need replacing once in the system's life — typically around years 10–15 for a string inverter; microinverters often carry 25-year warranties.

Degradation: the number that matters

Panels lose a little output per year — modern ones degrade roughly 0.4–0.5% per year. After 25 years, a good panel still produces around 85–90% of its original output. That's what a "performance warranty" guarantees. A higher degradation rate is a quiet red flag on cheaper panels — worth checking when you read the quote.

Maintenance: refreshingly little

• Cleaning — in most climates rain does the job; heavy dust, pollen, or bird droppings can warrant an occasional rinse.
• Monitoring — your system app shows production; a sudden drop is your early warning.
• Inverter — the one component to budget a possible mid-life replacement for.
• Roof — make sure your roof has the life to match the panels before installing (see solar and your roof).

Why this matters for the math

A 25–30 year productive life is what makes solar's payback so favorable: after the system pays for itself (payback by state), you get a decade or more of nearly free power. Get a free quote and we'll model the full lifetime, degradation included.