How Long Do Solar Panels Last?

Solar panels typically last 25 to 30 years or more, and they don’t stop working when they hit that mark — they simply produce a little less each year. Quality modern panels degrade at roughly 0.5% per year, so after 25 years a panel still generates around 85% to 90% of its original output. That slow, predictable decline is why most manufacturers back their panels with 25-year performance warranties, and why a well-installed system often keeps producing usefully into its fourth decade.

Panel output over time

Here’s what typical degradation looks like for a panel that starts at 100% output:

Years in service	Approximate output remaining
Year 1	97% – 98% (small initial drop)
Year 5	~96%
Year 10	~94%
Year 15	~92%
Year 25	85% – 90%
Year 30+	80% – 87%

The exact numbers depend on the panel’s quality tier and your climate, but the shape is always the same: a slightly larger drop in year one, then a gentle, steady decline. Premium panels often guarantee a lower degradation rate — around 0.25% to 0.4% per year — and hold more output at year 25.

What “lifespan” really means for solar

Solar panels rarely “die.” Their lifespan is defined by gradual output loss, not a sudden failure. A 25-year performance warranty typically guarantees the panel will still produce at least a stated percentage (often 85% to 92%) of its rated output at year 25. When people ask how long panels last, the practical answer is: as long as they keep producing enough electricity to be worth having on your roof, which for most systems is well beyond the warranty period.

The component more likely to need attention isn’t the panel — it’s the inverter, which usually lasts 10 to 15 years for a string model. Planning for one inverter replacement is normal; planning to replace panels usually isn’t. Our solar panel maintenance cost guide covers those service costs.

What shortens panel life

Heat. Panels run less efficiently and age faster in very hot conditions. Good installations leave an air gap under the panels for cooling.

Poor installation. Loose racking, water intrusion at connections, and improper wiring cause far more early failures than the panels themselves. Installer quality matters more than brand for longevity.

Physical stress. Hail, falling branches, heavy snow loads, and high winds can crack glass or cells. Most panels are rated to withstand substantial hail and wind, but extreme events cause damage.

Micro-cracks and hot spots. Manufacturing defects or shading-induced hot spots can accelerate localized degradation. Monitoring helps catch these early.

Salt and pollution. Coastal salt air and industrial pollution can corrode frames and connections over time; corrosion-resistant hardware helps.

How to make panels last longer

• Choose a quality installer. Sound mounting and weatherproofing prevent most premature failures.
• Keep an eye on monitoring. Early detection of an underperforming panel or string prevents small problems from spreading.
• Trim shading trees. Partial shading creates hot spots and stresses cells.
• Clear heavy snow and debris gently when it accumulates, without walking on panels.
• Register your warranty and keep records so a covered failure costs you nothing.

Incentives in 2026 don’t affect longevity — but do affect replacement math

A panel’s lifespan is a physics-and-engineering question, unchanged by tax policy. What did change in 2026 is the cost of replacing or expanding a system. The 30% federal residential clean energy credit was repealed for purchases installed after December 31, 2025, so if an aging system eventually needs new panels or you decide to expand, there’s no federal tax credit for buyers in 2026 to offset that purchase. Some states still offer incentives. Because replacement is now more expensive out of pocket, protecting the panels you have — through good maintenance and warranty registration — matters more than ever. See our 2026 solar tax credit guide.

When should you replace panels?

For most homeowners, the answer is: not for a very long time, if ever, during their ownership. Consider replacement or an upgrade when output has fallen far enough to matter for your bills, when a large share of panels have failed outside warranty, or when a roof replacement forces the array to come down anyway (a good moment to reassess). Because panels degrade so slowly, “worn out” is rarely the trigger — a roof project or a desire for more capacity usually is. If you’re weighing whether solar still pencils out, our is solar worth it in 2026 guide walks through the math.

FAQ

How long do solar panels last? Typically 25 to 30 years or more. They don’t stop working at 25 — they just produce modestly less each year, usually still 85% to 90% of original output at year 25.

What is solar panel degradation? The slow annual decline in output, averaging about 0.5% per year for quality panels. Premium panels degrade more slowly, around 0.25% to 0.4% per year.

Do solar panels stop working after 25 years? No. The 25-year mark is a warranty milestone, not an expiration date. Most panels keep producing useful power well beyond it, just at a somewhat reduced level.

What fails first, the panels or the inverter? The inverter. A string inverter typically lasts 10 to 15 years, while panels commonly last 25 to 30+. Budget for one inverter replacement over the system’s life.

Does the 2026 tax credit change affect panel lifespan? No. Lifespan is unaffected by tax policy. But the repeal of the federal buyer credit makes replacing or expanding a system more expensive in 2026, so maintaining what you have matters more.

What shortens a solar panel’s life the most? Poor installation is the biggest avoidable factor. Excess heat, physical damage from hail or debris, and corrosion in harsh environments also contribute. Quality installation and monitoring extend life.

Estimate your system’s long-term value

A 25-to-30-year lifespan is what makes solar’s economics work — decades of savings after the payback period. Use our free solar calculator to model production and savings over the full life of a system, and pair it with our solar payback period guide to see when a system turns the corner into pure savings.