What Happens to Solar Panels After 25 Years? California Guide

The 25-year solar panel warranty doesn't mean your panels die at 25 years. It means the manufacturer guarantees at least a certain output level at that 25-year mark; the percentage is on your panel's warranty sheet. Panels keep producing electricity for decades past warranty expiration — just at slightly reduced output. Here's what actually happens to California solar systems over time, and what homeowners do when warranties expire.

This page is one part of our solar maintenance and repair guide.

How Solar Panels Degrade

Solar panels lose output gradually over time — a process called degradation. Industry benchmarks:

• •Year 1-2: ~2-3% initial degradation as the panels settle
• •Years 2-25: Linear degradation of 0.25-0.55% per year
• •At year 25: Typical output 80-87% of original rating
• •Year 30-40: Output typically 70-80% of original — still very usable

Premium panels (Qcells, REC, Silfab, Panasonic) often guarantee higher year-25 output than baseline tier-1 panels (Jinko, Trina, Longi, Canadian Solar). When comparing panel brands, the "year-25 power warranty" is what matters more than the "product defect warranty."

What Else Happens Over 25 Years?

Inverters don't last as long as panels. String inverters usually carry shorter warranties than panels and often need replacement once during a system's life; get a written price for the replacement. Microinverters (Enphase) have 25-year warranties and generally last the full panel life. Tesla Solar Inverters are warranted 12.5-25 years depending on model.

Batteries need replacement. Home batteries (Tesla Powerwall, Enphase IQ, FranklinWH) typically warranty 10-15 years. Beyond that, they degrade more meaningfully than panels and are often replaced. Figure $8,000-$15,000 for a battery replacement in year 15+.

Panels rarely need replacement. Most California homeowners keep their original panels past year 25 because the production is still meaningful and replacement cost outweighs the incremental benefit.

The Department of Energy cites a Berkeley Lab survey of U.S. solar professionals: the average operational lifespan of a solar panel rose from about 20 years in 2007 to 25 to 35 years in 2025 (U.S. Department of Energy, End-of-Life Management for Solar Photovoltaics, checked September 24, 2026).

Your Options at Year 25+

Option 1: Keep the system, accept reduced output. The simplest and most common path. Panels keep producing at 80-87% and your bill savings persist, if slightly reduced. If the inverter or battery fails, replace just that component.

Option 2: Repower — replace panels only. If new panel technology is dramatically better (which it might be in 25 years), swapping panels while keeping the racking and electrical infrastructure can be cost-effective. Typically $10,000-$20,000.

Option 3: Full system replacement. Start over with new panels, new inverter, new battery, new system design optimized for whatever tariff and technology exists at that time. Expensive but delivers another 25+ years.

What About Solar Panel Recycling?

End-of-life panels that test as hazardous waste can be managed in California as universal waste, a lighter set of hazardous-waste rules: Health and Safety Code §25259 (SB 489, 2015) lets the Department of Toxic Substances Control designate them that way (California Legislative Information, checked September 24, 2026). Most homeowners deal with this only at a full replacement, when the installer handles disposal.

Before a removal, ask the installer or recycler in writing where the panels will go and how they will be handled. Recycling capacity is still growing as older residential systems reach the end of their working life.

What if My Installer Goes Out of Business Before Year 25?

This is a real risk in California given recent installer bankruptcies (Freedom Forever, Chapter 11 in April 2026, converted to Chapter 7 liquidation on August 7, 2026; Sunnova in June 2025; SunPower in August 2024). When an installer closes, the workmanship warranty typically becomes unrecoverable — but the manufacturer warranties on panels, inverters, and batteries remain intact because they're between you and the equipment maker, not the installer.

Practical move: keep detailed records of your system — manufacturers, serial numbers, installation date. If your installer vanishes, you can still file warranty claims directly with Enphase, Tesla, Qcells, or whoever made the equipment. See the Sunnova review and Freedom Forever review for practical details on bankruptcy fallout.

Frequently Asked Questions

Do solar panels stop working after 25 years?

No. They keep producing electricity — typically 80-87% of original output at year 25, 70-80% at year 30-40. The "25-year" number is a warranty threshold, not a death date.

How long do solar panels actually last?

30-40 years of useful production is typical. Some panels from the 1980s are still operating at measurably reduced output today. Catastrophic failure from hail, fire, or mechanical damage is the usual reason a panel stops working entirely.

Can I replace old panels on an existing racking system?

Yes — this is called "repowering." If your racking, wiring, and mounting are sound, swapping just the panels is cheaper than a full system redesign. Check with an installer for compatibility (newer panels may have different dimensions or electrical characteristics).

What happens to my warranty if the installer goes out of business?

Workmanship warranty is typically lost. Manufacturer warranties on panels, inverters, and batteries remain — those are between you and the equipment manufacturer. Keep all paperwork and serial numbers.