How Long Should Solar Panels Last?
If you’re a homeowner with a solar system—or thinking about getting one—one of the most common questions is: How long do solar panels really last?
The short answer? Modern solar panels can last up to 50 years, with excellent energy production for decades. But there’s more to it than just a number.
1. Most Panels Are Designed for 25–30 Years (At Least)
The majority of solar panel warranties guarantee performance for 25 years, but this doesn’t mean they stop working afterward. It simply means manufacturers ensure they’ll still produce around 80–85% of their original power after that period.
➡ Related: 10 Reasons to Keep Your Solar Panels After a Roof Replacement
2. Real-World Lifespan Can Reach 40–50 Years
New research and case studies show that many panels—especially high-quality models—continue performing well beyond 30 years.
Modern glass-glass panels, for example, have no backsheet that deteriorates over time and are projected to last up to 50 years with minimal degradation.
➡ External source: How Long Do Solar Panels Last – This Old House
3. What Is Degradation Rate?
Solar panels lose a small amount of efficiency every year, known as the degradation rate.
Most quality panels degrade at 0.3% to 0.5% annually — meaning even after 25 years, you could still get 88% or more of your system’s original performance.
4. Inverters and Other Equipment Have Shorter Lifespans
While the panels themselves may last 30–50 years, inverters and batteries typically last:
- String inverters: 10–15 years
- Microinverters: 20–25 years
- Batteries: 10–15 years (depending on use)
That’s why it’s important to plan for occasional component replacements—but your core panel system remains strong for decades.
➡ Related: What Happens During Solar Panel Reinstallation?
5. Factors That Impact Longevity
Panel quality: Tier 1 manufacturers offer better long-term performance
Installation: Proper mounting and wiring reduce risk of damage
Weather: Extreme heat, snow, and storms may accelerate wear
Maintenance: Regular cleaning and inspections can extend your system’s life
6. Warranties You Should Know About
Product warranty: Covers manufacturing defects (typically 10–25 years)
Performance warranty: Guarantees output over time (usually 25 years)
Workmanship warranty: Covers labor or installation from your contractor (varies by company)
Make sure your installer provides all three—and that your system is reinstalled properly after roofing projects.
➡ Learn more: Solar Panel Removal and Reinstallation Services
7. What Happens After 25 or 30 Years?
Your system won’t just “die.” It will still generate power—just at slightly lower efficiency.
Many homeowners continue using their systems for 35+ years, especially if the panels are cleaned regularly and electrical components are maintained.
Final Thought: Solar Panels Are Built to Last
If you invested in solar, you made a smart long-term decision. With high-quality equipment, good installation, and proper maintenance, you can expect reliable solar performance for three to five decades.
Need Your Solar System Inspected or Reset After Roof Work?
We specialize in solar panel detach and reset services across Florida. Our licensed team protects your warranty, improves performance, and keeps your system running strong.
External Sources for Further Reading:
This Old House – How Long Do Solar Panels Last?
NREL – Extending the Lifetime of Solar Modules
Energy.gov – Solar Futures Study PDF
✅ Solar Panel Maintenance Checklist
Want your solar panels to last 30–50 years? Here’s what to do:
Monthly Visual Check (From the Ground)
- Look for debris buildup (leaves, branches, dust)
- Check for visible damage or shifting after storms
- Monitor for animal nesting near wiring or roof penetrations
Quarterly Cleaning (If Needed)
- Clean panels with soft water and a non-abrasive cloth or sponge
- Use mild soap if there’s bird droppings or sticky residue
- Never use pressure washers or abrasive cleaners
➡ Related: Solar Panel Cleaning Services
Every 6–12 Months
- Review system production data (watch for drops)
- Inspect cables, junction boxes, and conduit for wear
- Check inverter display or monitoring app for errors
- Schedule a professional inspection if anything looks off
➡ Need help? Book a solar inspection with our licensed team.
Every 5–10 Years
- Replace or service inverters as needed
- Recalibrate or upgrade monitoring systems
- Replace damaged racking or hardware from roof work
🛡 Pro Tip:
Always hire a licensed professional for anything electrical or structural. This protects your warranty and ensures system performance stays optimal.
Click “here” to get an estimate for your solar panel removal.
