How Long Do Solar Panels Last? Maintenance & Warranty Guide
When investing in solar panels, homeowners often ask: “How long do they last?” The good news is that modern solar technology is incredibly durable. With proper care, a solar system can serve you efficiently for 25+ years. Here’s what you need to know about the average lifespan, maintenance tips, and warranty coverage for solar panels.
Average Lifespan of Solar Panels
Most residential solar panels are designed to last 25 to 30 years or more. However, that doesn't mean they'll stop working after that period — their efficiency just gradually decreases over time.
On average, panels lose about 0.5%–1% of efficiency per year. After 25 years, your panels should still produce around 80–85% of their original capacity.
Types of Warranties
- Product Warranty: Covers material and workmanship defects (typically 10–15 years)
- Performance Warranty: Guarantees power output (usually 25 years)
- Installation Warranty: Provided by the installer, covering labor and roof attachment (5–10 years)
Factors That Affect Longevity
Several environmental and system-related factors can impact the lifespan of your panels:
- Climate: Panels operate better in cooler climates but must be designed to withstand local weather (e.g. snow, hail, heat)
- Installation Quality: Proper mounting and electrical work reduce long-term risks
- Cleaning & Debris: Accumulated dirt or shading can reduce efficiency
Maintenance Tips
- Clean panels 1–2 times a year with a soft brush or hose
- Trim trees that may cause shading or drop leaves
- Check inverter status regularly — it should show green lights
- Schedule a professional inspection every 3–5 years
What Happens After 25 Years?
Even after their warranty ends, your solar panels will likely still produce electricity — just at a slightly reduced rate. You can choose to keep using them, add new panels, or upgrade the full system if better technology is available.
Conclusion
Solar panels are a long-term, low-maintenance investment. With warranties of up to 25 years and proper care, they can generate clean electricity for decades. Be sure to ask your installer about warranty terms and follow simple maintenance routines to get the most out of your solar system.