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How Long Do Solar Panels Last? Lifespan, Warranties, and Maintenance
5 min read
When you invest in solar, you want to know it'll last. Here's what decades of real-world data tell us about solar panel lifespan and performance.
Solar Panel Lifespan
- Expected lifespan: 25–30+ years of productive use
- Degradation rate: Modern panels degrade at about 0.3–0.5% per year. After 25 years, they're still producing 87–92% of their original output.
- They don't just stop working — Panels continue producing electricity long past their warranty period. Many panels from the 1980s are still functioning today.
Warranty Coverage
- Product warranty: 12–25 years (covers manufacturing defects)
- Performance warranty: 25–30 years (guarantees minimum output, typically 80–90% at year 25)
- Inverter warranty: 12–25 years depending on type (microinverters tend to have longer warranties)
- Battery warranty: 10–15 years
Maintenance Requirements
Solar panels are remarkably low-maintenance. Here's what's actually needed:
- Cleaning: Occasional rain handles most of it. In dusty areas, an annual rinse with a garden hose is sufficient. Professional cleaning costs $100–$200.
- Monitoring: Most modern systems include monitoring apps that alert you to any performance issues.
- Inspections: An annual visual check is good practice but not strictly required.
- Tree trimming: Keep trees from shading your panels as they grow.
What Can Go Wrong?
The most common issue isn't the panels themselves — it's the inverter. String inverters may need replacement once during the system's life (around year 12–15). Microinverters typically last the full 25+ years. This is covered by warranty in most cases.
The Long-Term Value
Solar is a 25+ year asset that requires virtually no ongoing investment. Compare that to a car (needs gas, insurance, maintenance), a pool (chemicals, equipment, repairs), or even a roof (eventual replacement). Solar panels just sit there, quietly saving you money for decades.