Waste painéis solares
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
30% após 30 anos
About this calculator
This calculator estimates solar panel efficiency loss over time, using a 0.5% annual degradation rate and a typical 25-30 year lifespan. Based on linear decay, panels retain ~30% of original efficiency after 30 years. It's ideal for planning solar installations, assessing long-term ROI, or comparing panel technologies.
It calculates efficiency by multiplying the annual degradation (0.5%) by years in use and subtracting from 100%. For example: after 20 years, efficiency drops to 90% (100% - 10%). Note that external factors like dirt, shading, or manufacturing flaws, unaccounted in this tool, can accelerate degradation.
Use it to evaluate solar system viability for specific timelines. For instance, if installing panels with a 25-year lifespan, the tool shows efficiency will drop to 87.5%, aiding in panel quantity planning. It also helps assess the impact of regular maintenance on performance retention.
Frequently asked questions
What happens to panels after 30 years?
Efficiency drops to 30% of original, but they still generate power. Many systems replace panels at 25-30 years to optimize ROI.
Is degradation linear in all panels?
No. Initial degradation may be faster (first 5 years), then stabilize. The tool uses an average 0.5% for simplified calculations.
Can I use this calculator for different panel types?
Yes, but modern panels (like monocrystalline) may degrade slower (0.3% to 0.4% annually).
How does dirt affect results?
The calculator excludes dirt. Panels in polluted/dusty areas may lose 5-10% additional efficiency yearly.