How to use the Solar Panel Degradation Calculator
The Formula
Current output = year-1 kWh × (1 − degradation %)^age. Most monocrystalline panels lose ~0.5% per year after an initial first-year stabilization.
Practical Example
Manufacturers often guarantee ~80–90% of rated power at 25 years. This tool uses your chosen annual % for quick estimates.
About Solar Panel Degradation Calculator
Degradation formula
Current output = year-1 kWh × (1 − degradation %)^age. Most monocrystalline panels lose ~0.5% per year after an initial first-year stabilization.
Warranty context
Manufacturers often guarantee ~80–90% of rated power at 25 years. This tool uses your chosen annual % for quick estimates.
Frequently asked questions
Q: Is degradation linear? A: We model compound annual loss—a close fit for planning. Q: Does cleaning help? A: Soiling is separate from cell degradation.