Solar Panel Degradation Calculator
Model how panel output declines over 25 years.
Free panel tool
Solar Panel Degradation Calculator
See how your solar panel output declines over 25 years — with exact kWh at year 1, 5, 10, 15, 20 and 25.
Panel specs
Degradation
Standard warranty: 0.5%/yr. Budget panels: 0.7-0.8%. Premium: 0.25-0.4%.
Initial light-induced degradation. Industry standard: 2%. Premium panels: 1%.
Heat, dust, wiring, inverter. 20% is standard.
Output at year 10 kWh/yr
Year 50 kWh/yr
Year 100 kWh/yr
Year 150 kWh/yr
Year 200 kWh/yr
Year 250 kWh/yr
25-year total production0 kWh
Production lost to degradation0 kWh
Retained at year 250%
Based on linear degradation model. Actual degradation depends on panel quality, installation, climate, and maintenance. Most panels carry a 25-year warranty guaranteeing 80-87.5% output.