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No Panel Lasts Forever
Solar panel manufacturers typically provide a 25-year linear power output warranty guaranteeing that the panel will produce at least 80% of its rated power at year 25. Understanding the degradation mechanisms and realistic degradation rates helps set accurate long-term yield expectations.
Degradation Mechanisms
Mechanism | When | Typical Magnitude | Prevention |
|---|---|---|---|
Light-Induced Degradation (LID) | First 1–100 hours of operation | 1–2% for PERC; 0.3% for LID-free mono | Specify LID-free cells (TOPCon, HJT) |
Potential-Induced Degradation (PID) | Ongoing — high system voltage + humidity | Up to 30% if unchecked | Anti-PID modules; PID recovery function in inverter; correct system grounding |
UV degradation of encapsulant | Years 5–20 | 0.3–0.5%/year contribution | Quality EVA or POE encapsulant |
Cell micro-cracking | From installation onwards; accelerated by thermal cycling | Variable — 0.1–0.5%/year contribution | Correct installation, avoid foot traffic on panels |
Delamination | Years 10–20 in hot humid climates | Sudden localised failure | Quality manufacturing; avoid moisture ingress at frame edges |
Realistic Degradation Rates by Technology
Panel Technology | Year 1 Drop | Annual Degradation (Years 2–25) | Year 25 Output (%) |
|---|---|---|---|
Standard PERC mono | 2.0% | 0.55%/year | ~85% |
Premium LID-free PERC | 1.0% | 0.45%/year | ~88% |
TOPCon N-type | 0.5% | 0.40%/year | ~90% |
HJT | 0.3% | 0.30%/year | ~92% |
For a 6.6 kW system, the difference between 85% and 92% performance at year 25 represents approximately 462 kWh/year — several hundred dollars in electricity value over the panel's remaining life.
Engr. Jason Morales — Founder, SolarEnergyPH
