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Panel Degradation
Capacity remaining after N years at given degradation.
PerformanceCore inputs only — quick sizing with engineering defaults.
Inputs (SI units)
Results
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Engineering Formula
- Year-1 drop = 2.0% (LID for mono-PERC)
- P(t) = P₀ × (1 − LID) × (1 − d)^(t−1)
Modern mono-PERC / TOPCon shows 2% year-1 light-induced degradation, then 0.4–0.55%/yr linear. Warranties typically guarantee 80–85% at year-25.
Step-by-step Calculation
- 1.After LID
P₀×0.989.8 kWp - 2.Linear decay
×(1-d)^(t-1)0.876 - 3.Final
= P(t)8.59 kWp
Design Assumptions
- • Constant post-year-1 degradation.
- • No hot-spot / PID failures.
Engineering Tips
- ◆Ask for datasheet linear warranty curve.
- ◆TOPCon and HJT often warrant ≥ 87.4% at Y25.
Warnings
- ▲Degradation > 1%/yr indicates PID or moisture ingress — investigate.
Standards & References
IEC 61215IEC TS 63209 (extended stress)
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