The Truth About PV Panel Degradation Rates: First-Year vs. Long-Term
Mar 18, 2026
How to Choose Low-Degradation Products
Whether investing, deploying C&I systems, or sourcing for Nigeria, PV panel degradation is a critical metric. It directly determines 25-year power output and ROI. Let’s demystify degradation to help you select high-stability, premium products.
I. What is PV Panel Degradation Rate?
Simply put, it’s the percentage drop in a panel's actual power output compared to its initial rated power after operating outdoors for a certain period.
Industry standard defines the end of useful life when power output degrades to 80% of its initial value. This metric directly safeguards long-term revenue, making it crucial for projects in demanding environments.
Calculation Formula
(Pinitial - Poperating) ÷ Pinitial × 100%
II....
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