Degradation in N-Type Modules: Myth vs Measured Reality

N-Type solar modules promise lower degradation and higher lifetime output. But do field results support these claims? The answer is mostly yes. Yet the full story goes beyond marketing numbers.

Traditional P-Type PERC modules often suffer from Light Induced Degradation (LID) and Light and Elevated temperature induced (LeTID) losses which is typically seen in climates having higher ambient temperatures. N-Type technologies such as TOPCon and HJT reduce these effects because they avoid boron-oxygen defects. Independent testing shows N-Type modules can limit first-year degradation below 1%, while many P-Type modules lose 1-3% early in operation.

Field performance data also supports lower annual degradation. Recent industry studies place N-Type annual degradation between 0.3% and 0.4% per year post first year standard degradation. Many P-Type systems still operate closer to 0.5% or higher. Over 25 years, this gap creates a significant energy yield advantage. However, lower degradation does not mean zero degradation.