LID - Light Induced Degradation and Module Degradation

[Ana Sofía Lanza]

Hello,

I ran a simulation with a 30‑year projection, and when reviewing the loss diagram, I noticed that the LID degradation (1% in this case) is being applied not only in the first year but throughout all 30 years. Is this correct, or am I misinterpreting the output? Higlighted in green

Additionally, when reviewing the module degradation loss for Year 1, aside from the 1% LID, the model also applies a 0.20% degradation loss, which corresponds to the 50% of the annual 0.40% degradation rate starting from Year 2. However, we also see that this same 0.20% appears in the module array mismatch loss. Wouldn’t that mean the loss is being double-counted? Higlighted in blue

Could you please clarify if this interpretation is correct and why it is the way it is.

Grretings,

 

[Michele Oliosi]

Hi,

• LID is a degradation pathway, which you can see as a definitive change in the module performance. It occurs in the first hours of exposure to sunlight, but then the effect remains.
• Degradation is modeled as a fixed ratio for the whole year, but in reality this loss should increase throughout the year. This is why we choose the mid-year mark as representative for the yearly degradation loss factor. Hence the 50% applied on the first year.
• Module array mismatch loss is different from degradation, you find its value in "Detailed losses > Module quality, LID, mismatch"