LID loss factor

What it is

The power a module loses permanently during its first days of exposure to sunlight, as a fraction.

Typical values and how to get it

0.5 to 2 % for p-type crystalline silicon, close to 0 for n-type modules. The PAN file may suggest a value. If not given: 0: no light-induced degradation.

How it is applied

$$P_{\text{after}} = P_{\text{before}}\,(1 - f_{\text{LID}})$$

where

Symbol	Meaning	Unit
$P_{\text{after}}$	the array DC power after this derate	W
$P_{\text{before}}$	the array DC power before it	W
$f_{\text{LID}}$	this input as a fraction	—

References

1. Lindroos & Savin 2016, Review of light-induced degradation in crystalline silicon solar cells, Solar Energy Materials and Solar Cells 147 115–126

API

dc_losses.lid_loss — sent as a fraction 0–1

Symbols follow the symbol registry.