Light soaking gain (CIS/CIGS)

What it is

A flat gain on the array power for copper indium (gallium) selenide modules, whose output rises during the first hundreds of hours of sun exposure. The simulated year describes the system after the gain has settled. The gain applies to CIS and CIGS modules only; every other technology ignores it.

Typical values and how to get it

Manufacturers of CIGS modules that quote a gain give 3 to 5 %. If not given: 0: no light-soaking gain.

How it is applied

$$P_{\text{after}} = P_{\text{before}}\,(1 + f_{\text{soak}})$$

where

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

API

dc_losses.light_soaking_gain — sent as a fraction 0–1

Symbols follow the symbol registry.