TRACKING OF I-V CURVES ON INDUSTRIAL PV MODULES: A BETTER UNDERSTANDING OF THE OUTDOOR STAEBLER WRONSKI EFFECT

摘要

This paper reports on the approach chosen by NTB since 2005 to perform outdoor monitoring of solar PV modules. Especially thin-film silicon PV modules are known to show a cyclic power output. Such metastable behavior of the electrical power observed correlates with warm/cool climatic variations. This is the motivation to collect not only electrical module data but also meteorological data. ALIDO (Another Light Induced Illumination Output) stands for the hardware capability and the data mining of such acquisition as performed in Switzerland as a first place, other locations may come. Especially the relationship between the amount of light-induced power variation and the influence of the light spectrum is investigated. Spectrally resolved PV-module behavior is of key-interest for multijunction devices. Based on one sunny day, the comparison of PV-data of a single-junction module with PV-data of a multijunction module reveal a detailed study on top-limiting or bottom-limiting sub-cells of the multijunction device under test.