Title:	Development of Daylight Photoluminescence Technique for Photovoltaic Modules and Investigation of Temperature Dependency
Author(s):	L. Koester, A. Astigarraga, S. Lindig, D. Moser
Keywords:	Degradation, Photoluminescence, System Performance, PV Module, Fault Detection
Topic:	Photovoltaic Modules and BoS Components
Subtopic:	PV Module Design, Manufacture, Performance and Reliability
Event:	37th European Photovoltaic Solar Energy Conference and Exhibition
Session:	4CO.4.2
Pages:	908 - 913
ISBN:	3-936338-73-6
Paper DOI:	10.4229/EUPVSEC20202020-4CO.4.2
Price:	0,00 EUR
Document(s):	paper

Abstract/Summary:

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Daylight Photoluminescence (dPL) is a relatively novel imaging technique using the principle idea of photoluminescence with the sun as excitation source. The difficult process of filtering the luminescence signal is described by means of implementing a dPL technique at EURAC Research in Bolzano, Italy. The described approach uses modern inverter or maximum power point tracker to alter the working point of modules, which allows imaging of two different images, whose subtraction results in the luminescence signal. Further, the impact of temperature on the luminescence signal is investigated. For this, the signal intensity is measured with dPL for different temperatures under controlled conditions. The impact that temperature has on different factors influencing the luminescence intensity is described. Finally, the impact of temperature on dPL in practical use is calculated from the results, presenting a first attempt to calculate the temperature coefficient of signal intensity in the dPL image.