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Proceedings Paper

Development and application of a UV light source for PV-module testing
Author(s): Michael Koehl; Daniel Philipp; Norbert Lenck; Matthias Zundel
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Paper Abstract

Photovoltaic (PV)-modules are exposed to solar irradiation, which includes Ultra-violet (UV) light. UV light is wellknown as degradation factor for polymeric materials, as used for encapsulation of PV-cells. Therefore they are protected by UV-filtering glass or UV protecting additives. The UV-stability is only tested on a very low level (total UV energy of 15kWh/m2) according to the actual type approval standards (IEC 61215, IEC61646, e.g.). An undefined acceleration is provided by the testing temperature of 60°C. The real UV-dose can reach more than 120 kWh/m2 per year, however. The module-temperature during high UV-irradiation ranges between 40°C and 60°C, usually. The main reason for the inadequate test conditions is the lack of well-defined and inexpensive UV-light sources and therefore small test capacities. We developed an UV-radiation unit based on fluorescence tubes, which have the advantage of low visible and NIR irradiation avoiding overheating of the samples. The spectral irradiation is solar-like in the short-wavelength UV and lower in the long-wavelength UV, with a limited number of disturbing emission-lines. The design of the unit has been optimized for high UV-intensities up to 5X and usage on both sides. Our prototype has an area of 1.7m * 3m, which yields an usable testing area of 6m *1.7m. The unit is designed for usage in humid ambient in a temperature range up to 90°C for the future development of combined damp-heat and UV tests, in order to get the tests closer to reality.

Paper Details

Date Published: 20 August 2009
PDF: 7 pages
Proc. SPIE 7412, Reliability of Photovoltaic Cells, Modules, Components, and Systems II, 741202 (20 August 2009); doi: 10.1117/12.825939
Show Author Affiliations
Michael Koehl, Fraunhofer Institute for Solar Energy Systems (Germany)
Daniel Philipp, Fraunhofer Institute for Solar Energy Systems (Germany)
Norbert Lenck, SCHOTT Solar GmbH (Germany)
Matthias Zundel, SLZ Maschinenbau GmbH (Germany)

Published in SPIE Proceedings Vol. 7412:
Reliability of Photovoltaic Cells, Modules, Components, and Systems II
Neelkanth G. Dhere; John H. Wohlgemuth; Dan T. Ton, Editor(s)

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