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Proceedings Paper

Characterization of PV modules by combining results of mechanical and electrical analysis methods
Author(s): Martin Sander; Bastian Henke; Hannes Schwarz; Sascha Dietrich; Stefan Schweizer; Matthias Ebert; Jörg Bagdahn
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Paper Abstract

Photovoltaic modules (PV modules) are supposed to have a lifetime of more than 20 years under various environmental conditions like temperature changes, mechanical loads, etc. Common outdoor exposure may influence efficiency and lifetime which necessitates assessment of PV module performance and detection of output deficits. For this purpose reliable and nondestructive testing methods are desirable. Commercially available PV modules were tested by different analysis methods. The PV module's electrical properties were investigated by thermography and electroluminescence measurements. The combination of these two techniques is well-suited to detect many cell and module defects. A crystalline module showed significant cell breakage after temperature cycle test. To observe the mechanisms of this specific defect type laminated test specimens on smaller scales were produced and analyzed over production process and during temperature cycles derived from the international standards IEC 61215 and IEC 61646. The defect study on small scales allows conclusions about the defect's influence on larger PV modules. Further methods capable for mechanical characterization like Laser Doppler vibrometry, surface geometry scan and digital image correlation are presented briefly. The combination of the methods mentioned above allows a very precise assessment of the mechanical and electrical capability which is essential for reliability and lifetime concepts.

Paper Details

Date Published: 19 August 2010
PDF: 12 pages
Proc. SPIE 7773, Reliability of Photovoltaic Cells, Modules, Components, and Systems III, 777308 (19 August 2010); doi: 10.1117/12.860814
Show Author Affiliations
Martin Sander, Fraunhofer Ctr. for Silicon Photovoltaics (Germany)
Fraunhofer Institute for Mechanics of Materials (Germany)
Bastian Henke, Fraunhofer Ctr. for Silicon Photovoltaics (Germany)
Martin-Luther-Univ. Halle-Wittenberg (Germany)
Hannes Schwarz, Fraunhofer Ctr. for Silicon Photovoltaics (Germany)
Sascha Dietrich, Fraunhofer Ctr. for Silicon Photovoltaics (Germany)
Stefan Schweizer, Fraunhofer Ctr. for Silicon Photovoltaics (Germany)
Martin-Luther-Univ. Halle-Wittenberg (Germany)
Matthias Ebert, Fraunhofer Ctr. for Silicon Photovoltaics (Germany)
Jörg Bagdahn, Fraunhofer Ctr. for Silicon Photovoltaics (Germany)


Published in SPIE Proceedings Vol. 7773:
Reliability of Photovoltaic Cells, Modules, Components, and Systems III
Neelkanth G. Dhere; John H. Wohlgemuth; Kevin Lynn, Editor(s)

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