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Proceedings Paper

Examination of a size-change test for photovoltaic encapsulation materials
Author(s): David C. Miller; Xiaohong Gu; Liang Ji; George Kelly; Nichole Nickel; Paul Norum; Tsuyoshi Shioda; Govindasamy Tamizhmani; John H. Wohlgemuth
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Paper Abstract

We examine a proposed test standard that can be used to evaluate the maximum representative change in linear dimensions of sheet encapsulation products for photovoltaic modules (resulting from their thermal processing). The proposed protocol is part of a series of material-level tests being developed within Working Group 2 of the Technical Committee 82 of the International Electrotechnical Commission. The characterization tests are being developed to aid module design (by identifying the essential characteristics that should be communicated on a datasheet), quality control (via internal material acceptance and process control), and failure analysis. Discovery and interlaboratory experiments were used to select particular parameters for the size-change test. The choice of a sand substrate and aluminum carrier is explored relative to other options. The temperature uniformity of ±5°C for the substrate was confirmed using thermography. Considerations related to the heating device (hot-plate or oven) are explored. The time duration of 5 minutes was identified from the time-series photographic characterization of material specimens (EVA, ionomer, PVB, TPO, and TPU). The test procedure was revised to account for observed effects of size and edges. The interlaboratory study identified typical size-change characteristics, and also verified the absolute reproducibility of ±5% between laboratories.

Paper Details

Date Published: 16 October 2012
PDF: 12 pages
Proc. SPIE 8472, Reliability of Photovoltaic Cells, Modules, Components, and Systems V, 84720T (16 October 2012); doi: 10.1117/12.929796
Show Author Affiliations
David C. Miller, National Renewable Energy Lab. (United States)
Xiaohong Gu, National Institute of Standards and Technology (United States)
Liang Ji, Underwriters Labs. Inc. (United States)
George Kelly, BP Solar International Inc. (United States)
Nichole Nickel, The Dow Chemical Co. (United States)
Paul Norum, SolarWorld Industries America (United States)
Tsuyoshi Shioda, Mitsui Chemicals, Inc. (Japan)
Govindasamy Tamizhmani, TÜV Rheinland PTL (United States)
John H. Wohlgemuth, National Renewable Energy Lab. (United States)

Published in SPIE Proceedings Vol. 8472:
Reliability of Photovoltaic Cells, Modules, Components, and Systems V
Neelkanth G. Dhere; John H. Wohlgemuth, Editor(s)

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