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Amorphous, mono- and poly-crystalline silicon PV modules: a comparative study of their relative efficiencies under various outdoor conditions

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8 Author(s)
Faiman, D. ; Dept. of Solar Energy & Environ. Phys., Ben-Gurion Univ. of the Negev, Sede Boqer Campus, Israel ; Bukobza, D. ; Kabalo, S. ; Karki, I.
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3 sets of PV modules, each set having Si cells of a different morphological structure (a-, mc- and pc- ), were operated side-by-side as grid-connected systems, and continuously monitored for one year. The resulting hourly data were re-normalized in a number of alternative ways so as to permit meaningful efficiency comparisons. In particular, comparisons were made with respect to (1) total system efficiency; (2) specific energy delivery [Wh/Wp(STC)]. The purpose of the study was to identify external conditions under which the relative rating of any pair of module types can become interchanged. We find that although the a-Si system gave a higher specific energy delivery throughout the summer half of the year, on an all-year basis, the c-Si modules produced slightly higher overall figures. The slight summer advantage of a-Si is attributed to a combination of spectrum and temperature effects.

Published in:

Photovoltaic Energy Conversion, 2003. Proceedings of 3rd World Conference on  (Volume:2 )

Date of Conference:

18-18 May 2003