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Dust-induced shading on photovoltaic modules

journal contribution
posted on 03.06.2015, 13:36 by Hassan Qasem, Tom Betts, Harald Mullejans, H. AlBusairi, Ralph Gottschalg
The effect of dust on photovoltaic modules is investigated with respect to concentration and spectral transmittance. Samples were collected in the form of raw dust as well as accumulated dust on exposed sheets of glass at different tilt angles. Spectral transmittance of the samples was determined. Transmittance variation between top, middle and bottom was identified for samples collected at different inclinations, where the worst case was seen at a tilt angle of 30o with a non-uniformity of 4.4% in comparison with 0.2% for the 90° tilt. The measured data showed a decrease in transmittance at wavelengths <570 nm. Integrating this with measured spectral responses of different technologies demonstrates that wide band-gap thin-film technologies are affected more than, for example crystalline silicon technologies. The worst case is amorphous silicon, where a 33% reduction in photocurrent is predicted for a dust concentration of 4.25 mg/cm2. Similarly, crystalline silicon and CIGS technologies are predicted to be less affected, with 28.6% and 28.5% reductions in photocurrent, respectively. The same procedure was repeated with varying Air Mass (AM), tilt angle and dust concentration values to produce a soiling ratio table for different technologies under different AM, tilt angle and dust concentration values.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Progress in Photovoltaics: Research and Applications

Volume

22

Issue

2

Pages

218 - 226

Citation

QASEM, H. ... at el., 2014. Dust-induced shading on photovoltaic modules. Progress in Photovoltaics: Research and Applications, 22 (2), pp. 218 - 226.

Publisher

© John Wiley & Sons, Ltd.

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2014

Notes

Closed access

ISSN

1062-7995

eISSN

1099-159X

Language

en