Research Papers

Comparative Analysis of Crystalline and Double-Junction Amorphous Silicon Modules Performance in Outdoor Conditions

[+] Author and Article Information
Cristina Cornaro

Department of Enterprise
Engineering and CHOSE,
University of Rome Tor Vergata,
Via del Politecnico,
1, 00133 Rome, Italy
e-mail: cornaro@uniroma2.it

Davide Musella

Green Utility SPA,
Via A. Bargoni,
78, 00153 Rome, Italy
e-mail: davide.musella@greenutility.eu

Contributed by the Solar Energy Division of ASME for publication in the Journal of Solar Energy Engineering. Manuscript received September 5, 2012; final manuscript received February 28, 2013; published online June 11, 2013. Assoc. Editor: Santiago Silvestre.

J. Sol. Energy Eng 135(3), 031022 (Jun 11, 2013) (6 pages) Paper No: SOL-12-1218; doi: 10.1115/1.4023968 History: Received September 05, 2012; Revised February 28, 2013

The paper deals with an extensive photovoltaic (PV) modules monitoring activity carried out at the outdoor station ESTER (Solar Energy TEst and Research) of the University of Rome Tor Vergata, Italy. The purpose of the work was to evaluate and compare the performance of PV silicon modules of polycrystalline (poli-Si) and amorphous (a-Si) technologies during a medium-term outdoor exposure at optimized tilt angle, facing south. Two PV modules, one polycrystalline silicon and one double-junction amorphous silicon, have been exposed since May 2009 until Oct. 2010. A complete characterization of the weather conditions at the site during the test has been performed, and the most relevant parameters for the performance comparison of the two technologies have been derived. In order to compare different technologies and power productions, the energy yield (Y) and performance ratio (PR) for the two modules have been evaluated on a monthly and yearly basis. The typical seasonal trend of PR has been observed for the polycrystalline module, essentially due to the temperature influence on the module performance. For the a-Si module, instead, a degradation trend has been observed for the first months of operation. Subsequently, a significant recovery in the PR and energy production has been registered.

Copyright © 2013 by ASME
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Jardine, C. N., ConibeerG. J., and Lane, K., 2001, “PV-COMPARE: Direct Comparison of Eleven PV Technologies at Two Locations in Northern and Southern Europe,” Proceedings of the 17th European Conference on Photovoltaic Solar Energy Conversion, Munich.
Gottschalg, R., del Cueto, J. A., Betts, T. R., and Infield, D. G., 2005, “Seasonal Performance of A-Si Single and Multijunction Modules in Two Locations,” Proceedings of the 31st IEEE PV Specialists Conference, Buena Vista, FL, January 3–7.
CarrA. J., and Pryor, T. L., 2004, “A Comparison of the Performance of Different PV Module Types in Temperate Climates,” Sol. Energy, 76, pp. 285–294. [CrossRef]
Żdanowicz, T., Rodziewicz, T., and Ząbkowska-Wacławek, M., 2004, “Effectiveness of the Sun Tracking Option During Different Insolation Periods,” Proceedings of the 19th European Photovoltaic Solar Energy Conference, Paris, June 7–11.
Longden, D., Aitchison, L., Gottschalg, R., and Infield, D. G., 2004, “Long-Term Performance of a CdTe Array,” Proceedings of the 19th European Photovoltaic Solar Energy Conference, Paris, June 7–11.
Żdanowicz, T., Prorok, M., Kołodenny, W., Stellbogen, D., and SchaefflerR. R., 2005, “Evaluation of Performance Parameters of CIS Modules Using Long-Term Outdoor Monitoring Data,” Proceedings of the 20th European Photovoltaic Solar Energy Conference, Barcelona, June 6–10.
Chianese, D., Friesen, G., Pasinelli, P., Pola, I., Realini, A., Cereghetti, N., and Bernasconi, A., 2007, “Direct Performance Comparison of PV Modules,” Proceedings of 22nd EPVSEC, Milano, September 3–7.
Betts, T. R., Zdanowicz, T., Prorok, M., Kolodenny, W., de Moor, H., v.d. Borg, N., Stellbogen, D., Hohl-Ebinger, J., Warta, W., Friesen, G., Chianese, D., Guerinde Montgareuil, A., Herrmann, W., DiazBerrade, J., Moracho, J., Cueli, A. B., Lagunas, A. R., and Gottschalg, R., 2006, “Photovoltaic Performance Measurements in Europe: PV-Catapult Round Robin Tests,” IEEE 4th World Conference on Photovoltaic Energy Conversion, Waikoloa, HI, May 7–12.
Dunlop, E. D., and Halton, D., 2006, “The Performance of Crystalline Silicon Photovoltaic Solar Modules After 22 Years of Continuous Outdoor Exposure,” Prog. Photovoltaics, 14, pp. 53–64. [CrossRef]
Spena, A., Cornaro, C., and Serafini, S., 2008, “Outdoor ESTER Test Facility for Advanced Technologies PV Modules,” Proceedings of the 33rd IEEE PV Specialists Conference, San Diego, CA, May 11–16.
Spena, A., Cornaro, C., Intreccialagli, G., and Chianese, D., 2009, “Data Validation and Uncertainty Evaluation of the ESTER Outdoor Facility for Testing of PV Modules,” Proceedings of the 24th European Photovoltaic Solar Energy Conference and Exhibition, Hamburg, Germany, September 21–24.
Spena, A., Cornaro, C., and Traini, P. G., 2008, “Noria Data Management Software for PV Modules Characterization in the Outdoor ESTER Test Facility,” Proceedings of the 23rd European Photovoltaic Solar Energy Conference and Exhibition, Valencia, Spain, September 1–5.
Rahim, R., Baharuddin, and Mulyadi, R., 2004, “Classification of Daylight and Radiation Data Into Three Sky Conditions by Cloud Ratio and Sunshine Duration,” Energy Build., 36, pp. 660–666. [CrossRef]
IEC, 2007, “Photovoltaic Devices—Part 2: Requirements for Reference Solar Devices,” IEC Paper No. 60904-2.
Marion, B., Adelstein, J., Boyle, K., Hayden, H., Hammond, B., Fletcher, T., Canada, B., Narang, D., Shugar, D., Wenger, H., Kimber, A., Mitchell, L., Rich, G., and Townsend, T., 2005, “Performance Parameters for Grid-Connected PV Systems,” Proceedings of the 31st IEEE Photovoltaics Specialists Conference, Lake Buena Vista, FL, January 3–7.
Cornaro, C., Musella, D., Chianese, D., Friesen, G., and Dittmann, S., 2010, “Outdoor PV Module Performance Comparison at Two Different Locations,” Proceedings of the AMSE-ATI-UIT2010 Conference on Thermal and Environmental Issues in Energy Systems, Sorrento, Italy, May 16–19.
Staebler, D. L., and Wronski, C. R., 1977, “Reversible Conductivity Changes in Discharge-Produced Amorphous Si,” Appl. Phys. Lett., 31(4), pp. 292–294. [CrossRef]
Blaesser, G., and Zaaiman, W., 1991, “On-Site Power Measurement on Large PV Arrays,” 10th European Solar Energy Conference, Lisbon, Portugal, April 8–12.
Minemoto, T., Nagae, S., and Takakura, H., 2007, “Impact of Spectral Irradiance Distribution and Temperature on the Outdoor Performance of Amorphous Si Photovoltaic Modules,” Sol. Energy Mater. Sol. Cells, 91, pp. 919–923. [CrossRef]
Gottschalg, R., Betts, T. R., Infield, D. G., and Kearney, M. J., 2005, “The Effect of Spectral Variations on the Performance Parameters of Single and Double Junction Amorphous Silicon Solar Cells,” Sol. Energy Mater. Sol. Cells, 85, pp. 415–428. [CrossRef]
Intreccialagli, G., 2007, “Prime Misure Outdoor su un Modulo Fotovoltaico di Corrente Produzione Industriale,” Laurea thesis, University of Rome Tor Vergata, Rome.


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Fig. 1

Overview of the ESTER station

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Fig. 2

Layout of the data acquisition system

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Fig. 3

Raw and filtered power data versus in-plane irradiance for KC125 and EPV-50. Filtering data procedure applied to the month of July 2009.

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Fig. 4

Irradiation and average ambient temperature evaluated at different irradiance classes for the period of test

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Fig. 5

Cloud ratio frequency evaluated for each month of the test

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Fig. 6

Monthly yield calculated for the KC125 and the EPV-50 modules

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Fig. 7

Monthly performance ratio (PR) calculated for the KC125 and the EPV-50 modules

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Fig. 8

Monthly performance ratio (PR) calculated for the KC125 and monthly average module temperature

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Fig. 9

Initial STC power fraction of the EPV-50 amorphous silicon module for the first four months of operation in real operating conditions




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