General Information
    • ISSN: 1793-821X (Print)
    • Abbreviated Title: J. Clean Energy Technol.
    • Frequency: Quarterly
    • DOI: 10.18178/JOCET
    • Editor-in-Chief: Prof. Haider F. Abdul Amir
    • Executive Editor: Ms. Jennifer Zeng
    • Abstracting/ Indexing:  INSPEC (IET), Electronic Journals Library, Chemical Abstracts Services (CAS), Ulrich's Periodicals Directory, Google Scholar, ProQuest, CNKI.
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Universiti Malaysia Sabah, Malaysia.
I would like to express my appreciation to all the reviewers and editors, who have been working
very hard to ensure the quality of the journal. It's my honor to work with such a wonderful team.

JOCET 2017 Vol.5(5): 378-382 ISSN: 1793-821X
DOI: 10.18178/JOCET.2017.5.5.401

Analysis of Aggregated Solar PV Output in South Africa

Jyotsna Singh, Bhishma Tyagi, Lucky Ntsangwane, and Joel Botai
Abstract—Present work deals with the analysis of aggregated solar photovoltaic plants output (ASPV_op in kWh) (South Africa) for the year 2015. The box plot of monthly ASPV_op has shown lower values in winter and higher values in spring and summer. The histograms have also been plotted to understand the variation of ASPV_op in different seasons. The histograms of ASPV_op have confirmed that it is not normally distributed. Monthly variation of ASPV_op was similar to monthly surface incident shortwave flux (SISW in Wm-2). Morlet wavelet has been used for the investigation ASPV_op. The wavelet power spectrum shows significant (at 5 % level) power concentration between 2-16 days. Wavelet analyses of ASPV_op suggested that days of mid-summer to early autumn have significant power concentrated from 8 to 16 days band. In other seasons power is concentrated almost less than 8 days. Almost all days of spring have shown significant power concentration (< 8days).

Index Terms—Surface incident shortwave flux, photovoltaic output, wavelet transform, Morlet wavelet, South Africa.

Jyotsna Singh, Lucky Ntsangwane, Joel Botai are with the South African Weather Service, 442 Rigel Avenue South, Erasmusrand, Pretoria, South Africa-0181 (e-mail:,,
Bhishma Tyagi is with National Institute of Technology, Rourkela, Odisha, India (e-mail:


Cite:Jyotsna Singh, Bhishma Tyagi, Lucky Ntsangwane, and Joel Botai, "Analysis of Aggregated Solar PV Output in South Africa," Journal of Clean Energy Technologies vol. 5, no. 4, pp. 378-382, 2017.

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