Abstract
It is essential to repeat a test of a given construct in research in order to underpin knowledge, support validity and enable its application in other contexts. The purpose of this article is to present repetitive test results validating the optimum tilt angle of a stationary PV module that was installed in a semi-arid region of South Africa. An experimental design incorporating a two-year longitudinal study is used. The results for 2016 and 2017 reveal that a PV module with a tilt angle of Latitude plus 10° yielded the highest output power for winter months, while a PV module with a tilt angle of Latitude minus 10° yielded the highest output power for summer months. However, for both years, a tilt angle set to the Latitude angle of the installation site yielded the highest overall average output power (60.02 Wh per day). It is therefore recommended to install stationary PV modules at a tilt angle equal to the Latitude of the installation site for a semi-arid region in the southern hemisphere.
Highlights
It is essential to repeat a test of a given construct in research in order to underpin knowledge, support validity and enable its application in other contexts
They found that a tilt angle lower than Latitude of the installation site yielded the highest output power, while for the winter season the tilt angle had to be higher than Latitude
Weather conditions had an enormous influence on the amount of output power produced; the results showed that a tilt angle of φ + 10° produced the highest yield for winter and φ – 10° for summer
Summary
It is essential to repeat a test of a given construct in research in order to underpin knowledge, support validity and enable its application in other contexts. The purpose of this article is to present repetitive test results validating the optimum tilt angle of a stationary PV module that was installed in a semi-arid region of South Africa. Outright legitimacy requires that information be completely legitimate the majority of the time [4] In this manner, when redundant testing yields similar outcomes over a delayed timeframe, at that point abso-lute legitimacy results. This is especially vital when considering the impact of climate change on the production of electrical energy from renewable energy systems. The Faculty of Engineering and Information Technology is situated on the main campus of CUT, with a number of laboratories and research facilities One such facility has a fourth-floor balcony facing northwards, with unobstructed views of the sun. The exact Latitude and Longitude coordinates of this balcony is 29°07'16.7"S and 26°12'58.2"E, which serves as the research installation site for three identical 10 W PV modules used in the experimental setup
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