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Browsing by Author "Roro, Kittessa T"

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A guideline for public entities on cost-efficient procurement of PV assets

Author: Bischof-Niemz, T ; Roro, Kittessa T Date: Sep 2015 Traditionally, when public entities buy an asset under an Engineering, Procurement and Construction (EPC) contract, the screening of the responses to the request for proposals is done in two stages: In a filter stage, all proposals that are ... Read more
How to stimulate the South African rooftop PV market without putting electricity distributors' financial stability at risk

Author: Bischof-Niemz, Thomas ; Roro, Kittessa T ; Milazi, Dominic Date: 2015 In South Africa, embedded PV is at retail grid parity today. It is even cost-competitive to alternative new-build options (“new-build parity”). Many electricity customers are therefore already installing embedded PV. This would lead to an ... Read more
How to stimulate the South African rooftop PV market without putting electricity distributors’ financial stability at risk [Conference presentation]

Author: Bischof-Niemz, Sebastian T ; Roro, Kittessa T ; Milazi, Dominic BK Date: Sep 2015 Due to drastically reduced prices for Photovoltaic (PV) systems and significantly increased electricity tariffs recently, small scale embedded generators (particularly PV units) are now attractive for many electricity customers in South Africa. ... Read more
The impact of synthesis techniques on the properties of hybrid perovskite materials for photovoltaic application

Author: Olaleru, S Akin ; Wamwangi, D ; Kirui, JK ; Roro, Kittessa T ; Mwakikunga, Bonex W ; Palaniyandy, Nithyadharseni ; El-Mahallawy, N ; Rashad, N Date: Jul 2020 Hybrid perovskites are organometal halide materials that are attractive to the researchers owing to impressive physical properties like absorption coefficients. Controlled formation of perovskite crystal during the preparation process is key ... Read more
The importance of PV module reliability research in South Africa

Author: Pratt, Lawrence E ; Roro, Kittessa T ; Basappa Ayanna, Manjunath Date: Jun 2018 This paper will introduce the new C450 international standard for PV module quality assurance programs. Quality assurance testing has been on the rise in the PV industry following the rise in development of large scale PV plants, sometimes ... Read more
Inter laboratory comparison of indoor performance tests on crystalline silicon solar PV modules

Author: Pratt, Lawrence E ; Basappa Ayanna, Manjunath ; May, Siyasanga I ; Roro, Kittessa T ; McCleland, JC ; Zikhali, Q Date: Nov 2019 The paper presents results from an inter laboratory comparison (ILC) of crystalline silicon PV module performance measurements from three different institutions within South Africa. The analysis quantifies the differences in power, current, ... Read more
Is solar PV generated electricity cheap in South Africa?

Author: Roro, Kittessa T Date: Jul 2015 This presentation reflects on photovoltaic (PV) generated electricity in South Africa, and whether it is a cheaper alternative to current generated electricity in the country. It is projected that by 2019 the installed capacity of PV could ... Read more
Microstructure and spectral selectivity of Pt-AI203 nanocoatings for high temperature applications

Author: Nuru, ZY ; Khamlich, S ; Roro, Kittessa T ; Muller, TFG ; Arendse, CJ ; Maaza, M Date: Jul 2011 Monodispersed spherical core-shell particles of Cr/a-Cr2O3 cermet ACG coatings investigated within this contribution could be successfully employed in thermal converters. Their selectivity depends on their chemical, physical and structural ... Read more
Modelling atmospheric radiative transfer conditions and its comparison to empirical solar irradiance in South Africa

Author: Fourie, CH ; Winkler, H ; Roro, Kittessa T Date: Nov 2019 This paper seeks to investigate the performance of solar irradiance modelling to ground based data in an urban environment. The ability to accurately model and in turn determine solar irradiance as it propagates through the atmosphere, and ... Read more
Modelling of solar photovoltaic module performance

Author: Mkasi, Hlaluku W ; Lawrence, Pratt ; Ayanna, Manjunath B ; Roro, Kittessa T Date: Nov 2021 The high demand for low carbon energy and rapidly decreasing solar panel prices have led to a surge in solar photovoltaic (PV) plants across the globe, more than at any other time since the industry began. Combined with geographic variations ... Read more
Modelling photovoltaic power output using machine Learning techniques

Author: May, Siyasanga I ; Pratt, Lawrence E ; Roro, Kittessa T ; Bokoro, P Date: Aug 2022 This work focuses on modelling the power output of multiple PV technologies installed at the outdoor test facility of the Council for Scientific and Industrial Research (CSIR) in Pretoria. Extreme Gradient Boosting (XGB) and Artificial Neural ... Read more
Multiwall carbon nanotube/nickel oxide nanocompositecoatings: Sol-gel deposition and characterization

Author: Roro, Kittessa T Date: Sep 2011 Due to their unique electronic and optical properties nanocomposite materials have wide range of applications in solar energy conversion. In this study, multiwalled carbon nanotubes (MWCNTs)/Nickel oxide (NiO) nanocomposites were successfully ... Read more
Optical properties of selectively absorbing C/NiO nanocomposite coatings

Author: Roro, Kittessa T ; Tile, N ; Forbes, A Date: Dec 2010 Nanocomposite thin films are widely used for solar thermal applications. Using carbon nanoparticle containing metal oxide as a spectrally selective solar absorber coating has grown significantly in recent years. Recently, Katumba et al. have ... Read more
Optimisation of optical absorption properties of spectrally selective C-NiO composite coatings

Author: Tile, N ; Roro, Kittessa T ; Forbes, A Date: May 2011 The demand for low cost, efficient and environmental friendly energy is increasing rapidly. Solar thermal energy is being widely investigated as a solution. Efficient thermal solar collectors require a spectrally selective material capable ... Read more
Performance monitoring of different module technologies and design configurations of PV system in South Africa

Author: Roro, Kittessa T Date: Jun 2016 Performance monitoring of different module technologies and system configurations of Photovoltaic (PV) systems in South Africa is rare, resulting in-few reports based on field results of PV systems installed and operated in South Africa. The ... Read more
Performance monitoring of different module technologies and design configurations of PV systems in South Africa

Author: Serameng, T ; Roro, Kittessa T ; Basappa Ayanna, Manjunath ; Cunden, K ; Myeni, S ; Bischof-Niemz, T ; Van Dyk, EE ; Koopman, Stephen J Date: Jun 2016 Performance monitoring of different module technologies and system configurations of Photovoltaic (PV) systems in South Africa is rare which result in few reports being published based on field results of PV systems installed and operated in ... Read more
Perovskite solar cells: The new epoch in photovoltaics

Author: Olaleru, SA ; Kirui, JK ; Wamwangi, D ; Roro, Kittessa T ; Mwakikunga, Bonex W Date: Jan 2020 Perovskite-based solar cells (PSC) is the fastest growing solar technology to date since inception in 2009. This technology has revolutionized the photovoltaic (PV) community. While it has taken 15–42 years for traditional PV technologies to ... Read more
Power output predictions of photovoltaic system using machine learning

Author: May, Siyasanga I ; Pratt, Lawrence E ; Roro, Kittessa T ; Bokoro, P Date: Nov 2021 This work focuses on developing prediction models for the power output of multiple PV technologies installed at the outdoor test facility on the Pretoria campus of the Council for Scientific and Industrial Research. Random Forest (RF) and ... Read more
Power quality analysis of a grid tied 3.3 kWp rooftop solar photovoltaic system with battery storage

Author: May, Siyasanga I ; Basappa Ayanna, Manjunath ; Pratt, Lawrence E ; Mienie, S ; Roro, Kittessa T Date: Jun 2019 This paper outlines the initial results for power quality analysis (PQA) of a single phase 3.3kWp photovoltaic (PV) system with battery storage connected to a low-voltage system at the Council for Scientific and Industrial Research (CSIR), ... Read more
Power quality analysis of low voltage grid-tied network with PV system

Author: Mnisi, MI ; Bokoro, P ; Roro, Kittessa T ; Basappa Ayanna, Manjunath ; Pratt, Lawrence E Date: Nov 2019 Power quality analysis (PQA) in power systems has become important to consider since there has been an increase in distributed energy resources installed on the existing grid, particularly in the area of renewable energy generation. South ... Read more

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