Performance Metrics of a Grid Connected Photovoltaic Plant: A Practical Case of the 1.3MW Phakalane Plant in Gaborone, Botswana


  • Lista Gobodi University of Botswana,Faculty of Engineering & Technology,Department of Electrical & Electronic EngineeringGaborone, Botswana
  • Ditiro Setlhaolo University of Botswana,Faculty of Engineering & Technology,Department of Electrical & Electronic EngineeringGaborone, Botswana
  • Japhet D. Sakala University of Botswana,Faculty of Engineering & Technology,Department of Electrical & Electronic EngineeringGaborone, Botswana


Photovoltaic (PV) plant, Grid connected, Performance Ratio (PR), Capacity utilization factor (CUF), Technical Availability, Mean Time Before Failure (MTBF), Mean Time To Repair (MTTR)


The performance of a solar photovoltaic plant can be analyzed using various key performance indicators such as performance ratio, capacity utilization factor, system efficiency, system availability etc. This paper is a presentation of the performance of a 1.3MW grid connected photovoltaic system in Gaborone, Botswana. The methodology utilizes the energy generated and supplied to the grid from January to December 2020 to compute the quality ratios: performance ratio, capacity utilization factor and the technical availability of the plant. During the period of study, the grid connected plant injected 2,245,505.00 kWh of energy to the national grid with the final yield, reference yield, performance ratio and the capacity utilization factor of: 1 724 peak sun hours; 2 196 peak sun hours; 78.5%; and 19.66% respectively. Comparing it with other plants this system’s performance is very good. However, the technical availability of the plant was only 57.4% with Mean Time Before Failure (MTBF) of 129 hours and Mean Time To Repair (MTTR) of 96 hours. Therefore, this paper reveals the impact of grid interference and prolonged downtime on the performance of grid tied PV systems. The study gives insight to engineers, researchers, decision makers and other stakeholders in this field so that focus must be directed to ensure the availability of such power plants especially in Africa where most grids experience frequent tripping.


V., Sampath Kumar, Jagdish Prasad, and Ravi Samikannu. 2018. “Barriers to Implementation of Smart Grids and Virtual Power Plant in Sub-Saharan Region—Focus Botswana.” Energy Reports 4:119–28. doi: 10.1016/j.egyr.2018.02.001.

Integrated Resource Plan (IRP) for Botswana, 2020, available

Taziwa, Raymond Tichaona, Edson L. Meyer, Carine L. Buma, and Raymond Taziwa. n.d. Performance parameters of an off-grid building integrated photovoltaic system in south Africa,

Jahn, Ulrike, Wolfgang Nasse, Solar Engineering Decker, and Mack Gmbh. 2003. “Grid-Connected PV Systems in IEA Countries.” Database (May):3–6.

Quansah, David A., Muyiwa S. Adaramola, and Lena D. Mensah. 2016. “Solar Photovoltaics in Sub-Saharan Africa - Addressing Barriers, Unlocking Potential.” Energy Procedia 106:97–110. doi: 10.1016/j.egypro.2016.12.108.

HemanthBabu, N., Sujata Shivashimpiger, N. Samanvita, and V. M. Parthasarathy. 2019. “Performance Ratio and Loss Analysis for 20MW Grid Connected Solar PV System - Case Study.” International Journal of Engineering and Advanced Technology 8(2):20–25.

Kumar, P. Rajesh, D. Koteswara Raju, Rajib Kumar Kar, and V. Vimala Devi. 2017. “Performance Metrics of Grid Connected Solar PV Power Plant: A Practical Case Study.” Journal of Green Engineering 7(1):99–128. doi: 10.13052/jge1904-4720.7126.

Nwanya, S. C., J. I. Udofia, and O. O. Ajayi. 2017. “Optimization of Machine Downtime in the Plastic Manufacturing.” Cogent Engineering 4(1). doi: 10.1080/23311916.2017.1335444.

Bertling, Lina, Ron Allan, and Roland Eriksson. 2005. “A Reliability-Centred Asset Maintenance Method for Assessing the Impact of Maintenance in Power Distribution Systems.” 2005 IEEE Power Engineering Society General Meeting 3:2649. doi: 10.1109/pes.2005.1489068.

Benda, Vít?zslav, and Ladislava ?erná. 2020. “PV Cells and Modules – State of the Art, Limits and Trends.” Heliyon 6(12). doi: 10.1016/j.heliyon.2020.e05666.

Ibrik, Imad H. 2020. “Techno-Economic Assessment of on-Grid Solar PV System in Palestine.” Cogent Engineering 7(1). doi: 10.1080/23311916.2020.1727131.

Baseer, M. A., R. P. Praveen, M. Zubair, A. Galal Abo Khalil, and Ibrahim Al Saduni. 2020. “Performance and Optimization of Commercial Solar PV and PTC Plants.” International Journal of Recent Technology and Engineering 8(5):1703–14. doi: 10.35940/ijrte.e6247.018520.

Cherfa, F., A. Hadj Arab, R. Oussaid, K. Abdeladim, and S. Bouchakour. 2015. “Performance Analysis of the Mini-Grid Connected Photovoltaic System at Algiers.” Energy Procedia 83:226–36. doi: 10.1016/j.egypro.2015.12.177.

Nordmann, T., Clavadetscher, L., & Jahn, U. (2007, September). PV system performance and cost analysis, a report by IEA PVPS Task 2. In Proceedings of the 22nd European Photovoltaics Solar Energy Conference, Milano.

Li, Chong. 2018. “Comparative Performance Analysis of Grid-Connected PV Power Systems with Different PV Technologies in the Hot Summer and Cold Winter Zone.” International Journal of Photoenergy 2018. doi: 10.1155/2018/8307563.

Tiwari, Bhoj Raj, Nawraj Bhattarai, and Ajay Kumar Jha. 2017. “Performance Analysis of a 100 KWp Grid Connected Solar Photovoltaic Power Plant in Kharipati, Bhaktapur, Nepal.” 8914(January):629–36.

Prakhya, Rajesh Kumar, and Ch. Lokeshwar Reddy. 2018. “Estimating the Performance Ratio and Degradation Factor of Rooftop Solar PV Plant.” CVR Journal of Science & Technology 14(01):32–37. doi: 10.32377/cvrjst1407.

Kumar, Nallapaneni Manoj, Srikar Dasari, and Jagathpally Bhagwan Reddy. 2018a. “Availability Factor of a PV Power Plant: Evaluation Based on Generation and Inverter Running Periods.” Pp. 71–77 in Energy Procedia. Vol. 147. Elsevier Ltd.

Mhundwa, Russel, Michael Simon, and Joel Nana Yongoua. 2020. “The Electrical Energy Impact of Small-Scale Onsite Generation: A Case Study of a 75 KWp Grid-Tied PV System.” Journal of Energy in Southern Africa 31(4):1–15. doi: 10.17159/2413-3051/2020/v31i4a8808.

Botswana Energy National Policy, April 2021, Available

Elhadj Sidi, Cheikh El Banany, Mamadou Lamine Ndiaye, Menny El Bah, Abdoulkarim Mbodji, Ababacar Ndiaye, and Papa Alioune Ndiaye. 2016. “Performance Analysis of the First Large-Scale (15 MWp) Grid-Connected Photovoltaic Plant in Mauritania.” Energy Conversion and Management 119(November 2020):411–21. doi: 10.1016/j.enconman.2016.04.070.

Spertino, Filippo, Elio Chiodo, Alessandro Ciocia, Gabriele Malgaroli, and Alessandro Ratclif. 2021. “Maintenance Activity, Reliability, Availability, and Related Energy Losses in Ten Operating Photovoltaic Systems up to 1.8 MW.” IEEE Transactions on Industry Applications 57(1):83–93. doi: 10.1109/TIA.2020.3031547.

Mooiman, M. B., & Edwin, M. (2016). A multidisciplinary examination of solar power in Botswana. In Gaborone, Botswana: SASEI International Renewable Conference.

Botswana Power Corporation, 1.3MW Phakalane PV Plant Data, 2022 2012. “Sunrise and Sunset in Victoria.” 2012(May/22).

Adebiyi, Abayomi A., Evans E. Ojo, and Innocent E. Davidson. 2020. “Performance Evaluation of a Grid-Tied PV System in the East Coast of South Africa.” 2020 IEEE PES/IAS PowerAfrica, PowerAfrica 2020. doi: 10.1109/PowerAfrica49420.2020.9219905.

Ntsaluba, Sula B. K., and Isaac Dlamini. 2021. “Performance Evaluation and Comparison of a University Based Roof Top Grid- Connected PV System.” International Conference on Electrical, Computer, and Energy Technologies, ICECET 2021 (December):9–10. doi: 10.1109/ICECET52533.2021.9698436.

Kumar, Nallapaneni Manoj, Srikar Dasari, and Jagathpally Bhagwan Reddy. 2018b. “Availability Factor of a PV Power Plant: Evaluation Based on Generation and Inverter Running Periods.” Energy Procedia 147(September):71–77. doi: 10.1016/j.egypro.2018.07.035.

Creutzig, Felix S., and Daniel M. Kammen. 2009. “The Post-Copenhagen Roadmap Towards Sustainability: Differentiated Geographic Approaches, Integrated Over Goals.” Innovations: Technology, Governance, Globalization 4(4):301–21. doi: 10.1162/itgg.2009.4.4.301.

Ch, Haeberlin. 2003. “Berner Fachhochschule , Hochschule Für Technik Und Informatik ( HTI ).” 19–26.

Med YAHYA, Ahmed, Abdel Kader MAHMOUD, Daha Hassan DAHER, Léon Gaillard, Christophe Menezo, and Adel Mellit. 2021. “Performance Analysis of a 48kWp Grid-Connected Photovoltaic Plant in the Sahelian Climate Conditions of Nouakchott, Mauritania.” Preprints (February). doi: 10.20944/preprints202102.0275.v1.

Ulrich, Richard. 2006. “Reliability Considerations.” Advanced Electronic Packaging 651–89. doi:10.1109/9780471754503.ch16




How to Cite

Lista Gobodi, Ditiro Setlhaolo, & Japhet D. Sakala. (2024). Performance Metrics of a Grid Connected Photovoltaic Plant: A Practical Case of the 1.3MW Phakalane Plant in Gaborone, Botswana. American Scientific Research Journal for Engineering, Technology, and Sciences, 98(1), 71–87. Retrieved from