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The Impact of Electrical Energy Consumption on the Payback Period of a Rooftop Grid-Connected Photovoltaic System: A case Study from Vietnam

1School of Engineering and Technology, Hue University, Hue, Viet Nam

2Hanoi University of Mining and Geology, Hanoi, Viet Nam

Received: 30 Nov 2021; Revised: 21 Feb 2022; Accepted: 26 Mar 2022; Available online: 15 Apr 2022; Published: 5 May 2022.
Editor(s): H. Hadiyanto
Open Access Copyright (c) 2022 The Authors. Published by Centre of Biomass and Renewable Energy (CBIORE)
Creative Commons License This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.

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Recently, the use of small-scale grid-connected photovoltaic (GCPV) systems for households has been growing in Vietnam. The installation of a rooftop GCPV system provides many benefits to households, such as lowering monthly electricity bills, reducing absorbed heat of the building, and creating additional income by penetrating electric power to the grid. However, the technical issues of the payback period is complicated and requires a lot of considerations. The main goal of this study is to develop a computational model and investigate the effect of electrical energy consumption on the payback period of rooftop GCPV systems. A case study is used in this study to create a model of a rooftop GCPV system for households in north-central Vietnam under feed-in tariff (FiT) schemes. The results show that the investment rate and electrical energy consumption of the installed household have a strong influence on the payback period of the GCPV system. In the case of the lowest investment rate of 666.4 USD/kWp, the fastest payback period is 43 months for households consuming all of the generating energy of the GCPV system, and the longest payback period is 131 months for households that do not use electricity, implying that all of the generating energy of the GCPV system is connected and sold to the distribution grid. The research findings will actively assist in calculating the installed capacity suitable for households in order to have the most suitable payback period while also assisting policymakers in the future in setting a reasonable rate of feed-in tariff for rooftop GCPV systems

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Keywords: Payback period; grid-connected; photovoltaic; energy consumption; FiT

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  1. Abdallah, S., & Salameh, D. (2020). Technical and Economic Viability Assessment of Different Photovoltaic Grid-Connected Systems in Jordan. Proceedings of International Conference of Aerospace and Mechanical Engineering 2019 (pp. 291-303). Singapore: Springer.
  2. Ali Khan, M., Liu, H., Yang, Z., & Yuan, X. (2018). A comprehensive review on inverter topologies and control strategies for grid connected photovoltaic system. Renewable and Sustainable Energy Reviews, 94, 1120-1141.
  3. Anang, N., Azman, S. S., Muda, W. M., Dagang, A. N., & Daud, M. Z. (2021). Performance analysis of a grid-connected rooftop solar PV system in Kuala Terengganu, Malaysia. Energy and Buildings, 111182.
  4. Bloch, L., Holweger, J., Ballif, C., & Wyrsch, N. (2019). Impact of advanced electricity tariff structures on the optimal design, operation and profitability of a grid-connected PV system with energy storage. Energy Informatics, 2(1), 1-19.
  5. Branker, K., Pathak, M., & Pearce, J. (2011). A review of solar photovoltaic levelized cost of electricity. Renewable and Sustainable Energy Reviews, 15(9), 4470-4482.
  6. Bukar, A. L., & Tan, C. W. (2019). A review on stand-alone photovoltaic-wind energy system with fuel cell: System optimization and energy management strategy. Journal of cleaner production, 221, 73-88.
  7. Cuong, N. X., Hong, N. T., Tuan, D. A., & Nhu Y, D. (2021). Performance Ratio Analysis Using Experimental Combining Historical Weather Data for Grid-Connected PV Systems. In K. U. Sattler, D. C. Nguyen, N. P. Vu, B. T. Long, & H. Puta, Advances in Engineering Research and Application. ICERA 2020. Lecture Notes in Networks and Systems (Vol. 178). Springer, Cham.
  8. Do, T. N., Burke, P. J., Baldwin, K. G., & Nguyen, C. T. (2020). Underlying drivers and barriers for solar photovoltaics diffusion: The case of Vietnam. Energy Policy, 144, 111561.
  9. Eltawil, M. A., & Zhao, Z. (2010). Grid-connected photovoltaic power systems: Technical and potential problems-A review. Renewable and sustainable energy reviews, 14(1), 112-129.
  10. EVN. (2021). Decision No. 13/2020/QD-TTg of the Prime Minister officially takes effect from 22 May 2020, rooftop solar power is expected to thrive. Retrieved July 10, 2021, from /Decision-No-132020QD-TTg-of-the-Prime-Minister-officially-takes-effect-from-22-May-2020-rooftop-solar-power-is-expected-to-thrive-66-142-1853.aspx
  11. Ha, D. T., & Nguyen, H. V. (2019). Potential industrial sectors promising for commercialization of solar pv rooftop applications in Danang city. 2019 International Conference on System Science and Engineering (ICSSE) (pp. 224-228). IEEE.
  12. Huu, D., & Ngoc, V. (2021). A Two-Level Desired Load Profile Tracking Algorithm for Electric Two-Wheeler Charging Stations. Engineering, Technology & Applied Science Research, 11(6), 7814-7823.
  13. Ibrik, I. H. (2020). Techno-economic assessment of on-grid solar PV system in Palestine. Cogent Engineering, 7(1), 1727131.
  14. Kumar, N., Saha, T. K., & Dey, J. (2019). Multilevel inverter (MLI)-based stand-alone photovoltaic system: modeling, analysis, and control. IEEE Systems Journal, 14(1), 909-915.
  15. Ky, H. V., Hieu, T. T., & Hieu, N. H. (2021). Potential and Barriers to the Evolution of Rooftop Solar in Central VietNam. 2021 IEEE Madrid PowerTech (pp. 1-6) (pp. 1-6). IEEE
  16. Lan, T. T., Jirakiattikul, S., Chowdhury, M. S., Ali, D., Niem, L. D., & Techato, K. (2020). The effect of retail electricity price levels on the FI values of smart-grid rooftop solar power systems: a case study in the central highlands of Vietnam. Sustainability, 12(21), 9209.
  17. Ngo, X. C., Nguyen, T. H., Do, N. Y., Nguyen, D. M., Vo, D.-V. N., Lam, S. S., . . . Le, Q. V. (2020). Grid-Connected Photovoltaic Systems with Single-Axis Sun Tracker: Case Study for Central Vietnam. Energies, 13, 1457.
  18. Ngo, X., Nguyen, T., & Do, N. (2022). A Comprehensive Assessment of a Rooftop Grid-Connected Photovoltaic System: A Case Study for Central Vietnam. International Energy Journal, 22(1), 13-24
  19. Nguyen, D. T., Le, V. L., Ninh, V. N., & Tran, T. S. (2020). Comparing profits of investing in grid-connected rooftop pv system and deposit money in bank using dual interest rate. Journal of Science and Technology, Hanoi University of Industry, 56(2), 27-32
  20. Nguyen, T. B., & Van, P. H. (2021). Design, Simulation and Economic Analysis of A Rooftop Solar PV System in Vietnam. EAI Endorsed Transactions on Energy Web, e19
  21. Nguyen, T. M. (2019). Research on building typical load graph, application at Thua Thien Hue power company. Abstract of master's dissertation, University of Science and Technology - University of Danang
  22. Phap, V. M., Huong, N. T., Hanh, P. T., Van Duy, P., & Van Binh, D. (2020). Assessment of rooftop solar power technical potential in Hanoi city, Vietnam. Journal of Building Engineering, 32, 101528.
  23. Riva Sanseverino, E., Le Thi Thuy, H., Pham, M. H., Di Silvestre, M. L., Nguyen Quang, N., & Favuzza, S. (2020). Review of potential and actual penetration of solar power in Vietnam. Energies, 13(10), 2529.
  24. Saleheen, M. Z., Salema, A. A., Islam, S. M., Sarimuthu, C. R., & Hasan, M. Z. (2021). A target-oriented performance assessment and model development of a grid-connected solar PV (GCPV) system for a commercial building in Malaysia. Renewable Energy, 171, 371-382.
  25. Syafiq, A., Pandey, A. K., Adzman, N. N., & Abd Rahim, N. (2018). Advances in approaches and methods for self-cleaning of solar photovoltaic panels. Solar Energy, 162, 597-619.
  26. Thanh, T., Minh, P., Duong Trung, K., & Anh, T. (2021). Study on Performance of Rooftop Solar Power Generation Combined with Battery Storage at Office Building in Northeast Region, Vietnam. Sustainability, 13, 11093.
  27. Umar, N. H., Bora, B., Banerjee, C. G., & Anjum, N. (2021). Performance and economic viability of the PV system in different climatic zones of Nigeria. Sustainable Energy Technologies and Assessments, 43, 100987.
  28. Vietinbank. (2021). Interest rate. Retrieved July 10, 2021, from
  29. Vinh Thang, L., Myo Naing, Z., Xuan Cuong, N., Dinh Hieu, L., & Anatolii, S. (2021). Research of Solar Tracking Controller for PV Panel Based on Fuzzy Logic Control. 2021 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (ElConRus) (pp. 2696-2699). IEEE.
  30. Vnexpress. (2021). Rise in Vietnam electricity prices over the last 10 years. Retrieved July 10, 2021, from
  31. Vuphong. (2021). Dien mat troi. Retrieved July 10, 2021, from
  32. Yoomak, S., Patcharoen, T., & Ngaopitakkul, A. (2019). Performance and economic evaluation of solar rooftop systems in different regions of Thailand. Sustainability, 11(23), 6647.

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