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Technical and Economic Assessment of a 450 W Autonomous Photovoltaic System with Lithium Iron Phosphate Battery Storage

Journal of Sustainable Development of Energy, Water and Environment Systems
Volume 6, Issue 1, pp 129-149
DOI: http://dx.doi.org/10.13044/j.sdewes.d5.0191
João Carriço1, João Fernandes2, Carlos Fernandes3, Paulo Branco2
1 Department of Electrical and Computer Engineering, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, Lisbon, Portugal
2 Department of Electrical and Computer Engineering, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, Lisbon, Portugal
3 Department of Electrical and Computer Engineering, Instituto de Telecomunicacoes, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1, Lisbon, Portugal

Abstract

This paper presents a study about an autonomous photovoltaic system making use of the novel Lithium Iron Phosphate as a battery pack for isolated rural houses. More particularly, this paper examines the behavior and efficiency of a low-cost isolated photovoltaic system for typical rural houses near Luena in Angola. The proposed system (solar panel, batteries, controller, and inverter) has been projected having in mind the required household daily load of 1,300 Wh and available solar irradiance. The initial batteries charging revealed to be essential to not only ensure a long battery life but using a balanced pack it was possible to achieve more stored energy. On-site, the polycrystalline solar panels used showed a daily average efficiency of 10.8%, with the total system having 75% efficiency. This result was adjusted to the average temperature in Angola. This way, it was made an extrapolation to the monthly irradiation values in Angola. The results achieved showed good energy production during almost all year except January and December, which revealed critical production values of 1,356 Wh and 1,311 Wh, respectively. These values are too close to the daily consumed energy and indicate the addition of a 2nd alternative source of energy (wind generator, diesel generator, etc.) to be explored further.

Keywords: Angola, Autonomous/Off-grid photovoltaic system, System efficiency, Lithium iron phosphate battery.

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