Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Experimental appraisal of long-term degradation of PV modules in Rio de Janeiro, Brazil
Submission Author:
Felix do Rêgo Barros , RJ
Co-Authors:
Felix do Rêgo Barros, Ebenézer Viana, Manoel Antônio da Fonseca Costa Filho
Presenter: Manoel Antônio da Fonseca Costa Filho
doi://10.26678/ABCM.COBEM2023.COB2023-0097
Abstract
. The State University of Rio de Janeiro has a photovoltaic installation located in the São Cristóvão neighborhood in Rio de Janeiro city. It has continuously operated in the off-grid mode since 2007. The fifteen-polycrystalline silicon modules BP MSX120 are north-oriented with an inclination of 32°, above the local latitude of 22°30’, resulting in a higher energy production in the winter, the driest season, added by less PV module heating. This study focuses on the DC circuit of seven modules, isolated to feed a purely resistive load. This paper experimentally evaluates the impact of the climatic conditions on the degradation of these modules, expressed as power loss at the maximum power point at Standard Test Conditions, after 16 years of operation. A supervisory developed in LabView has continuously recorded in a minute base, the incident global solar radiation, atmospheric relative humidity, ambient and shaded surface PV module temperature, individual and total module currents, and array voltage, as all modules are connected in parallel. Literature reported that hot and humid climates promote the highest PV degradation rates, pronounced in those manufactured until 2010. In-site previous studies found annual degradation rates up to 2.5%. Soiling was included in degradation since there is no active cleaning here, as in almost Brazilian rooftop PV installations. Natural random cleaning by the rain and wind limits dirt deposition in high-rainfall sites. Overall degradation has overcome the manufacturer’s warranty of power loss of up to 20% after 20 years of operation. This paper ends highlighting the need to use real yearly degradation rates in feasibility studies for PV generation, and the low availability in the literature of long-term experimental appraisal of PV module performance in hot and humid climates. w
Keywords
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