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Investigation of the Effect of Temperature Coefficients on Mono-Crystalline Silicon PV Module Installed in Kumasi, Ghana

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Document pages: 15 pages

Abstract: The performance of solar PV modules is significantly affected bytemperature. This paper focuses on the determination of the effect of temperatureon a commercial mono-crystalline silicon PV module whose temperature coefficientswere not provided by the manufacturer for installation in Kumasi, Ghana, Sub-Saharan Africa (SSA) ambient. In order to determine the effect oftemperature on the output characteristics of the module, the temperaturecoefficients of current, voltage and power were determined. First of all, themodule was cooled to a temperature between 10°C - 15°C in a cooling chamber, covered with cardboard paperbefore the outdoor electrical tests using Daystar I-V Curve tracer. The resultsshow that as temperature increases, irradiance decreases significantly leadingto a decrease in output power (Pmax). The open circuit voltage (Voc) also decreases, whilst shortcircuit current (Isc)increases slightly. The temperature coefficients were obtained from the slopesof the plots of temperature against Pmax, Isc and Voc. The slopes were used todetermine how the respective output characteristics are affected as the module’stemperature rises. The temperature coefficients for power, voltage and currentwere obtained from the slopes of the graphs using the IVPC software and foundto be &#87220.313 W °C, &#87220.11 V °C and 0.004 A °C respectively. The results indicate that outputpower is a decreasing function of temperature (that is power decreases whentemperature increases). This information will be useful to system developers,manufacturers and investors seeking toprocure PV modules for installation in Kumasi, Ghana. The temperaturecoefficients of commercial PV modules could be independently verifiedusing the technique employed in this study. Future work will focus on thelong-term effect of temperature on the electrical performance characteristics.

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