Develop of a system for the mensuration of the energy efficiency of solar cells

Ivelisse Almanza-Fundora, Regla Ramona García-Fernández, Francisco García-Reina

Abstract

This document deals with the development of a system for the measurement of the solar power and the electric power generated by the solar cells of a photovoltaic panel, in order to assess energy efficiency in the conversion of light energy into electrical energy. So the first thing is to calibrate the light power emitted a tungsten lamp, taking into account the temperature of the filament and the emittance of the tungsten as a function of temperature and wavelength. The temperature of the filament is determined by measuring the resistance as a function of the voltage and amperage of the filament power and using the dependence of the resistivity of tungsten with temperature. The luminous power that emits the filament is calibrated with phototransistors and photodiodes patterns Siemens, photoelectric units (Lux, lx) and in unit of energy (W/m2). With the I-v characteristics of the cell, the Voc open circuit voltage and intensity of current in short circuit Isc determines the maximum electrical power supplied by the cell, which divided between the light output provides the efficiency rating conversion of light energy into electricity by the photovoltaic cell. Studied cells have an open circuit (Voc) of 4.6 V voltage, intensity of current in short circuit (Isc) of 87 mA and efficiency of 12.4% with irradiation of 399,6 W/m2. Key words: solar cells, energy efficiency measurements

Keywords

power luminous lot; electric power; photovoltaic panel

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