THERMOGRAPHIC ANALYSIS OF PHOTOVOLTAIC MODULES WITH BASE-N SOLAR CELLS WITH DIFFERENT MESHES ON THE BACK SURFACE
DOI:
https://doi.org/10.59627/cbens.2012.1850Keywords:
Photovoltaic Modules, n-Base Solar Cells, Thermographic AnalysisAbstract
Thermography has been used for the evaluation of photovoltaic modules and systems. The aim of this paper is to analyze by thermography photovoltaic modules with cells manufactured in n-type silicon wafers with emitter formed by boron diffusion and with different metal grid on the back surface. Solar cells with rear area covered with metal ranging from 9% to 53% were manufactured, characterized and sorted. After this step eight PV modules were manufactured. All the modules presented some cells with higher temperature (hot spots) and this result was not related to the metallized area on the back surface of the solar cells. The I-V curve of photovoltaic modules was measured under standard conditions and we found that the reduction of the metal grid area on the rear surface of the solar cells does not affect the fill factor of the photovoltaic modules. The temperature difference between the solar cells of each photovoltaic module ranged from 9 ° C to 18 ° C, when the modules were short-circuited and the solar irradiance was of 500 W/m2 to 700 W/m2 . In the region of the electrical connection box (junction box), the temperature of the solar cell is approximately 5 ° C higher than that of the other solar cells, due to the reduction of heat exchange by convection. The temperature difference between the solar cells obtained by the thermographic technique in the front and back face of the modules was similar. We also found that a high value of the incoming solar radiation is not needed to identify cells with the highest temperature.
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