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This paper presents on the one hand, an evaluation of the impact of partial shading on the performance parameters of two photovoltaic modules respectively in poly and mono. The current-voltage characteristic (I-V), the short-circuit current (Icc), the open-circuit voltage (Vco) and the maximum power (Pmax) were studied. In this work, the measurements were carried out under the standard conditions (STC) in order to make a comparative study of the performance parameters as a function of the illuminated surfaces and the transmittance of the partial shading of two technologies (mono and poly). The results have shown that the power losses under partial shading are much greater for silicon-monocrystalline than for polycrystalline for a transmittance of [0.2 to 1.2] and smaller for [0 to 0.2]. However, the open circuit voltage is not affected for both technologies. On the other hand, the reduction of the short-circuit current is much more important for the polycrystalline.       Key words: Photovoltaic module, photovoltaic (PV) module performance parameter, shading.

Evaluation of the impact of partial shading and its transmittance on the performance of crystalline silicon photovoltaic modules