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Total or partial shading conditions have a significant impact rate on the capability of delivering energy, in addition to the on-site environmental condition which effects the PV module output production. Generally, the shading effect is caused by the PV generator inter-row configurations, cloudy perturbations, the buildings and trees. In this paper, an investigation study has been carried out by testing different PV module types (mono-crystalline, polycrystalline) under different shading rates. The obtained IV characteristics have been treated through the Bishop model where the power losses occurred on the PV module output, have been evaluated. The measured and estimated I-V characteristic plots illustrated a good agreement and the used model provides an accurate power losses prediction caused by different shading effects, even in desert areas. (C) 2017 The Authors. Published by Elsevier Ltd.