The purpose of this work is to study the influence of the shading rate on the different performances of a photovoltaic device. An experimental study of a special boost called MCB (Magnetically Coupled Boost) developed by the research team at the LMOPS Laboratory. The influence of shading on boost performance is discussed through this phase of experimentation system and reduce the cost of the network and the cost of maintenance. The experimental procedure is based on the measurement of currents and voltages on the DC bus. Based on the shaded area (number of shaded cells) of the module of different shading configurations with a constant illumination