In the following study we make a simulation of an independent photovoltaic system connected to an (ohm - unit of electrical resistance) load which consists of the following parts: (Photovoltaic Module - Converter dc- dc - Control system to tracking the maximum power point via MATLAB & Simulink program) Taking advantage of equations of Photovoltaic Module we chart the graph and simulate curves of the Module. We also simulate the converter –type Cuk- which gives higher or lower voltage than input voltage but with reversed polarity. We also make a comparison between the two systems tracking: the first tracker is a traditional one and the second one is a system in which it uses a fuzzy logic tracker. The results of the comparison shows different capacities taking into consideration the varieties of weather conditions of regular solar radiation as well as the partial shadow. Such results showed that fuzzy logic has got more capability to harmonize with all conditions especially in cases of low solar radiation and partial shadow.