Among Renewable energy sources (RES), a Photovoltaic system (PV) is the most clean and abundantly available form of energy. The major challenge for a PV system is efficiency. In this paper a simulation based study is presented for a 100KW photovoltaic system under normal and partial shading conditions for maximum power point tracking (MPPT) integrated with the flyback converter. Partial shading reduces the output voltage and induces multiple peaks in the P-V characteristics. The maximum power point techniques work in combination with the flyback converter to track the maximum power under normal conditions and the global peak in case of partial shading conditions. Since the maximization of load power is required, this paper focuses on the load power maximization. The flyback converter is used because of its simpler design, isolation property (flyback transformer), and higher output voltage requirement. The power transferred to the load side is studied and analysed through simulation in MATLAB and the results are shown.