This paper is to present the Fuzzy Logic based sand –alone solar Photovoltaic (PV) system with the isolated SEPIC converter. The system is designed for 750W solar PV panel and to feed an average demand of 250 W. This system includes solar panels, MPPT (Maximum Power Point Tracking) controller, a SEPIC converter, an energy storage system and a single phase VSI (Voltage source inverter). The SEPIC converter provides a constant DC bus voltage and its duty cycle controlled by the MPPT controller which is needed to improve PV panel’s utilization efficiency. A fuzzy logic controller (FLC) is used to generate the PWM signal for the SEPIC converter to extract maximum power. Simulated using MATLAB SIMULINK, results are presented to demonstrate the performance of the MPPT controller for various load conditions.