A few simple structures are formed by incorporating high gain cells to the conventional boost converter. The cells such as passive switched inductors, switched capacitor, switched inductor/capacitors are inserted in the traditional boost converter to boost up the voltage gain of the converter. The suggested high gain cells can be added to any conventional topologies like buck-boost, sepic, cuk, zeta, luo converters to enhance the gain and other key features of the converters. The operating principle and theoretical analysis of all the proposed converters are discussed. Design of good feedback controller is essential for fast dynamic response and good regulation. Hence, the mathematical model of the topologies is presented. Finally, the step-up topologies are compared to highlights their significant features. In addition to that, Life cycle analysis of the Photovoltaic (PV) system is studied in this paper. The results from the theoretical study are validated by simulating the circuit with MATLAB software. Simulation model is developed for 500 W, 200 V which is most suitable for rooftop PV application