The world is facing imminent danger from depletion of non-renewable energy resources and accelerated rate of global warming. With the rapid urbanization and industrialization requiring technologies which are adding to the woes of global climatic and human concern, a step has to be taken to impede the upcoming threats. The automobile industry, contributing a major share towards pollution, conventional frontiers need to be broken and efficient energy resources need to be discovered to bring a new era of automobiles. My work,Design and Analysis of PHEV's, is a stepping stone to achieve that goal. It contains a detailed process from development of a prototype HEV on a RC car to analysis of various parameters to ensure the sustainability while they replace the conventional fuel driven automobiles.