Stand Alone System: the first commercial market for photovoltaic has been the stand-alone system. Whenever the energy supply via the grid of the electric utility was not possible, economic or desirable, PV system could be installed economically as stand-alone systems. This operational area continues to grow. There is a great potential for the implementation of stand –alone systems in developing countries, where large parts of the country often still remain without electricity supply. In a stand-alone system, the energy storage in the accumulators and the operation of numerous consumers is realized using direct current. To be able to use conventional 230 V AC appliances as well on a DC grid, stand-alone inverters are used. The objective of a stand-alone inverter is to support a variety of or different kinds of consumers/ loads. These range from various types of industrial machineries to domestic appliances to sensitive electronic devices in communications etc. Home Lighting System (HLS), Street Lighting System (SLS), Portable Lanterns, Traffic and Obstruction Lighting Systems and small community Solar Generators are some of the more popular examples of Stand-Alone SPV System. The back-bone of the Prime Minister’s much praised Village Electrification Programme in India is based on the concept of small stand-alone SPV System.