[58]

Today’s world needed uninterrupted qualitative electrical power with high reliability. Electrical energy that is derived from fossil fuels produces high pollution one side and on the other side electrical energy demand is continuously increasing. To tackle this typical twin problem alternative resources such as wind, solar and bio mass energy sources are to be preferred. In order to reduce the utilization of fossil fuels that is to save the fossil fuel reserves {coal, diesel e.t.c} it is very essential to see towards the above mentioned alternative sources. Solar/PV systems are one of the most promising methods of electrical power generation. PV- grid connected systems are worldwide installed because it allows consumer to reduce energy consumption from the electricity grid and to feed the additional energy back into the grid. A realistic cost benefit analysis requires evaluation models that can recognize the highly erratic nature of solar energy source and it’s interdependence of random variables inherent in them. The probabilistic reliability evaluation of solar photo voltaic systems is required for gaining a better insight in component sizes and location needed before they are built. Proper survey of solar radiation sources study may be carried over. In this paper a case study of a roof top solar power plant ( 100 KW) at “Vidyut soudha, Somajiguda, Hyderabad, Telangana ” is considered for reliability assessment