Assessing the Reliability and Cost in Off Grid Photovoltaic system(case study in Kermanshah)

Amount of daily sunshine hours is one of factors that influence number of solar panel in an Off Grid Photovoltaic System. With the different months, the amount of daily sunshine hours vary and in summer amount of daily sunshine hours is more than winter. When designing a system and calculation number of system components, amount of daily sunshine is used. But in the winter due to below-average sunshine hours, loss of power and Due to above-average sunshine hours in summer, there is an extra electrical capacity.
In this paper for Kermanshah daily sunshine hours in the 12 months of the year and the average daily sunshine hours during the year, 13 plans are presented for the design of photovoltaic systems and based on reliability and cost of power system, Suitable plans is selected.
For economic evaluation life cycle cost method in 30 years due to 18% discount is used. In this paper prices and costs is based on Iranian market in 2012 and is in dollar. The results show that the June and July plans for photovoltaic systems, are less expensive and less reliable access to electricity, but December has the highest cost and highest reliability