This paper presents a new method for the design and operation of photovoltaic power plants connected to the network anywhere in the country. Using an appropriate module and inverter can power while increasing efficiency and ideal use of solar energy potential, prevent power dissipation and system cost in different parts of the Draft .also prevent the loss of power in the shadow of modules on each other or the other computing takes place. The main characteristics of the panel and inverter design that is fit and homogeneity. HelioScope Software due to weather conditions and the geometry of the selection panel, the best way to offer the appropriate inverter type of wiring. SketchUp Software suitable guideline for evaluating the shadows during the year. Acoustic station Mehrabad NASA weather data and virtual stations can be used with high accuracy. Plant Mehrabad weather station data can yield% annual 7/78 and 3/735 MW due to the virtual station NASA 8/79% yield equivalent to 7/724 MW power generation have. The highest temperature and the lowest power dissipation in the wiring and inverter are mismatched.