A Study on the Influence to Solar Radiation by Changing the Azimuth and Tilt of a Photovoltaic Array

In solar generation, the PV array’s azimuth is headed due south and the tilt is generally 33° in order to acquire maximum generation. However, when installed in a site where there are buildings or other facilities, the azimuth and tilt are adjusted. Yet, when the azimuth and tilt are deviated from due south and 33°, the generation quantity is decreased substantially and currently a method to estimate the decreasing proportion is unavailable. Therefore, in this thesis, an equation on the “change ratio of solar radiation due to the changes in tilt and azimuth” was deduced by utilizing empirical data on the amount of solar radiation received according to the changes of tilt and azimuth and Interpolation. By using this equation, the decreasing proportion of generating quantity due to the installation methods of PV system can be estimated, therefore, it can be usefully utilized when designing and going through feasibility studies for development of solar generation systems.