Solar panels are installed on fixed-tilt racks because of easy construction at various capability of installation locations. They are installed at roof, wall, ground surface, slope and so on. The amount of light received at fixed panels is affected by shade, seasonal variation of solar orbit, the latitude and the clear sky rate of the installation location and the area. In this study to increase the amount of light received at fixed solar panels, optimization method is applied to determine the optimization parameters relating the installation configuration and the inclined angle of panels. Several optimization examples to demonstrate the effectiveness of the optimum design of the solar panel configuration are shown in this paper.