Recently, with the increase in regulations on self-power generation of energy in buildings, building-integrated photovoltaic systems (BIPV), that is, solar power on the outer walls of buildings, are also on the rise. Thus, considering the shadow of a building, the power generation of an elevated solar cell module according to differences in location, shadow, and reflectance (albedo) must be analyzed. In this study, we used a ray-tracing method and a three-dimensional (3D) optical design simulation program. For ray-tracing simulation, we produced sophisticated structures and provided optical properties, and a correction process for the surface temperature was conducted using a temperature correction formula. In addition, the characteristics and accuracy of the simulation were compared using Solar Pro data. Finally, in this study, we report the amount of power generated according to differences in location, shade, and reflectance (albedo).