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Using solar power to replace traditional energy has already becomed the trend of the energy policy in Taiwan. Photovoltaic systems are easy to be established in terms of renewable energy devices. The photovoltaic panels frequently used in Taiwan are mainly of single crystal and poly crystal, and the efficiency of electricity generation is between 10% and 20%. Amorphous systems are slightly lower than single crystalline ones, and the difference is approximately 2%. The amount of electricity generated by photovoltaic panels mainly depends on the solar radiation, solar illumination angles, and climate of a region, and the daily solar radiation is limited to solar illumination time. Kaohsiung was regarded as the research scope in this study, in which the photovoltaic systems, whose azimuth positions and elevation angles were adjustable, to measure the amount of electricity generated in Kaohsiung. The amount of electricity generated by photovoltaic panels will be influenced directly or indirectly by seasons or the environment, weather, and suspended particulates in the air of different regions. Therefore, actual measurement and computer analyses were employed in this study to analyze the efficiency of the electricity generation of the photovoltaic systems in Kaohsiung as well as the amount of electricity generated in different seasons and discover the optimal azimuths and elevations for photovoltaic panels in order to achieve the optimal efficiency of the electricity generation of photovoltaic systems. When photovoltaic panels are installed, it is easy for environmental factors to influence the efficiency of the electricity generation. Through the actually measurement of the amount of electricity generated in Kaohsiung, it was found that due to the changes of solar impact angles in winter and summer, the positions of panel should be either greater than 22 degrees or smaller than 15 degrees to obtain the maximum efficiency of electricity generation. However, photovoltaic systems are aimed at annual electricity generation. According to the actual measurement, the optimal amount of electricity generated was obtained from the system with the azimuth of south and the elevation between 15 degrees and 22 degrees, and the top second one was of the azimuth of southwest.
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