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With the cost going down and encouragement from national energy policies, photovoltaic cells have become one of the most important energy resources for the future. The output power increment of photovoltaic cells is mainly based on two factors. One is decreasing the cell modular temperature and the other is increasing the cells' received solar illumination intensity. The former can be simply achieved by maintaining a proper radiating space between the modules and the ground. The later is more complicated. One needs to consider the installation of cell modules and then the maximum power output which can be derived. This paper will theoretically calculate the solar orbit and position at any time and any location. With the estimation of our model on the variation of solar illumination intensity, we can derive the output power of the solar modular cell at any tilt angle and orientation. The simulated results could be utilized in large-scale photovoltaic power generation systems when considering placement for optimal installation. It also provides a useful evaluation for the output power of photovoltaic cells mounted on roofs and outwalls of buildings.