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Seasonal and temporal unbalanced demands of electric power are increasing year after year. While an even demand from the load must be maintained in order for the development of a typical solar power generation system for an ordinary usage in the near future, the most important aspect is to develop a low-cost system. fn this paper, the load pattern for a factory is chosen as the subject of the research, which has a lot of advantageous factor> such as day-load and stability of the day to day load pattern. The two solar power generation systems which are shown below are investigated: one is connected with commercial power source and the other has equipment for charging the battery using low-cost night electric power. Both systems are simulated using meteorological data and are investigated not only from the energy flow in the systems but also from an economic viewpoint based on current constructive cost. In addition, the influence of the arrangement of holiday load patterns on the effective energy generated by photovoltaic panels are also researched.