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The efficiency a solar cell system is mainly affected by the solar incident angle on the photovoltaic panels. The orientation and slope of a photovoltaic panel relative to sun's position, then, determine the solar incident angle. In designing and installing a solar cell system, the solar energy on the tilted photovoltaic panel should be accurately calculated. In oder to maximize the incident beam radiation, the tilt angle of a photovoltaic panel must be controlled in association with the altitude angle and azimuth angle of the sun. this study discusses on the optimum size and tilt angle of a louver-type photovoltaic panels which can be installed on the wall of existing buildings.