A solar dryer system with multi tray rectangular section which consists of flat plate collector. In this study, temperature inside the solar box dryer and grapes moisture content with drying efficiency of grapes clusters dried in the solar box dryer have been investigated. A prototype of the dryer was constructed to specification and used in experimental drying tests. A number of experiments were conducted using potato slices, chilly and grapes. For all the test conditions, the material gets dried with system’s efficiency of 15 % to 18%.The drying time compared to open air drying was reducing by about 20% and produces the drying material on the trays are better quality. The minimum of 0.045m2 of solar collection area according to the design is required for an expected drying efficiency of 69.6% under average ambient conditions of 30°C and 76.1% relative humidity with average solar radiance of 650W/m2, the average drying efficiency was evaluated as 69.6% .
