A plenty of recently established small Hungarian farms need new small scale agricultural equipment to expand the productivity and to fulfil the increasing quality control demand. As a response for this demand a modular solar dryer was developed and built which can help the quality saving with renewable energy. In this paper the features and the operation of the dryer is presented first. The effect of the solar air collector module for the physical properties of drying air was studied along with the calculation of efficiency, too. The mass flow of the drying air through the system is one of the most important factor concerning to the whole process, for that reason the velocity distribution is also presented. Finally some measuring results are presented for drying of apple.