The design and performance of different types of commercial scale solar dryers with air based solar collectors are presented. Solar dryer is an effective means of food preservation particularly for small farmers in Malaysia. In solar dryer, solar energy is used as either the sole sources of the required heat or as supplemental sources. The air flow can be generated by either natural or forced convection. The heating procedure could involve the passage of preheated air through the product or by directly exposing the product to solar radiation or a combination of both. Solar dryers can be cost-effective with respect to energy savings, manufacturing labor requirements and construction materials. In addition, the solar dryers presented in this paper have very stable output temperature and higher performance. Materials for construction for these solar are also available locally