I built a solar dehydrator that uses the sun to dehydrate food from our garden and will even make all kinds of jerky on sunny days. It has a small computer fan powered by a small 12vdc solar panel that is used to circulate the air to effect dehydration. I used a fine no-see-um netting to block bugs etc... from entering the vent holes.
Here is the video of it being made:
Here is a video of it being used in our rear field garden: