Jeffrey Yago gives instructions in an article in “Backwoods Home Magazine” for September/October 2013 (Issue #143). An excerpt is below, including a link where you can read the entire article.
By the way, this is not a solar oven. But if a solar powered dehydrator is what you want, read on.
Build a passive-solar
By Jeffrey Yago, P.E., CEM
Humans have been drying fruits, herbs, nuts, vegetables, meats, and fish using just the sun for thousands of years. Early Egyptians used wooden racks to sun-dry thinly-sliced strips of meat and fish. As early as the 1700s, people were improving the dehydration process by constructing drying enclosures built over slow-burning fires. By the early 1900s, commercial dehydrators became available that included powered fans and small electric heaters similar to the designs in use today.
This article describes how you can build your own solar-powered food dehydrator, but I will not be going into detail on how to actually prepare and season foods for dehydration. There are numerous reference materials, recipes, and detailed instructions on the dehydration process, which are easy to find in other BHM articles and on the Internet.
Read the whole article here:
Excerpt used with permission of Backwoods Home Magazine.