So, couple weeks ago I decided to make a solar dehydrator as a rainy day project. I went with a down draft style. I think It turned out pretty good, but I am kind of struggling with how to dial it in. I am starting out with just a black box for heat and draft. I’ve seen designs for cans, corrugation and painted mesh, but I want to get some base temperatures and drafts before I spend the time and modify it. I also have a solar powered vent fan from another project that I could add. The vent is also assisted by the shingle roof section, and I may change that. So, this is my setup before modifications. I am posting in hopes of getting some advice from people who have one themselves and have already worked things out.

I will repost the tweaked final design