How to Build a Solar Dehydrator

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How to Build a Solar Dehydrator

Now that it’s summer, my garden is going full throttle and I’m going to need to start putting some things by, as my Grandmother would say. You can only can and freeze so much, so the next thing to do would be to dehydrate. It saves money, time and space and your harvest can be used all year instead of just when it’s ready.

What can you dehydrate?

Actually, most things can be dehydrated. It involves removing the moisture from food items to preserve them. Here’s a list of things that can be dehydrated:

  • Herbs – All herbs can be dehydrated and saved for later use. I have dehydrated my mints (see more on mints here), basil, rosemary and more.
  • Wildcrafted herbs – Plantain, cleavers, clover and yarrow are some of my favorites right now.
  • Fruits – Blueberries will be ready soon, as will raspberries and blackberries. Try peaches and apples later in the season. Brush with a lemon juice or a salt water solution to prevent browning during the dehydration process.
  • Vegetables – I dehydrate carrots, celery and even potatoes for soups and stews. This year I’ll be doing sweet potatoes and sunchokes.
  • Anything else – I got a great deal on coconuts one year, and into the dehydrator they went. I also made fruit leather with peaches in the dehydrator not too long ago (get a great recipe for fruit leather here).

And you don’t need to go buy a dehydrator – you can make one yourself without a lot of trouble! (If you do want to buy one, we recommend this one, it’s awesome!)

Building a solar dehydrator

This is so simple that it can be done in an afternoon.

You will need…

  • A piece of plywood about 3 feet long and a foot wide
  • Two pieces of 2×4 as long as your plywood
  • Two more pieces of 2×4 as wide as your plywood
  • A piece of plexiglass to fit on top of your finished box (find large sheets here)
  • Matte black paint
  • Nails or screws
  • A drill bit to make really large holes in the 2x4s
  • A table
  • A box as wide as your plywood – can be wood or cardboard
  • Screen to fit on top of the box

Assembling the dehydrator

  1. Take your 2x4s and screw them along the edges of the plywood to make a shallow box.
  2. With the large drill bit, make 6 or 7 holes in one of the short ends. These will be vent holes.
  3. Paint all of this with the black paint.
  4. After the paint is dry, attach the plexiglass to the top of the box. (This is your air warming unit.)
  5. Prop up the air warming unit on the table with the vent holes on the higher end. Set the box on the table next to the air warming unit, with an open end up. Vent your air warmer into your box so the warm air will flow into the lower side of the box. It will look like a slide. This whole set-up should be facing full sun. (See the colored image on this page to get a better idea of what it will look like.)

Using your solar dehydrator

Place anything you want to dry inside. Use shelves if you need more space. Place the screen over this and wait. If you position your dehydrator in full sun facing east or south in the morning, you could have dry material by evening. Western sun will dry material partially and will finish drying in the next day or so. Thick items, such as burdock root or comfrey root will take longer to dry, possibly a week.


Some directions suggest lining up soda cans on the inside and painting them black as well. You’ll need some space at the bottom for air flow. I’ve never used cans and my dehydrator works just fine. Most of my herbs take only a day or two to dry. You can get fancy and make shelves inside the box to put screens on. Window screens work great, but you can make your own.

This dehydrator can also be made with a cardboard box. Use the same directions for assembling, but prop your plexiglass on top of the box instead of nailing it. Cardboard will work just as well, but it’s not waterproof. Take it in if rain threatens. I’ve also used aluminum foil, but painting it black will absorb more heat. Matte paint is better because it absorbs heat where glossy paint reflects it.

Don’t be afraid to experiment with your foods. I’ve dipped my orange slices in a simple syrup and dehydrated them that way. It makes a nice crunchy, sweet snack. I’ve also made granola in the dehydrator, but the molasses I used remained sticky, (which might have been remedied by leaving it in longer.) Once I made a mix of dehydrated corn, carrots, onions, celery, potatoes and peas and kept it in a jar for winter. When I was ready to use it, I browned some meat (I like chuck roast) and added water. I then dumped the veggies in and simmered for a few hours. I seasoned with salt and pepper and allowed it to thicken a bit. It was one of the best beef stews I’ve ever had! Dehydrating also makes food lighter in weight to take camping (see some camping recipes here).

Do you dehydrate? Have you ever tried a solar dehydrator?

Share in the comments section below!


About Debra Maslowski

Debra is a master gardener, a certified herbalist, a natural living instructor, and more. She taught Matt and Betsy how to make soap so they decided to bring her on as a staff writer! Debra recently started an organic herb farm in the mountains of Western North Carolina. You can even purchase her handmade products on Amazon!

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    • Debra Maslowski says

      I don’t right now, Pat. I lost the one I had in a storm last year. We had sooo much rain for a while and mine ended up in a pond! I’m building another one right now, along with a cardboard one, so hopefully soon I’ll have photos to share.

  1. Kimmi Chaney says

    We dehydrate just about everything but some of our favorites are:
    Asparagus, pineapple, mango, any fruit really, and Greek yogurt. I don’t know if you would be able to do the yogurt in a solar dehydrator thought. The process may take too long and the yogurt might spoil.

    • Debra Maslowski says

      I’ve never tried yogurt in a dehydrator, but I’ve seen recipes. I might just give it a shot. And I never thought about asparagus, Kimmi, so thanks for that!

  2. Jennifer Portem says

    Great idea! You guys are mindreaders, this is exactly just what I need! 😀 Is there a specific time for drying or any proper way of saying that this or that is dry enough? How long do solar-hydrated food last? Thanks again! 🙂

    • Debra Maslowski says

      Hi Jennifer! I keep most of my dehydrated foods all winter, or at least until I need them. If all or at least most of the moisture is removed, they could last a few year. I try to use mine up within a year because by that time, I usually have more to dehydrate.