Posts Tagged ‘sun’

Last weekend, I built a solar over and tried to make sun-dried tomatoes in them.

Needed:

  • Two cardboard boxes, one slightly smaller than the other.
  • Aluminium foil.
  • A piece of glass or clear plastic. I used clear plastic because I figured for first attempt best to learn on something that does not break easy.
  • Glue.
  • A knife.
  • Old issues of the New Times, specifically the ads for the strip joints in the back, because this is going to get hot!
  • Some other stuff that will be obvious.

Step 1: Figure out the angle you want, generally 30% in summer and 70% in winter.

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Step 2: Cut larger box at that angle desired.  Fold flaps back and cover with tin-foil, the flatter the better.  Be generous with the glue at the edges.

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Step 3: Cut smaller box at same angle. Smaller box is to fit into larger box eventually.

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Step 4: Line inner box with tin-foil.

Step 5:  Place smaller box in larger box, use old New Times to insulate the oven by placeing crumbled snewspaper sheets between the boxes.

Step 6: Place box at angle to get sun, best if box is portable.  Cover box with clear plastic.

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Step 6: Watching a pot boil in the sun takes forever.

Lessons Learned

First time around I hit about 150″, it was about 70″ degrees outside. I cooked tomatoes and tried to boil water. Water never even came close to boiling, but would have made a nice tea.

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In four hours the tomatoes were slightly dried out but not dried out for preservation.

Temperature wise it did not seem to matter if I use glass or a sheet of clear plastic.  Some videos I had watched said they had gotten the temp. to 250 degrees, so I have a lot of room for improvement.   The glass was not flush with the box, so that is where I would begin working on improvements.

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