Comparison Test of Solar Ovens

The other day it was about 70 degrees warm and sunny out so I thought this would be a good time to test some solar ovens.  I had three for the test.  The first, a homemade one made with cardboard boxes and an old piece of glass.  The inside of this one was silver in color.  The second was a metal box lined with 11/2 inch Styrofoam insulation.  The inside of this box was painted black and the lid was covered in aluminum foil.  The third was a Global Sun Oven.

I place all three in the sun with a oven thermometer inside each. Over the next few hours I kept a record of the interior temperatures.

The test was started at 0945 hours with all three ovens about 70 degrees.

Time cardboard oven Metal box oven Global Sun Oven
1015 hours 150 degrees 180 degrees 240 degrees
1045 hours 175 degrees 220 degrees 280 degrees
1130 hours 180 degrees 245 degrees 325 degrees
1400 hours 180 degrees * 260 degrees 345 degrees
1500 hours 220 degrees 270 degrees 354 degrees
1600 hours ** 205 degrees 240 degrees 290 degrees

 

* I painted the inside of the cardboard oven black.

**A wind of about 10-12 miles an hour came up.

As you can see all three ovens were capable of cooking food successfully.  The Global Sun Oven was the most efficient and showed the fastest temperature increase.  This would be my preferred choice for cooking.  The oven in the metal box functioned fairly well but took longer to heat up.  More reflectors would help it.

The cardboard oven test was very interesting because it showed the dramatic change in temperature, when I painted the interior black.  Prior to this the interior had been reflective silver.  I am sure that adding reflectors to this oven would help.

Late in the day even though the temperature had risen to low eighties, the wind caused a  drop in temperature inside the ovens.

While the Global Sun Oven is a bit pricey if you can afford it I would recommend this oven over the homemade for several reasons.  It is definitely well made and I feel would outlast the others.  The rapid increase in temperature at the beginning would speed up your cooking time considerably.  This may be important during questionable weather.  It reaches higher overall cooking temperatures.

This said, I intend to keep working to improve my homemade ovens and will post more on any new developments.

The oven made from cardboard boxes prior to the interior being painted black.

This oven is 11/2 inch Styrofoam inside a metal box, The interior is painted black. The cover is plexiglass.

Global Sun Oven

Global Sun Oven

Howard

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5 Responses to Comparison Test of Solar Ovens

  1. Anonymous says:

    Do you have an experience with actually cooking anything in these?

    Can you demonstrate how to use the global solar oven to say, bake bread, or make soup, or something?

    • admin says:

      Yes, we have cooked quite a bit in ours. This summer we will start posting recipes and tips on the best way to use your solar ovens. You need to try them out for yourself, there is a learning curve.
      Howard

  2. Joe says:

    The Global Sun Oven looks very nice, but it is quite expensive.

  3. Debi says:

    The sun oven is less expensive than buying a new electric range and doesnt use any energy once you bring it home

  4. Carol says:

    If anyone has tested the Tulsi-hydrid solar oven? I would appreciate a review of that unit as well. It is a little more expensive but if supposed to be a little more substantial. Just curious if anyone has any thoughts on it.

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