They concentrate sunlight, using mirrors or other types of reflective metal, into their designated cooking areas. The more concentrated the light, the more potent the concentration will be.

Some solar ovens convert the light they gather into heat. You might notice that ovens and pans generally have something black inside. This is based on the fact that the color black absorbs more light than any other color, and turns it into heat. The more efficient the pan or oven is, the faster the cooking time will be.

Some solar ovens work by trapping heat inside them. They isolate the air within the pan, separating it out from the outside air. This can be done with the use of a clear solid, such as a glass cover or even a plastic bag. This barrier allows light to enter, but once the light has turned into heat, the barrier traps the heat inside the cooker. This type of solar oven makes it possible to reach stable cooking temperatures, even during windy days outdoors.

The most efficient solar ovens utilize the three principles mentioned above, in order to effectively achieve the proper temperatures for cooking with good results and in the shortest time possible. This is especially true when the cooker will be used in a place that which has undesirable conditions.
 

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