Everyday Solar Cooking

We’ll show you how to build a solar oven, so you can create savory meals while cooking without fuel.

Summer’s arrived and the heat is inescapable. You don’t want to turn on the stove to make dinner, which will heat up the house even more. If you’re like me and don’t have air conditioning — or if you’re energy conscious and keep the AC low — cooking indoors can be unbearable. Instead, why not use the source of all this heat to your advantage?

Solar radiation is the most prolific source of energy on our planet. About 84 billion kilowatt-hours of light reach Earth every day — more than four times our global energy consumption. The challenge is to efficiently harness this energy. Most people settle for gathering solar energy by eating vegetables from their gardens or catching its reflection with their cameras. Trap that energy in an insulated box with some food — then you’ll really be cookin’!

The functioning principles of a solar oven are simple: concentrate, convert, contain. Sunlight — or visible light — is concentrated by several reflective surfaces to pass through a glass lid into an insulated box. A pot of food you put inside the box will absorb the light and convert it into longer-wavelength infrared energy, or heat. The insulation will inhibit the heat from escaping, and the wavelengths will be too long to pass back through the glass lid. So, they’ll bounce around and heat up your food. Ever leave your car windows closed on a bright, warm day? Then you’ll recognize the basic principles of solar cooking.

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How to Make a Solar Oven

Learn how to make a solar oven that works beautifully, is built to last, and costs less than a purchased solar cooker.

Solar ovens are simple devices that capture heat from the sun with a reflective surface that’s angled or curved towards a cooking pot. Because they can be easily made from cheap materials like scrap cardboard and tinfoil, they are widely used in areas of the world where trees and fossil fuel are scarce or expensive. Once made, they can be used to cook food and boil water in a reasonable amount of time for absolutely no cost.

There are dozens of possible designs; some angle the rays down into a small center area, while others focus the rays upward toward the underside of a pot, like a reversed magnifying glass. You can also buy portable solar ovens assembled from polished metal online—they’re great equipment for camping. But if you’re serious about integrating free fuel from the sun into your cooking, the plan below features a solar oven that works beautifully and is also built to last. Plus, you can build it for a fraction of the cost of a purchased solar cooker.

Depending on variables like location, ambient air temperature and the angle of the sun, a solar oven can reach temperatures above boiling (212° F). In ideal conditions, some types can reach 300° or more. This temperature range is high enough that you can safely cook any food, including meat. Cooking times are longer, but because the temperature is lower there’s little danger of overcooking, and the food is delicious.

Read more here.