A Parvati Solar Cooker

Damn, is solar cooking easy! Put some rice in a pot, place the pot in this simple panel cooker, made with cardboard and aluminum foil, stick it out in the sun and two hours later you have lunch.

We built our "Parvati" solar cooker with plans designed by Shobha Ravindra Pardeshi that can be found here. Pardeshi, who runs an "appropriate technology" company with her husband in India has another design for a similar dish-shaped cooker here. We found both of these cookers (and many more) via the amazing Solar Cooking Archive.

For the Parvati cooker, we cut the cardboard according to the plans, and affixed the aluminum foil with spray glue. For our first pot of rice we used a black enamel pot to better absorb the heat of the sun's rays, and wrapped it in a roasting bag to increase the efficiency of the cooker. A five gallon bucket made a convenient stand and did not have to be rotated in the two hours it took to cook the rice. Longer cooking times would require re-aiming the cooker as the sun moves across the sky. Temperature in the pot quickly went over 180º F, the point at which food begins to cook. The two hour cooking time is much longer than it would take on a conventional stove, but with a solar cooker there is no danger of burning, making the process, in our opinion, easier than stove-top cooking. Consider a solar cooker a kind of low-powered crock pot for lazy and cheap people--good for things like rice, beans, soups and stews, but not good for sauteing. Just remember the oven mitts--this thing gets hot!

When the sun gets higher in the sky, as we move into summer, this cooker will reach even higher temperatures. We don't remember where we read this but some folks say that panel cookers like this one cook best when your shadow is shorter than you are which, here in Los Angeles, is right about now. We tried this cooker back in January and it performed well, but did not get above 140º F, which is not hot enough to cook.

Perhaps here around the Homegrown Evolution compound we'll get around to turning our Parvati Solar Cooker into a low rent attraction. Just add some ostriches and we'll repeat this early 20th century tourist trap in nearby Pasadena (click to biggify):

Suntracker

Brief linkage today. While Homegrown Revolution doesn't like to overdo the technology thing, we think this natural light collecting skylight device called the Suntracker One has promise. Similar in principle to the Solatube, the Suntracker, as the name implies, has an additional feature that the Solatube lacks -- it tracks the sun with a built-in electronic brain and mirrors. Both the Solatube and the Suntracker direct the light down a tube, thus replacing the heinous blocks of fluorescent fixtures that typically light most commercial buildings with a more aesthetically pleasing natural light. Solatubes are available for residential use, but the Suntracker is oriented towards larger commercial applications.

Build a Ghetto Solar Cooker

Using crap we had laying around the homestead, SurviveLA fashioned a solar cooker based on plans from Backwoods Home Magazine, the Dwell of the Ted Kaczynski set. We just substituted an old cooler for the cardboard boxes, and we finished it off by using one of Los Angeles' ubiquitous abandoned car tires as a cradle to keep the cooker oriented towards the sun. It ain't pretty but it works. In our first test we reached 160º inside the oven, but we think we can do better with some refinements such as finding a black pot with a lid.

Yesterday we cooked up a somewhat disappointing batch of "chocolate pudding" which ended up with the consistency and taste of warm cake batter. We'll test out some other recipes in the next few days, sun permitting, and keep you, our loyal readers, informed.

For more information on solar cookers check out the superb Solar Cooking Archive. You can also purchase a commercially made solar oven called the Global Sun Oven, but why do that when you can make one with cardboard, aluminum foil, and a black pot?