Nomads Who Capture the Sun

Some say that solar cookers and solar panels pull the sun down from the sky and that this can cause evil in the world. Others say that humans should use the sun, as plants do, to live and grow without polluting the sky gods’ kingdom with black smoke.

The SolSource 3-in-1 was born from this second desire. It harnesses the suns’ energy for cooking, heating, and electricity generation without pulling it from the sky.

The initial concept for the SolSource solar cooker platform was born out of a memory relayed by a Ladakhi nomad.

“The colors of our land are changing. The land was once a vast expanse of green grasses dotted with black tents. Now it is a desert of yellow and white.

When I was a child, we would move our black yak tents from place to place and only leave a small pile of white ashes on the ground where we had been. Now, my children think it is better to live in a white synthetic tent and leave the ground covered with yellow plastic. They think that everything from the outside is better than what we make even when it doesn’t work as well…like the synthetic tents that let in all the cold air and have to be replaced every two years.”

The Himalayan terrain is one of the harshest on Earth and its inhabitants have displayed incredible ingenuity in adapting to that environment, sheltered by their woven yak-hair tents which last for 20 years and whose fibers swell to keep out the rain.

The design of the SolSource Cooker through close collaboration among villagers, students, and development workers, is an attempt to continue a traditional line of local innovation. It merges design principles of traditional nomadic tents with those of synthetic high-altitude hiking tents to produce a light-weight, portable, and weather hardy solar concentrator that enables the maximum range of cooking styles including stir-frying.

Field tests have yielded 28% efficiency compared to 20% efficiency of butterfly cookers tested simultaneously. The most recent iteration of the SolSource solar cooker reduced its weight to 6 kg. Although staking down the bamboo legs gives the device excellent stability against the wind, many villagers thought that it was too light and were worried that it would not last long under windy conditions. We plan to revert to several elements of our previous prototype design which bring the weight of the device to 8 kg.

The other element that we changed during our recent tests was the design of our thermoelectric component. The feedback was that the previous prototype which was slightly less efficient but which allowed people to boil water while also generating electricity was highly preferred by villagers.

We have partnered with four communities to begin local manufacture and income generation of the SolSource 3-in-1 over the next year.

>Pictures are coming soon when I have a good internet connection...

One Earth Designs (OED) was founded in 2007 by Catlin Powers and Scot Frank ( OED website; OED blog; OED facebook page; Twitter @OneEarthDesigns). Catlin will post on Mondays and Wednesdays. You can also find her on Twitter @CatlinPowers.