On sunny days, we have a few hundred watts of power per square meter from sun light and this site has a lot of plans for collecting the power to dry, boil, and cook things.
A rule of thumb is 4 square meters of sun power is about the same as one clothing iron. They are about 2000 watts or so. That's why it's very hot in Bangkok. (That and all the cars stuck in traffic burning imported fossil fuel.)
P.S. Just found this link to Vietnam's solar cooking project. บทความเป็นภาษาไทย
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