Solar Death Ray Cooking

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Solar Death Ray Cooking

Postby bennelson » Fri Apr 04, 2014 7:26 pm

Has anyone ever used a large fresnel lens for solar cooking?

These are the types of lenses used on school overhead projectors, or more importantly, old large screen projection TVs that are getting thrown away all the time.

I mounted a 3'x4' lens in a wood frame, and on a sunny day, I can melt pennies with it. No joke.

I'm wondering about using one to heat cast iron for cooking. Just focus the lens to the size of the pot or pan, instead of a penny-melting pin-point.

Anyone ever do this before? (We haven't had a sunny spring day yet since I've started wondering.)


still no idea what i'm doing...
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