On Wed, Sep 28, 2005 at 11:32:13PM -0400, andrew kelley wrote: > I dont know if this has occurred to anyone, but it would seem to me that if > you can generate a heat differential use a large Peltier junction with the > water flowing across the bottom and the sun beating down on the top... Why > not? No moving parts.. But thats probably aside from the matter. It did occur to me. But in standard form it's cost prohibitive. A thermoelectric generator is little more than two dissimilar metals twisted together with one end heated and the other end cooled. The question is how to do it in such a way that useful power can be extracted. BAJ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist