well i have an update on this.
the 370W peltier, i finally got operational with a heatsync that is 2 FEET high :-)
and the "cold plate" which is a smaller sync, still doesnt get cold for crud.
i keep re-testing the LITTLE tiny ones, and they are very efficient.
i assume that is has more to do with the transmission of the heat, than anything.
but it could be that this 370W thing is just a piece of junk :-(
even with a 2foot heat sync, Passive is still not good enough. a slight breeze by a fan improves it instantally and proves that passive is not very efficient.
one of the small units seperated :-( the solder came undone from to much heat, right before i soldered the tip of my index finger with it (OU-$%@^*#-CH)
my Opinion at this point is that it will be efficient and more feasable with a array of SMALL units spread out. OR something that has many junctions but VERY sparsly populated across its surface.
like if it was possible 2 junctions (total) on each Sq inch of heat sync, instead of 400 junctions in 2 square inches.
if i get more available funds, i can continue to test a small spread.
untill then that is all i found out.
anything that can use the sun to move freon would be FAR more superior.