If you really want to stack two pelts make sure that the bottom one is of a lower rating than the one on top e.g. A 100 W pelt on top of a 25 W pelt. This works best to cool one small surface e.g. the 100 W pelt is 40 mm x 40 mm and the 25 what pelt is 10 mm x 10 mm. Get the idea the more pelt’s you stack the smaller W and physical size the next T.E.C in the stage should be. Like this have a look …
I have two agree winewood, get a stronger wattage pelt for CPU cooling.
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