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Yep Lewis, I think the problem is the fan direction.
I use a stock CPU cooler which blows ONTO the heatsink surface and the heat flows out through the sides and away from the peltier.
My CPU cooler / fan combo has a copper heatsink plate with an aluminium fin design with the fan PUSHING air onto the fins and plate towards the cooler box.
Also, I am using a Jaycar $14.95 48W peltier and it hasnt missed a beat so far.
Good luck, have you tried stacking two peltiers? Apparently this can work even better than one......apparently, but it would suck a lot of current....
Cheers
Chris
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