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Bren,
I have a couple of TEC1-1270240 units, 40 mm square, supposed to have a Dt of 70 deg[URL="http://www.thermonamic.com/TEC1-12702-English.pdf"]
Connected to my 3 amp 0 to 30 v supply I find that Dt maxes at around 20 deg with a 50 mm x 50 mm x 1.5 mm plate for a load with a small HSF. Hot side temp does not go over 30 deg ( ambient 22 deg. Cold side temp drops to temp in about 4 min.
Temp 3.2 deg @ 9 V 1.88 A
Temp 2.4 deg @10 v 2.18 A
Temp 2.4 deg @ 11 v 2.3 A
Temp 2.5 deg @ 12 V 2.48 A
As you can see with only a small load the performance is a mile away from the stated performance and increasing voltage beyond 10 volt does nothing but burn more power.
I'll try it with some insulation as soon as I get a chance.
PS Test was with fan running at TEC voltage.
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