[LewisM]

OK, a new batch of ex-Hong Kon Peltiers / TEC's arrived just now, and I tested them - good fast cooling, but as usual, the heat wins and transfers through to the cold side.

I had the same issue in a cooler box I made using a peltier purchased at Jaycar. I am using my powertank to supply the juice, RAW, without any inverters, resisters etc. Am I doing this wrong? How do I go about making it so that it stays col on the cold side? (yes, I have used properly thermal-pasted heat sinks and fans, and NO difference - my cooler box becomes a heater very quickly!)

HELP PLEASE, as this is driving me totally insane! I get the same result if I use my mains power supply through a converter.