BQLZR Semiconductor Refrigeration Tablets 62mmx62mm，Heatsink Thermoelectric Cooler Cooling White TEC1-12730 253W Thermoelectric Peltier Semiconductor Clip Cooler

This Peltier is the largest unit I have purchased to date. I have several smaller units, but this puts out the most "cold" I've ever seen. When I first received it, I tested it with a 1.5 volt D cell battery. It started getting cold/hot almost instantly even with that low power battery (great way to test without burning yourself I might add...and also an excellent, safe way to find the "cold side"). This Peltier unit will require a large power supply. Just to be sure I had enough power without overheating, I bought the 1000 watt, "AmpFlow SCN-1000-12". Then I used a "Cooler Master Hyper 612" for the hot side (plus another solid copper heat sink mounted to it), and a "Cooler Master Hyper 212" for the cold side. All works quite nice, but you better have an outside outlet for the hot side, or you will waste all the cold you produce (and there's a LOT of cold coming off this 62 x 62mm Peltier unit. Very nice unit, at an excellent price. I'm ordering a second unit for future projects.

It works great as it was designed for

This was tested with a lab bench power supply at multiple voltages and thermal loads. The device never pulled more than 8amps at 12. There was a water cooling block and thermal compound on both sides of the device. Several spots on the cold side also gets extremely hot leading me to believe the elements below it are damaged and not pumping heat. Buyer beware. This is for the "TEC1-12730".

Peltier Thermoelectric Heat Pump62mm x 62mm x 4.8mm(2.44 inches square, about 3/16" thick)Got up to 15 volts at 30 amps?The rate of cooling/heating depends on how much power is applied.Don't even think about hooking up 12 volts before putting one or two heat sinks in place.It can get REALLY hot and cold, really fast. Don't burn it up and/or burn yourself.Don't overvolt - you'll trash it.If you just want to hold it between your fingers and experience an odd sensation, 3 volts would be enough.Of course, the smaller ones can accomplish that as well, but this one is larger and size matters.

Largest I could easily find. Other reviews of ensuring cooling on the back side are very true. Ordered one part and it worked great for a few weeks, then one corner of the part would not cool. Ordered two more as back ups, both arrived non-functional. One drew no current at any voltage and other drew normal current but did not cool (both sides got pretty hot). Returned two defective units, now awaiting order for two new units. <crosses fingers>

Im working on a water cooled LED lite and this is the answer on the cooling part, a bit pricey and very power hungry ( gonna require its own power supply 9 - 12VDC at 20A+)

Minimal cool down at maximum input power (down only by few degrees), was properly assembled with a large copper heatsink and fan attached. Will return it for refund.

I just bought this as an experimental mess around kind of thing and I don't doubt it pulls 253W, in fact I'm pretty sure it pulls more than that as it takes two old computer PSU's to power it. The amount of heat this thing produces is crazy but given how Peltier's are this isn't really any surprise (unless something's wrong with mine) I can't actually cool it enough to make it very cold on the cold side. I think I'll have to devise some kind of water cooling system if I was really serious about using it for something. But since this was just a fun play around thing I don't know if I'll do that. I think most of the negative reviews on here are from people who don't have the ability to cool it properly.