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Power supply clarification

 Post subject: Power supply clarification
PostPosted: Tue Aug 13, 2013 3:18 am 

Joined: Tue Aug 13, 2013 3:09 am
Posts: 1
I'm sorry if this has been asked a million times but I'm having a hard time getting the answer I'm looking for. I don't know a lot about electricity so its hard for me to understand the power needs of a peltier cooler/heater.

I have been looking at this unit:
http://www.amazon.com/TEC1-12706-Thermo ... ric+cooler

Paired with this power supply:
http://www.amazon.com/12-Volt-Power-Sup ... B00B8TM8JS

The Peltier is 12v, 92w. Does that mean it draws 7.6A? I keep seeing everyone talking about hooking them up to computer PSU's, but my application is a small "fridge", not cooling CPU's.

Would the power supply I found work for the unit since it is 12v, 9A?

 Post subject: Re: Power supply clarification
PostPosted: Tue Aug 13, 2013 8:56 pm 
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Joined: Sat Nov 06, 2010 1:33 pm
Posts: 23
Location: Canada
The short answer to your question is that the 12706 peltier you listed is going to draw around 6 amp at Vmax (15.4v). So if you power it from a 12v power supply it will use less power. It's hard to know exactly how much less. I'm going to make an educated guess based on this unit: http://www.customthermoelectric.com/tec ... ec_sht.pdf that the current drawn at 12v will be around 5.6 - 5.8 amps. So that power supply should be adequate. However I would recommend using lower guage wire (thicker wire) to reduce the risk of the cord heating up and/or possibly a fire. Also note that by powering it off of a 12v supply the dT will be reduced somewhat but should still be easily adequate for a small fridge or portable cooler type arrangement. Also note that the 92 watt title is misleading this is Pmax as in P=IV or 92 = (15.4*6). Rather than the Qmax, maximum energy moved, which would be around 60w. Also as with all heatpumps the hotside will need some cooling, more info regarding TECs can be found on this page: viewtopic.php?f=4&t=19. Hope that helps a little bit.

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