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Peltier POWER rating question!!!

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Mode

New Member
Joined
Apr 27, 2001
How can I know if the Peltier I'm having is really the 72W(rated) peltier or not?
Is there anyway to find out the real wattage of a peltier?

sorry, this is the same post i have posted on the General discussion but i guess, it's better be in the cooling section.
 

TT120

Senior Member
Joined
Mar 1, 2001
Location
Sacramento, CA.
If you multiply the current it's drawing by the voltage it's running at you will get the watts. IE: 9 amps X 12 volts = 108 watts
 

Badger

Member
Joined
Mar 11, 2001
TT120 (Apr 27, 2001 02:26 p.m.):
If you multiply the current it's drawing by the voltage it's running at you will get the watts. IE: 9 amps X 12 volts = 108 watts

Hmm,
I'm afraid thats not really true. The rating of a peltier (or Qmax) is the maximum heat energy it will transfer at a delta T (differential temp) of zero.
The power it consumes (Vmax x Imax) is much higher, usually about twice as much.
This is the spec of a typical 72w peltier:

Imax 8.5A
Qmax 72W
Vmax 14.4
DTmax 69C

As you see to achieve a Qmax of 72W it consumes 8.5A at 14.4V (122W)