How Do 38W and 92W Peltier Cells Compare in Efficiency?

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The discussion centers on the efficiency comparison between 38W and 92W Peltier cells, noting that both have identical dimensions and junction counts, with only a slight temperature differential. Questions arise regarding the accuracy of seller claims and whether material differences, such as Seebeck coefficients, contribute to the efficiency variations. There is also a mention of efficiency loss related to size and the potential benefits of using multiple cells for better performance. The conversation reflects a blend of personal experience with Peltier technology and curiosity about its applications in consumer products. Overall, the efficiency of Peltier cells is influenced by several factors, including material properties and configuration.
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A while back, I purchased a 38W peltier cell on ebay. It wasn't powerful enough, so I'm looking at something along the lines of a 92W. I noticed, however that my 38W and the 92W have the same dimensions and the same number of junctions. Also, dT of the 92W is only 1 degree C above the 38W.

How is this possible?
Are the sellers providing false information?
Is one made out of a material with a higher Seebeck coefficient?
If so, will one be more efficient than the other?

Also, a general explanation as to how the different factors effect a cell would be greatly appreciated.
 
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I remember reading that there is some falloff of efficiency with size and that using multiple cells is a better way to go.
I got my first chip on a 80286 processor cooler (6 mhz:bugeye: ) and been playing with them ever since. I heard that the 08 Chrysler Sebring is coming out with heated and cooled cup holders...I can bet how they're going to do that.
 

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