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From my cold finger dslr work i know how important the bond is between the TEC and the sensor back, i trust you guys are using high quality thermal paste like Artic Silver, some materials are not very efficient and the pads while potentually less messy are lower in efficency. Good 55-60w TECs can require as much as 6amps and i never used stackibg fir that reason. I am amazed at how my ASI1600MM-C manages to produce a delta T of 45C out of a 2amp input, on a chip just a little smaller than APS-C. If you can work that out it makes remote site operation much easier on power consumption.
Keep at it, i enjoy your discussion.
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