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Hi Jo. Serious cooling of a DSLR... I used a 40 x 40mm 15V 8A TEC achieve a max differential of 34C - 38, if you were prepared to wait an hour or so, but -30 with relative ease and control.
The size of the TEC is not the whole story. Heatsink rating is very important. Basically, for any size TEC, performance is predicated on the ability of the heatsink to reduce the temperature differential between the hot and cold side - that is, maximum heat removal.
The heatsink must also dissipate the energy used to drive the TEC, otherwise it becomes less efficient. It's not a simple formula and is also dependent on heatsink design. Passive, forced, brazed or skived fins, copper aluminium and so on.
Thermal resistance of the heatsink is another factor and possibly the best indication of performance. Low is good. If in doubt double the TEC wattage to get the heatsink capacity.
It's more about heatsink than TEC module - choose carefully. I find that TECs have a sweet spot depending on the heatsink rating and there is a practical limit to the size of the heatsink - more power is not necessarily more cooling - heating instead.
If this hasn't put you off, good luck with the mod.
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