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I’m using 4A 40 x 40mm Peltier. I butcher DSI heatsink fins so the Peltier sits flat on the camera body. Hot heatsink is from some old CPU with original fan. I cut two notches on remaining camera heatsing fins so it can be clipped on. The camera body is insulated by black foam, glued on by contact cement. I know it could achieve lower temperature with bigger heatsink, but the camera is heavy and bulky as it is.
The controller comes with tiny thermistor to sense temperature. I drilled small hole in the heatsink, fill it with heatsink compound and epoxy thermistor in it. Output FET is MTP3055 rated at 12A. It really needs heatsink and you have to fashion one yourself, as there is no provision on PCB to mount one. For your application I would change this FET for one that can handle bigger current. There is one mistake in the assembly instructions concerning jumper link that configures PCB for cooling or heating. If you going to build it, let me know, I will look where that link is supposed to go.
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