I have completed my controller box and attached a few photos. Both the possible input devices are fused (the battery plug, and the AC/DC converter), and I will be putting an output side fuse on the TEC. Its hard to tell from the photo due to the small space, but I have setup the PWM +12V to run through the controller relay contacts so the controller can turn it on and off. The fan is wired directly and will be running at max all the time. The three pair shown at the camera end of the cable are the fan power, TEC power, and the temperature sensor leads. Tidy up of the camera end leads and connectors is the next step, after I finish the camera carbon fibre shoe and fan brace. Basic testing with the camera sensor attached (the controller won't work without that hooked up) showed the controller was switching the PWM on and off as I moved the control value around the ambient by the d value. The 'work' light tells you when the controller has turned on the PWM and is cooling. BTW factory setup (at least on mine) was that the relay was closed and that won't change until you program in your values.
