Quote:
Originally Posted by rcheshire
Dunk. For our application finding a sweeter spot is just a matter of balancing supply to the TEC with the capacity of the active heatsink to remove the cooling plus supply energy.
Depending on the effectiveness of your heatsink a lower voltage/current may produce a higher differential. TECs are all about energy out extraction vs energy in.Too much in or insufficient out limits performance. A bigger TEC may confound your cooling efforts.
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Thanks Rowland, I've been experimenting the past couple of nights and at about 1.5A (running from my 12v battery) the cooler dropped the camera temperature (as reported by the EXIF data) from 25C to 12C. In my previous experiments 12 is the borderline for acceptable noise, so it seems it can achieve my objective of countering the Queensland summer
I have yet to try one of my other heat sinks to see if it's more effective. I ran into an issue last night where it had cooled to 12C and then the shutter got stuck
I power cycled the camera a couple of times and it isn't now working correctly. Puzzled by this one as it had been working perfectly up until the time I wanted to take a sub in anger
hopefully I'll be able to resuscitate it with the shutter from my spare 1100D.