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Woohoo!!
Well guys, the first results are in (and no, I'm not talking about the Qld election yet).
I've just done a full first trial run on my latest cooled box design and I'm thoroughly delighted with the results.
I started at an ambient of 20.75C and let the cooler run for 10 minutes without switching on the camera at all. After 10 minutes, the temp in the box was 4.8C and falling. The camera, by the way, was/is a 350D. I have not yet wired in any temperature controller so I just let the system run for 45 minutes to see what it would do.
I switched the camera on after ten minutes and started back-to-back 300 second subs at 1600. The temp sensor was velcro'd to the back of the camera beside the screen.
The crazy thing is that the general pattern of temperature decline did not seem to be significantly affected by the camera. The trend-line on the attached graph seems to have continued pretty much undisturbed.
It hit zero after 30 minutes, but continued to fall to -3.4 after 45 minutes. The 350D doesn't have a temperature sensor built-in so I can't say what the actual sensor temperature was.
This means, a drop of about 24C in real terms - no bull!
I know this means I'll have some condensation issues unless I regulate the temperature closely but even if I have to keep it to 3 or 4C on the positive side, I'll be delighted.
The design for this cooler box is built around a Custom Thermoelectrics air-to-air Peltier. The inside and outside of the box are both insulated. I'll post some more pics of the finished article if anyone want.
Peter
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