I did some temperature research and I concluded that working fan inside of my weatherproof case cools down CCD temperature by 5 degrees. (I didn't expect this).
More details about it. As Usual I run the script that measures 3 temperatures and time stamp every 2 seconds. That's it.
get_temperature(0),get_temperature(1),get_temperature(2), time.
During a hot day I switched my fan inside of the box on and off many times without opening it.
This was my records:
time Temperature outside (F) fan state
-------------------------------------------------------------------------------
10:50 88 on
11:51 97.1 off
12:28 96.7 on
1:13 98.0 off
1:40 98.2 on
2:18 96.8 off
2:46 100.5 on
3:23 97.3 off
3:52 99.0 on
rain started (lowest temperature was 82)
4:45 90.5 off
5:40 88.5 on
7:01 81.8 off
7:51 82.8 on
I attached file with the temperature data:
Before the rain started there is a strong correlation between temperature up and down with fan on and off. It heat up to 74C with fan off and cools down to 69 deg when fan is on.
If temperature reaches 74C when outside temperature was 100F it explains why it continues to work. I assume that it will shut down at 80C like my
A1400 in my car.
May be in my car camera is exposed to direct sun while in my surveillance camera it's not direct sun.
In one hand fan cools down camera by 5 degree, in another hand it works good without it and I don't know if there is a real benefit to keep CCD in 69C with fan vs 74C without fan.
