[CDKPhil]

Thanks again guys, the physics lesson was very informative.

For curiosity sake I will attach some thermometers to the dome and mount and measure their surface temperatures. It will be interesting to see the difference between the air temperature inside, outside and surfaces.

Originally Posted by coldlegs

When the sun comes up the 12v relay kicks in and the low mounted fan blows out the dense moisture laden air and the panel charges the battery. When the sun goes down the 12v relay kicks out and a 2w resistor turns on and runs all night under the cover keeping the gear warmer than ambient (maybe!). Might be overkill but I'm going to give it shot. Bought the bits and will let you know how it goes in a month or two.
Cheers
Stephen

Thanks Stephen I will be very interested to hear how you go. Nice Obs by the way.

I am wondering how many other observatory's suffer from this but no one has noticed?

Originally Posted by avandonk

I used to thermostatically heat my 300mm lens to about 16C in winter and 20C in summer 24/7 to stop condensation and focus shift. I am currently heating my RH200 to 17.0 +- 0.1 C so focus does not change and there is no chance of condensation.

Bert

That is interesting Bert, what are you using to maintain the constant temperature?


Cheers