Is it alright to run PTZs in the sun?

Are you asking is it okay to use them on just sunny days?
 
It alright to have a PTZ in the sun HOWEVER, the plastic housing will not last as long being in direct sunlight. It will start to discolor and need to be replaced.

I have aSD52C225U-HNI 2MP 25x Starlight PTZ on the front of my house now for 2 years. It gets direct sun for about 4-5 hours per day and still looks very clear. If you can I would recommend not using a dome camera outside not only for the fading, but the IR reflection can be pretty bad.
 
I have 2 of the (God Forbid) Huisun Mini PTZ's on the south side of my house in full sun. They have worked perfectly for 3 years now.
 
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