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Not many of us are doing it and for good reason. I can tell you one thing you need to bare in mind is to have multiple redundancies for everything. With this you can eliminate a lot of angst.
Scope dome is good. I have been using it for nearly three years in two guises and it works well, is near bullet proof and never fails to do what is asked of it. Worth every penny I spent on both systems.
IP Switches are essential and as pointed out use ones without fans and that have a web page for remote connection. It will mean you can also shut down your computer too and give that a rest. Buy several as backups so that if one does go down and you have to drive to site you can replace it instantly. Make sure you put all of them on the same network at once though, so that you don't have to get the spare up on the network later.
Make sure you have a router/modem on site with port forward switching. The IP swtiches will be forwarded through that router. Camera will be port forwarded too. Camera must have its own web page too. It will mean it is independent of the whole system had help in times of breakdowns.
Static IP's are a must. They cost a bit more but will mean you can dial in from anywhere in the world.
For coms you can use either Ethernet, Ethernet via power or wireless. I have two types at my observatories in case something drops out.
Make sure your modem has a UPS installed to power it up too. It will act as a redundancy for you and allow you to remotely access the camera if your power system falls over.
Going off grid is a big challenge to think about for remote. Like Eric said, get loads of batteries and a huge inverter. If you are on grid get a good UPS that can at least switch everything off and close the shutter once it detects a power failure.
I am using standard computers in my system. I have inspected the insides of the oldest one recently and you would not even know it is exposed to a moist environment. There is no corrosion at all and that is from a site which has very dew conditions. Fits are good but a desktop will be ok.
Don't worry too much about moisture in general. Observatory equipment is ok against moisture and computers etc with some over head protection will be fine. No need for moisture extraction. It all dries out fast enough during warmer days.
Dew protection is a must but I have a Mount Hub Pro on both scopes which has the dew heater on always once the power comes on. It eliminates dew issues. Any dew system will be set and forget.
I use an AAG cloud watcher and I think it works fine. I have mine on the mains though and if the power goes out the computers will see it has dropped out and will close down the system so that I don't run down my UPS. This acts as a safeguard against power outage for me. On batteries you will not have this problem but I thought I would mention it.
Settings on cloud sensors can be critical. Since I have my gear quite close to the coast I have my system set to close once cloud arrives. The cloud contains moisture but I don't want to wait for the first drops of rain before the roof closes.
Like Eric said, if you can setup first in your back yard and hammer out the dramas before you have to get in a car and drive some where. I did not do that and I spent a lot of nights driving to hammer out problems. So learn from my mistake.
Insurance for theft is what you really need here. A large fence is one thing but in remote places thieves don't really travel out that far. You won't get insurance for storm damage once you mention the roof opens and closes. No matter what you show them, you will be denied. And; there is no point in not revealing it at time of policy implementation. If they find out later the roof opens and closes you will not be covered.
Don't bother with the GPS. Get time from an international time server. It will be very accurate and then use plate solving to get you on the mark.
If I think of anymore I will add it later. Hope this helps.
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