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Also forget about the UPS software automatically shutting down your PC. Sounds good in theory, but when you are running remote, who's going to power the system back up again when mains is restored?
If your PC remembers its state when power is lost, you don't want to change this to off by shutting it down. Leave it running. I have an small APC UPS. Similar to Phil, it only runs the system for five or so minutes. I didn't buy the UPS to be able to operate with no mains power, I bought it to ensure I could obtain the cleanest power and protect the equipment.
When operating in a dome whereby you can close the observatory shutter without needing to park the telescope, you've got a major advantage. In the case of a ROR where you must park the scope in order for the dome to close, you simply need enough power to achieve the task. If you can't do this task in 89 minutes, you've got major problems.
Keep it simple. Protecting your equipment is #1 priority, in the end, nothing else matters. The hassle of relaunching software and starting your imaging plan once mains is restored is insignificant compared to a telescope exposed to the elements due to a observatory that can't close due to no power.
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