I was under the impression that a UPS was used to protect the system from dirty power. Surely you wont be using the UPS isolated from mains power. If your concern was shutting the roof to protect gear in the event the obs loses power I would have thought that in the (hopefully) rare event that this happens you wont miss the extra data from that night.
I would set it to shut as soon as mains power is gone if there is an option for that.
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