I'm sorry but I don't understand what you mean there.I have a Pi ... in an AC office on a battery backup
I think AC means air-conditioned. It appears the battery backup is powering a television, an Intel NUC as well as the Raspberry Pi.
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Actually the TV is powering it just fine (it's unlabeled but since it's been going 12-18 hours and full clock speed often I'd guess it's a 1 amp).
Since the power source you are using causes low voltage, overheating and lockups, I would suggest configuring the built-in watchdog timer to reboot the system when it crashes.