Worst case - if you're having this problem, remove the UPS boxes temporarily and risk having processor-based devices reboot during an on-grid to off-grid transition.
Now that our system is operating, most of our UPS boxes were removed anyway, since we only have a few devices that will be affected by a brief outage during the off grid switchover.
Now that our system is operating, most of our UPS boxes were removed anyway, since we only have a few devices that will be affected by a brief outage during the off grid switchover.