2016-11-29 12:14 AM - edited 2016-11-29 12:16 AM
The actual UPS configuration required is chosen by run time and energy usage, and energy usage is dependant on the configuration of drives and shelves.
If you have a FAS2554 with 24 x 6TB internal drives, worst case power usage at 110V is 650W, with 560W being typical.
For a typical 15 minute minimum run time, supporting only this single shelf configuration, you would be looking for a 1500VA/1200W UPS that might only be rated for 5 minutes at full load, but 12 minutes or more at half load.
2016-12-04 09:26 PM
Thanks for the update!
From your provided specs, typical usage is 864W, but worst case is 1060W. For a 30 minute runtime, via APC's calculator, you would require a 2000VA UPS, which would use 74% of capacity.
Larger VA rated UPS will provide longer run time, allow larger loads, or both.
Remember to also size for network equipment, and cooling.