NSS 300 series confusing power specs

Hi,
I am trying to figure out the minimum UPS specs required to use with a NSS324 NAS.  But on the Cisco documents (quick start guide and admin guide) the text are quite confusing. There is a table where the power input for the 2 Bays unit (NS322) is said to be 7 Amps and 3.5A for the models 324 and 326. As the specs does not states at which voltage are these current measured (in a range from 100 to 240V), I assume it to be at the minimum (100V) or 700VA ("W" power factor = ?). 700W for two HD and one motherbard? And half that figure for 4 and 6 bays? That does not sound right to me. The same documents inform that the UPS must operate for 10 minutes (minimum) and be able to provide 350W.  That is not the same to say that you MUST provide 350W FOR 10 minutes.  If this is true, buying an UPS from APC I must choose an 1200VA unit, that seems a bit overkill to me.  Someone has a better picture for this scenario? I would appreciate any help!
Andre Wiermann
Brazil

Sorry,
I meant to say 250 Watt Powersupply for NSS324. I moved a line while reading.
And here is the rest:
NSS322 Smart Storage
NSS324 Smart Storage
NSS326 Smart Storage
Power Supply (Wattage)
80W
250W
250W
Power Consumption (Operation)
25W
35W
43W
Power Consumption (Sleep)
16W
19W
22W

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