The problem is that these two Watt metrics dont correlate to each other.
Example 1: Dell's Poweredge T710 advertises two 1100watt Power Supplies, but according to APC, uses only 694watts.
Example 2: Dell's m1000e Blade Server can hold six 2700watt Power supplies (16,200watts?), but uses only 4100watts.
Bottomline, like speakers, manufacturers use "Wattage" to imply the "mightiness" of a unit. Your desktop that has a 500w neon, water cooled power supply, barely uses 150watts, but 500watts sounds cool. Just know that many times these are Marketing Specs and not electrical specs.
When sizing UPS units, a simple trick is to look at the equipment's plug. The load cant be any more than 80% of the plug. So a blade server with a C14 12amp outlet, cant be any larger than 1150 watts.
