29 May
2007
29 May
'07
7:02 p.m.
On Tue, May 29, 2007 at 02:55:02PM -0400, Jim Perrin wrote:
On 5/29/07, Mark Hull-Richter mhullrich@gmail.com wrote:
Getting a little OT here, but how does one match up the VA ratings of the UPSs (and battery backups) with the power supply wattage ratings?
Watts = Volts x Amps. I usually use a sliding scale based on # of machines.
Which is correct for DC circuits, but not for AC. A 1500VA UPS does not provide 1500Watts of power. And given the output of UPS's aren't necessarily perfect sine waves, it gets more complicated.
A typical APC 1500VA UPS has around 860->900Watts of power.
The answer to Mark's question is "check the manufacturers web site" :-)
--
rgds
Stephen