Ups for imac g5 20in lcd

TIA for any help re: my quest for a ups. i believe the imac g5 -20 in. is 185 watts. to determine the VAC of a proposed ups, one must convert the computer watts to VAC. i understand that the wattage is 60 - 70% of peak power and that figure ( peak wattage) is the desired VAC. therefore, i would need a unit of about 300 VAC. this seems to be a very low number as most of the units i see at the store are for 800, 900 or 1000VAC.
also, i understand that the ideal situation is to have instantaneous switchover in the event of a power loss, however, those units seem to start at $400 plus.
my only desire is to shut the system down properly to avoid damage to hard drives etc. again, TIA
imac G5   Mac OS X (10.3.9)  
imac G5   Mac OS X (10.3.9)  

Hi Brenmar and welcome to the discussions!
The units that you see in the store are larger than what just your computer would need. Remember, a lot of people are still using CRTs - shudder to think! - that use a lot more power than LCDs. A UPS is also designed to power more than just your PC also. People have printers and routers and such plugged in there as well, even though you are not really supposed to plug in a printer.
If you use the APC configurator and plug in you system info, it will make several suggestions. I put in a G5 iMac with the 20" display, and inkjet printer, a cable modem and router, and my powered speakers. It suggested an 800VA unit which sounds a little high. I have a 650VA and it works fine.
I suggest APC very highly. I need to get another UPS for my other PC and will be getting an APC brand this time. It will connect by USB cable to your Mac and be detected under your energy saver preferences.

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