Backup battery - what wattage?

I have a G4 450 Dual model7892.
I want to buy a backup plug in power source from APC.
They said the minimum needed for this computer is a backup battery of 540 watts. I cannot get them to tell me how they came upon this number.
Can anyone help or make recommendations for backup equipment?
Thanks,
Mrs H

There may be a power tag on the back of your Mac that lists the Volts & Amps.
In picking the size and features of a UPS, there are several important considerations.
1. What devices are connected to the backup power & what are their wattages. I use a Belkin model F6B750-AVR uninterruptable power supply (UPS) that's rated at 400 watts. I have my G4 AGP Mac, a 17" LCD monitor, my DSL modem & wireless router connected (everything needed to continue operation during a power failure). During use, the UPS is only loaded at 25% of it's output capacity.
2. How long do you want the system to operate after a power failure. I have the Belkin software shutdown the system after 10 minutes of operation (like if I'm not home), unless I shut it down manually. If I recall correctly, I calculated that I could run on battery power for possibly as long as 25-30 minutes.
3. Surge protection - In addition to the battery backup electrical outlets (4 each), the Belkin UPS has 2 additional outlets that are surge protected. I use these for my other devices, like a printer, etc. The surge protection keeps high voltage spikes from damaging your equipment.
4. Automatic Voltage Regulation - The Belkin UPS regulates the output voltage at 120VAC, regardless of a low line voltage like durning a brownout.
5. Broadband/Phone Line Surge Protection - The Belkin UPS has a plug for a standard telephone line connection (like for dial-up), an ethernet plug for DSL line connection & a coax connector for cable connection. All of these are surge protected.
Your G4 450 Dual could probably use a UPS with the 400W rating, except it would have a shorter battery run time. There's not a whole lot of difference in price when you get a higher rated UPS, so get one larger that 400W. I would recommend that has the features on the Belkin UPS.
Hope this info helps in your purchase decision. A UPS protects your computer hardware like a backup hard drive protects your software. You need both.
 Cheers, Tom

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The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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