UPS size requirement for SLI system?

[AncientSword]

I was just wondering what size ups my friend needs to handle his new build? I was looking at a wattage calculator for PSU on newegg and it recommended 1209 watt PSU. He has a Tagan BZ1100. System consists of an evga 790i, Q6850, CoolIT Coolzone FZ1000 TEC cooler, 8 gigs OCZ Reaper DDR3, 2 Veloci Raptor 150 GB in raid 0, 3 x 8800GTX SLI, and an optical drive.

He has an APC 1500 VA UPS and it will not power the system on battery. I believe the APC is only 900 Watt and I am wondering if his system is drawing more than that or does that UPS have a problem? The UPS is almost new as well ....

Any suggestions? Do any of you power gurus know what wattage this system will draw? Just wondering, as I don't have a clue ..... Anyone have a link to where I can read standard wattage draw for individual devices?

[Gogeta]

If I had to guess, which may not be any more credible than a guess of your own, I'd say the total draw from the listed system under 100% load is around 700W.

Does the APC unit have any problem powering only his monitor along with several other components/peripherals/accessories? Try testing the UPS with a lighter load.

I'm using a Cyberpower 1500AVR(1500VA, 900W) that gives me ~5 minutes of run time with 3 computers attached - e8400@4GHz, Q6600@stock, AMD MT-37@800MHz, 2x DFI X48-T2R, 12GB of DDR2, 10 SATA hard drives, Rocketraid 3520, 7950GX2, 8400GS, Dell 2407WFP, fans, peripherals, etc.

[Levish]

is the TEC Cooler on its own powersupply? those things are power hogs ...

[cobra_kai]

If you want a really badass UPS, build your own from some deep cycle marine batteries and a sine wave inverter.

[AncientSword]

The TEC is running off the same tagan 1100 that runs the whole system.

Everything is a little weird when he has all 3 - 8800GTX in the system at the same time. Grid, which is what we are testing it with for games right now, has some chunks. But with only 1-8800GTX in the system, it plays perfectly smooth. We were wondering if there is some kind of power problem when all 3 cards are in. I ran neweggs psu calculator and it says he needs a 1200+ watt psu. He has a Thermaltake toughpower 1200 he can take from his other system and try it in this one. It is just a big breakdown to tear into the case (Zalman Z1000) where all his cable routing goes behind the board.

[AncientSword]

I forgot to say that the APC will run the system with only 1 8800GTX installed. It won't with all 3 in.