I need an UPS for my system

[ClaudiusIX]

So monsoon season is coming and I want to know what UPS would be best to protect my system from the usual minute long power outages that we have during the monsoon season, i was looking at the CyberPower CP1500AVRLCD

http://www.cyberpowersystems.com/products/ups-systems/intelligent-lcd-ups/CP1500AVRLCD.html

I know that it only outputs 900W but i doubt my system will be at peak when an outage happens and i need something that would be enough to give me like 2 or 3 minutes so i can save my work and shut down

System Configuration

Case:Cooler Master Cosmos II

Motherboard: ASUS Rampage IV Extreme

Processor: Intel i7-3930K

Power Supply: Seasonic X-1050

Video Card: EVGA Signature+ GTX 680

Hard Drives: Samsung 830 Series 256GB
OCZ Vertex 4 256GB
Seagate Barracuda 3TB 7200RPM
Seagate Barracuda 1TB 7200RPM
3x Seagate Barracuda 500GB 7200RPM (RAID 5)

Cooling: XSPC Raystorm Extreme Universal LC Kit

Fans: 10x Gelid Wing 12 PL

BD-ROM: LG (Something Dont Really Know)

Display: 2x ASUS VE258Q

 

[Shotzo]

Well, here's what I run, so you can compare:
Cyberpower 1000V / 600W UPS - http://www.newegg.com/Product/Product.aspx?Item=N82E16842102132

Intel Xeon 2687W (60% faster!)
80+ Gold 850W PSU
2x GTX 460
1x 7.1 Surround Sound
4 monitors
All fan slots on my case (same as yours) are filled with fans, plus 8 of the LED channels are filled with CCFL lights (It's lit up like a christmas tree! )
2x SSD (including OCZ Vertex 4)
8x HDD (2TB 7200RPM)
1x optical drive

At maximum load (100% GPU, 100% CPU), my 600W UPS reports 620W usage (including monitors, which account for 100W). This is enough for 90 seconds of power.

At idle, my UPS reports 408W usage.
With monitors off, and at idle, 288W.


In summary: your UPS will provide 90 seconds of power at full load. If this is a concern, do not run folding@home, and you will be fine. If you temporarily overload your CyberPower UPS (I have before), it will beep. Loudly. But it will not turn your system off unless it is significantly overloaded or a power failure occurs. My fully loaded UPS (eading 592W out of 600W) is unable to keep power to my entire system when I pull the plug; the motherboard intervenes and shuts down the computer when the voltage levels drop too low (this may be the cpu power supply just being unable to hold up the voltage for more than a few ms).

 

[Pinhedd]

Most UPS' use lead acid batteries. This means that while the energy density isn't very high, the potential current output is tremendous.

The PSU I use is from American Power Conversion, the APC XS 1300. It's been replaced by the BX1300G

http://www.newegg.com/Product/Product.aspx?Item=N82E16842101492&Tpk=XS%201300

Should work wonderfully for your setup

EDIT: Just FYI connecting a UPS's communication port (usb) to your PC will allow you to monitor when the AC line fails and enable a power plan automatically like you would on a laptop when it is unplugged

 

[ClaudiusIX]

Is there an accurate way of finding out how much power the system would be consuming at a particular load? Because all I need was add all the watts from the parts and just got a percentage of it depending on the load, because if what you're saying is right I don't need 900w UPS I could get something smaller

 

[Pinhedd]

Is there an accurate way of finding out how much power the system would be consuming at a particular load? Because all I need was add all the watts from the parts and just got a percentage of it depending on the load, because if what you're saying is right I don't need 900w UPS I could get something smaller

I'm pretty sure that the output rating is while the UPS is delivering power from the battery. If you enable the power management to switch to low power on AC loss then the power draw is guaranteed to be low enough

 

[Shotzo]

It still takes time to switch to that lower power profile though. If you are using 650W on a 600W supply, in the event of a power failure you will still have your computer shut down due to the temporary overload.

 

[username-taken]

http://www.xpcpro.com/power-protection/ups/page-5/?sort_by=price&sort_order=desc

 

[Pinhedd]

It still takes time to switch to that lower power profile though. If you are using 650W on a 600W supply, in the event of a power failure you will still have your computer shut down due to the temporary overload.

Nah, the UPS can put out up to 100% more than the max rated power for a very short duration. Lead acid batteries are designed to handle current rushes.

 

[ClaudiusIX]

Best answer selected by ClaudiusIX.