Quote from: galtbit on January 12, 2014, 09:21:44 PM

Quote from: AnonMZ on January 12, 2014, 05:19:46 PM

Quote from: galtbit on January 12, 2014, 07:26:10 AM

Maybe some more info would help:

I have a Rosewill LIGHTNING-1300 1300W PSU
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182063

I know the PSU isnt using all 1300 watts but the mining rig uses around 900 watts.

Thank you Anon and Unacceptable for your answers.

From your link, and going to the more expanded specs from the Rosewill page:
http://www.rosewill.com/products/1799/ProductDetail_Overview.htm
Active-PFC with auto AC-input voltage adjustment(100-240V)

It appears that your PSU is equipped with Active PFC (Power Factor Correction), so it falls under the second example Ive posted above.

To be safe, youd require a higher VA rating UPS to handle the power. A 1.6 to 2KVA as Unaccptable noted should be sufficient, for the load. That would cover your capacity (load) needs, and run time would ofc depend on battery(s) Ah size.

In addition, due to the PFC, the UPS would need to be highend/smart or closer to true sine wave output.

This maybe of help: https://www.dougv.com/2010/03/01/active-pfc-enabled-psus-are-not-compatable-with-most-low-end-ups/
In short, if you send a high-end PSU the current created by a lower-end UPS, the PSUs built-in power factor correction hates it, and cuts power to the PC immediately. As in, the exact thing you bought the UPS to prevent in the first place is exactly what happens.

While I understand the value in having a high-performing PSU less heat, more power, protection for internal components a straight-up power off of the PC is never a good thing. So your choices are either to forgo a UPS, purchase a really expensive UPS, or purchase a low-cost PSU

Hello Anon: Thank you for the info you supplied. I was able to plug my rig directly into my Kill A Watt and see that the total amount of Watts is only 720 the most. Thats without the monitor, fan an other things not connected to it. Thats what I really want. Just to cover the rig. In that case, what do you think of this UPS? It can 850VA and t says it has a pure sine wave. New Egg says it handles 1350 VA 810 w which may cover it. Am I on the right track?

http://www.newegg.com/Product/Product.aspx?Item=N82E16842102133

you need better then that . there is a great ebay/refurbished seller I will find the link.

http://www.ebay.com/sch/excessups/m.html?item=350959716966&pt=US_Uninterruptible_Power_Supplies&hash=item51b6d44a66&rt=nc&_trksid=p2047675.l2562

the one below is better
http://www.ebay.com/itm/APC-SMART-UPS-1500-1500VA-980W-SUA1500-USB-UPS-NEW-BATTERIES-/350972274739?pt=US_Uninterruptible_Power_Supplies&hash=item51b793e833