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Does this UPS Output "Pure" Sine Wave?

post #1 of 8
Thread Starter 
Looking into purchasing this Tripplite UPS for my sig rig. My Seasonic PSU uses active PFC of course, so I need a UPS that can output pure sine wave for compatibility.

In the specs it says it uses PWM sine output from the battery. Is that the same as "pure" sine wave or do I need a different model? headscratch.gif
post #2 of 8
PWM sine wave output means that the unit has small "steps" in the sine wave. The higher end APC units have 64 steps in their output, 32 above, and 32 below the 0 voltage reference. I'm not sure about the Tripp Lite you linked, but it's a reputable company with a long history of UPS and power management for data processing/IT. I don't think you will have any issues.

That UPS will run a high performance PC at IDLE for about 20-30 minutes. If you were doing any kind of high performance computing or gaming, probably closer to 5 minutes. I doubt the power inefficiency caused by poor power factor conversion will be noticeable on the electricity bill. LOL.

Greg
post #3 of 8
Thread Starter 
Quote:
Originally Posted by hammong View Post

PWM sine wave output means that the unit has small "steps" in the sine wave. The higher end APC units have 64 steps in their output, 32 above, and 32 below the 0 voltage reference. I'm not sure about the Tripp Lite you linked, but it's a reputable company with a long history of UPS and power management for data processing/IT. I don't think you will have any issues.

That UPS will run a high performance PC at IDLE for about 20-30 minutes. If you were doing any kind of high performance computing or gaming, probably closer to 5 minutes. I doubt the power inefficiency caused by poor power factor conversion will be noticeable on the electricity bill. LOL.

Greg
Thanks for the info! From what I've read, I was under the impression that if the UPS doesn't output pure sine you'll still get power interruptions when it switches to battery mode. Is that not the case?
post #4 of 8
Quote:
Originally Posted by Booty Warrior View Post

Thanks for the info! From what I've read, I was under the impression that if the UPS doesn't output pure sine you'll still get power interruptions when it switches to battery mode. Is that not the case?

That's completely unrelated behavior. All modern PC power supplies will pick up the load within 1 A/C cycle before your PC has a chance to shut down due to lack of power. The filtering capacitors in your PSU will provide enough power for 2-3 full A/C cycles before they're too discharged to support the PSUs rated capacity.

You might be thinking of a "true" UPS. In a genuine uninterruptable power supply, the load runs off the inverter in the UPS 100% of the time, while a parallel circuit provides charge to the battery bank when the UPS is connected to mains power. When the mains power fails, the charger circuit stops but the inverter keeps on running on battery until the battery is discharged. In that situation, there is no interruption at all (not even 1 A/C cycle) from the time the mains voltage stops. None of your current generation "cheap" desktop PC UPS units work like this. You need to get up into the commercial 2500 VA on up units to get a true online UPS, and even some of those end up being transfer-switch based adaptive load units that have a 1 cycle break in power.

Unless you're running a 24x7 server with critical uptime requirements, I really wouldn't worry to much about it. And if you ARE running something like that, you need dual power feeds, an automatic transfer switch, and two UPS to ensure a power feed issue doesn't turn into a outage. =)

Greg
post #5 of 8
Thread Starter 
Wow, thanks for the detailed reply! Great stuff! +reps thumb.gif
post #6 of 8
Slight chance of a interrupt since it is a PWM wave but may not be the biggest issue here. Do you know how much you are pulling at the wall with your system? I would really recommend something bigger if you can afford it. You start to pull more than 450w through that UPS will drive you nuts with some beeps.

Great guide if you haven't seen it yet: http://www.overclock.net/t/1305395/the-uninterrupting-uninterruptible-power-supply-ups-guide
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post #7 of 8
Thread Starter 
The most I've pulled thus far is ~330W according to my Belkin meter. I'm not looking for something to game or render on when the power is out, I just want enough time to save and shut everything down properly when the power goes out.
post #8 of 8
Quote:
Originally Posted by Booty Warrior View Post

The most I've pulled thus far is ~330W according to my Belkin meter. I'm not looking for something to game or render on when the power is out, I just want enough time to save and shut everything down properly when the power goes out.

Then you're good to go, though if you can swing a 1000VA unit then it would be more in the "comfort zone" IMO. The 700-series Nvidias must be much more power efficient than the 500-series. I took a look at your sig rig and was thinking it would be up around the 400-450w mark. Only familiar with 500-series power draws though so wasn't sure.
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