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post #41 of 62
nevermind I read it wrong sorry

But is the real power (watts) rating of UPS always 60% of the apparent power rating? It should be more accurate to just say that the real power taken by the PSU needs to be less than the real power rating for the UPS.
Edited by mikeaj - 5/21/11 at 10:14am
post #42 of 62
Quote:
Originally Posted by mikeaj View Post
nevermind I read it wrong sorry

But is the real power (watts) rating of UPS always 60% of the apparent power rating? It should be more accurate to just say that the real power taken by the PSU needs to be less than the real power rating for the UPS.
lol don't worry. Take it like this. The ups industry are in the same boat the psu industry was years ago. There's really no real standards. The Watt rating is 60 percent of the VA. Now not all show the power rating on them. Those who do shows numbers rated by them under their conditions. So you don't know how they got the numbers. Now if the ups maximum output and the psu draw is close to each other either one is going to start to give problems. Some psus just shutdown because of it. Now its not a must that you must play it save but the people who make use of these devices are people who runs servers and businesses who doesn't want to have a lot of down time or loose money due to problems such as these. So 50 percent of the VA you won't run into problems like that and your device will run better aswell lasting a bit longer. Its just recommended its not a must. You can try and run them closer together but its your own gamble your willing to take. Some people have no problems so do. And that's the do that's concerning when money is involved or servers etc etc.
Edited by Spooony - 5/21/11 at 10:29am
post #43 of 62
Thread Starter 
VA = AC watts / power factor

What do you think "Active Power Factor Correction" PSU does?
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post #44 of 62
Quote:
Originally Posted by Spooony View Post
what brand ups do you have? What psu do you have?

And 1250 va is 750w not 900w.
I have an apc 1250 RM 5U ups. It is most definitely a 900w ups. Dont forget, va is subjective. The psu's are an intel 500w redundant, something from rackable systems, two apple servers, a switch, and an antec truepower trio 650w.
Edited by u3b3rg33k - 5/21/11 at 2:31pm
 
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post #45 of 62
Quote:
Originally Posted by Birthday Attack View Post
What do you think "Active Power Factor Correction" PSU does?
In practical terms, a power supply with PFC basically means that the manufacturer can sell it in Europe.

Quote:
Originally Posted by u3b3rg33k View Post
I have an apc 1250 RM 5U ups. It is most definitely a 900w ups. Dont forget, va is subjective. The psu's are an intel 500w redundant, something from rackable systems, two apple servers, a switch, and an antec truepower trio 650w.
Does that mean your power draw is high? No. Remember 60 percent is not a exact. but in the industry they assume 60 percent. As I said its a recommendation. Because no one really tests them going higher your going into unknowin territory. Ask yourself this would you buy a psu from a manufacturer that you don't know much of or don't know how their products are and without seeing a review? Although a manufacturer might be familiar does it mean they make a good psu? I thought the last few years and the psu manufacturers been lifted out and seperate the good from the bad by actual testing by respectable sites wouldve taught us something. Look at the OP he came and ask here coz he wasn't sure and didn't trust any psu manufacturer. But he's taking the word of a ups manufacturer.
post #46 of 62
Or This: (30A +5 Rail 60A 12v Rail)
http://www.newegg.com/Product/Produc...-021-_-Product
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post #47 of 62
Here is a site that tests ups devices with the psu

http://translate.google.com/translat...Ftower%2F28176

Quote:
Working in conjunction with UPSIn conjunction with APC SmartUPS SC 620 block worked with the load to 362 watts in power from the network, but when switching to battery UPS shuts down after 2-3 seconds at a load of 350 watts and in 5-7 seconds - at a load of 300 watts.Thus, compatibility with UPS - bad, we recommend using UPS or a considerable margin of power, either with sinusoidal output voltage.

Edited by Spooony - 5/21/11 at 4:14pm
post #48 of 62
Quote:
Originally Posted by Spooony View Post
Does that mean your power draw is high? No. Remember 60 percent is not a exact. but in the industry they assume 60 percent. As I said its a recommendation. Because no one really tests them going higher your going into unknowin territory. Ask yourself this would you buy a psu from a manufacturer that you don't know much of or don't know how their products are and without seeing a review? Although a manufacturer might be familiar does it mean they make a good psu? I thought the last few years and the psu manufacturers been lifted out and seperate the good from the bad by actual testing by respectable sites wouldve taught us something. Look at the OP he came and ask here coz he wasn't sure and didn't trust any psu manufacturer. But he's taking the word of a ups manufacturer.
I never said it meant anything. I do know the specs for the UPS say 900W, and power factor on everything these days is active and around .99. In the long run, everyone benefits from power factors closer to one.
 
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post #49 of 62
Thread Starter 
Quote:
Originally Posted by u3b3rg33k View Post
I never said it meant anything. I do know the specs for the UPS say 900W, and power factor on everything these days is active and around .99. In the long run, everyone benefits from power factors closer to one.
Power factor on things like wall warts (those little AC adapters for switches, modems, etc.) and laptop power bricks etc. are usually still really bad.
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post #50 of 62
Quote:
Originally Posted by u3b3rg33k View Post
I never said it meant anything. I do know the specs for the UPS say 900W, and power factor on everything these days is active and around .99. In the long run, everyone benefits from power factors closer to one.
lol didnt mean it that way. Just made a example. Yes thats the scenario we want but what will the pfc be with a ups in the line? They do post the powerfactor when on a load tester but as you can see with a ups connected things change. Remember also we are not reffering to ups running of mains we are refering to when it got to switch to batteries. It might run fine of mains thats expected. But thats not its job really. When it needs to do its job when the power goes will it hold up? Thats why we use them. For the backup purposes. Have you ever tested your one on its batteries?
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