Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: UPS VA Rating

26 Apr 2011   #1
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 
UPS VA Rating

When an UPS has both surge and backup/surge outlets, does the VA or wattage ratings include both, or only the ones that run on battery?


My System SpecsSystem Spec
.
26 Apr 2011   #2
SledgeDG

Windows 7 Ultimate x86
 
 

I'd have to make an educated guess but from the logical POV it seems like those ratings apply to the battery buffered outlets only since the others are basically just extended, unbuffered wall outlets.

You'll find that whatever is connected to those ports shuts down if you pull the main plug on the UPS

-DG
My System SpecsSystem Spec
26 Apr 2011   #3
Mike Connor

Several, including Windows 7 x64 Ultimate
 
 

Quote   Quote: Originally Posted by seekermeister View Post
When an UPS has both surge and backup/surge outlets, does the VA or wattage ratings include both, or only the ones that run on battery?
That depends on the UPS.

The VA ratings are not the same as the Wattage ratings ( strange as this may seem! VA is different to Watt. The VA specs are for complex power. Watt = real or active power.

You may find this of interest;

AC power - Wikipedia, the free encyclopedia

Uninterruptible Power Supply (UPS) FAQ

Regards....Mike Connor
My System SpecsSystem Spec
.

26 Apr 2011   #4
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Quote   Quote: Originally Posted by SledgeDG View Post
I'd have to make an educated guess but from the logical POV it seems like those ratings apply to the battery buffered outlets only since the others are basically just extended, unbuffered wall outlets.

You'll find that whatever is connected to those ports shuts down if you pull the main plug on the UPS

-DG
I'm sure that you are right about the surge outlet going dead when the UPS is unplugged, but I also read on at least one UPS, that 2 out of the 4 surge outlets are switched off when the PC was shutdown.
My System SpecsSystem Spec
26 Apr 2011   #5
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Quote   Quote: Originally Posted by Mike Connor View Post
Quote   Quote: Originally Posted by seekermeister View Post
When an UPS has both surge and backup/surge outlets, does the VA or wattage ratings include both, or only the ones that run on battery?
That depends on the UPS.

The VA ratings are not the same as the Wattage ratings ( strange as this may seem! VA is different to Watt. The VA specs are for complex power. Watt = real or active power.

You may find this of interest;

AC power - Wikipedia, the free encyclopedia

Uninterruptible Power Supply (UPS) FAQ

Regards....Mike Connor
Different, but it seems that there is a ratio between them that is constant, so for all practical purposes they are the same.
My System SpecsSystem Spec
26 Apr 2011   #6
Mike Connor

Several, including Windows 7 x64 Ultimate
 
 

Quote   Quote: Originally Posted by seekermeister View Post
Quote   Quote: Originally Posted by Mike Connor View Post
Quote   Quote: Originally Posted by seekermeister View Post
When an UPS has both surge and backup/surge outlets, does the VA or wattage ratings include both, or only the ones that run on battery?
That depends on the UPS.

The VA ratings are not the same as the Wattage ratings ( strange as this may seem! VA is different to Watt. The VA specs are for complex power. Watt = real or active power.

You may find this of interest;

AC power - Wikipedia, the free encyclopedia

Uninterruptible Power Supply (UPS) FAQ

Regards....Mike Connor
Different, but it seems that there is a ratio between them that is constant, so for all practical purposes they are the same.
They are not the same. Not in any way at all. There are no ratios or anything else similar between them. They use different SI. Units ;

http://en.wikipedia.org/wiki/Interna...ystem_of_Units

and are calculated differently.

1 W = 1 J/s.

1 Watt = = 1 Volt • 1 Ampere


A volt-ampere (VA) is the unit used for the apparent power in an electrical circuit.


Regards....Mike Connor
My System SpecsSystem Spec
26 Apr 2011   #7
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

You may be right, but every 1000VA UPS that I have seen, always had 600 watts of power. It seems that this was true of other units also (in terms of a ratio), but I could be wrong.
My System SpecsSystem Spec
26 Apr 2011   #8
Mike Connor

Several, including Windows 7 x64 Ultimate
 
 

Quote   Quote: Originally Posted by seekermeister View Post
You may be right, but every 1000VA UPS that I have seen, always had 600 watts of power. It seems that this was true of other units also (in terms of a ratio), but I could be wrong.
The results are specifically dependent on the equipment,how much power it uses, and how it uses it. There is no "ratio" of Watt to VA. They are totally different things.

The three units concerned here are;

W ( Watt )
VA ( VoltAmpere)
var (Volt-ampere reactive )

Only effective power, the actual power delivered to or consumed by the load, is expressed in watts. Imaginary power is properly expressed in volt-amperes reactive.

While both the volt-ampere (abbreviated VA) and the watt have the dimension of power (time rate of energy), they do not have the same meaning. Some devices, including Uninterruptible Power Supplies (UPSs), have ratings both for maximum VAs and maximum watts.
The VA rating is limited by the maximum permissible current, and the watt rating by the power-handling capacity of the device. When a UPS powers equipment which presents a reactive load with a low power factor (e.g., a computer), neither limit may safely be exceeded.[3]


Quoted from; Volt-ampere - Wikipedia, the free encyclopedia


Regards....Mike Connor
My System SpecsSystem Spec
26 Apr 2011   #9
Phone Man

Windows 8.1 Pro w/Media Center 64bit, Windows 7 HP 64bit
 
 

I have a APC 750VA that is rated at 450 watts and this rating is for the UPS output only. It has 5 UPS outlets and 5 surge only outlets. Three of the surge only outlets can be setup to turn on/off by monitoring one of the UPS outlets marked Master. If it sees 0 power draw on the Master outlet it will turn off these 3 outlets. This feature can be turned off if not needed. At present all of my computer stuff (PC, LCD Monitor, Cable Modem, Router, Vontage Unit, Wireless Phone System) is on the UPS ports and I draw 148 Watts. I also have a scanner and when it is scanning I hit 170 Watts. We are always having power hits during rain storms my UPS system is great. I also have one on each of my TV systems.

-apc.png


Jim


My System SpecsSystem Spec
26 Apr 2011   #10
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Quote   Quote: Originally Posted by Mike Connor View Post
Quote   Quote: Originally Posted by seekermeister View Post
You may be right, but every 1000VA UPS that I have seen, always had 600 watts of power. It seems that this was true of other units also (in terms of a ratio), but I could be wrong.
The results are specifically dependent on the equipment,how much power it uses, and how it uses it. There is no "ratio" of Watt to VA. They are totally different things.

The three units concerned here are;

W ( Watt )
VA ( VoltAmpere)
var (Volt-ampere reactive )

Only effective power, the actual power delivered to or consumed by the load, is expressed in watts. Imaginary power is properly expressed in volt-amperes reactive.

While both the volt-ampere (abbreviated VA) and the watt have the dimension of power (time rate of energy), they do not have the same meaning. Some devices, including Uninterruptible Power Supplies (UPSs), have ratings both for maximum VAs and maximum watts.
The VA rating is limited by the maximum permissible current, and the watt rating by the power-handling capacity of the device. When a UPS powers equipment which presents a reactive load with a low power factor (e.g., a computer), neither limit may safely be exceeded.[3]


Quoted from; Volt-ampere - Wikipedia, the free encyclopedia


Regards....Mike Connor
Your posts definitely demonstrate a superior knowledge to my own, and are educational, but then I only understand a fraction of what you have said, so it still leaves me going in circles. Despite all of the theory and equations, are there any 1000VA UPSs that aren't also rated at 600 watts?
My System SpecsSystem Spec
Reply

 UPS VA Rating




Thread Tools




Similar help and support threads
Thread Forum
PSU rating for mobo/cpu
I have recently upgraded (open to debate), to an Intel I5 3570k setup. I am carrying over my 700w OZC Stealth Xtreme II to this setup. I am giving my old kit to my children whos C2D 6320 gave up the ghost. I have spare, an Aopen 450w PSU, would this be enough to power the following, all at stock...
Hardware & Devices
CPU WEI rating getting lower?
Hi, today I thought that I haven't updated my WEI some time and ran the assessment. Now all of a sudden my processor's rating dropped from 7.7 to 7.6. Is that normal that it drops for some strange reason or what might be causing this? Thanks!
Performance & Maintenance
HDD only gets a 7 rating of 5.9
how do i get a higher score than 5.9 on my hdd as that the only thing holding back my score from being 7.3? i heard i need a SSD to get it higher is this correct?
Performance & Maintenance
Rep Rating
I have gone to the Sticky that describes how Reputation and Badges are earned. I have done this three or four times since I have been on the board and never have quite grasped the formula. I just had a few spare minutes and decided I was going to give it a go again. I read it and reread it. ...
Chillout Room
Can't get a WEI rating.
Has anyone had a problem getting a Windows Experience Index rating? I keep trying to get one and it won't work. The progress bar moves about 5% of the way and then stops. I have closed all running programs and let it sit for an hour. Task manager shows WinSAT.exe at 0% CPU usage. Any ideas? ...
General Discussion
I like 7 so far, my rating 7.5/10
Been running XP Pro 32 forever. Installed Windows 7 on a second hard drive with the following core following components. Asus M3A78-EM motherboard AMD Athlon(tm) 64 X2 Dual Core Processor 3800+(2x2Ghz.) 4GB. of of DDR2 memory. I like what I see in Windows 7 so far, and the performance...
General Discussion


Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 03:50.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App