?
Solved

VA and Watt

Posted on 2004-03-27
4
Medium Priority
?
15,153 Views
Last Modified: 2012-06-27
The ups write 600 VA how can I convert to Watt
0
Comment
Question by:teera
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 69

Assisted Solution

by:Callandor
Callandor earned 200 total points
ID: 10697242
Multiply the VA by 0.625 and you should have the watt rating.  See http://www.apcc.com/products/runtime_for_extendedruntime.cfm?upsfamily=21
0
 
LVL 14

Assisted Solution

by:tmj883
tmj883 earned 400 total points
ID: 10698318
When measuring DC, the Watt and the Volt Ampere are equivalent. When measuring AC, the Volt Ampere is a measure of the apparent power and works as Callandor states above approximately.
T
0
 
LVL 31

Accepted Solution

by:
rid earned 600 total points
ID: 10699289
Power in AC circuits is V times A times the cosine of the phase shift. Thus you can have an appliance that takes several amps at 230v, but if a phase shift is introduced, (e.g. motors) the real power will perhaps be very low. Still, from the viewpoint of the power supply, it still has to deliver a certain amount of current into the load. Using VA is then a much better way of describing the limits of the power supply (or the drain of the appliance) W is useful only for DC or pure resistive loads, like lightbulbs or heaters, in AC circuits.

/RID
0
 
LVL 12

Assisted Solution

by:public
public earned 200 total points
ID: 10700319
>Power in AC circuits is V times A times the cosine of the phase shift.
This does not really apply to UPS's when the load is a power supply, since the current is not a sine wave.
There is no universal conversion. Depending on the type of load, you can estimate the needed rating.
0

Featured Post

Simplifying Server Workload Migrations

This use case outlines the migration challenges that organizations face and how the Acronis AnyData Engine supports physical-to-physical (P2P), physical-to-virtual (P2V), virtual to physical (V2P), and cross-virtual (V2V) migration scenarios to address these challenges.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Great sound, comfort and fit, excellent build quality, versatility, compatibility. These are just some of the many reasons for choosing a headset from Sennheiser.
This article will show how Aten was able to supply easy management and control for Artear's video walls and wide range display configurations of their newsroom.
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question