×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

UPS Losses and Efficiencies

UPS Losses and Efficiencies

UPS Losses and Efficiencies

(OP)
1.- How can I estimate the losses and/or efficiencies of uniterruptible power supplies.
2.- Any good links on the web

RE: UPS Losses and Efficiencies

These values should be available from your UPS manufacturer, based on kVA, input filter or no, etc.

Mike

RE: UPS Losses and Efficiencies

(OP)
Sure!!!!!!,but usually they are not forthcoming or really do not make sense.

RE: UPS Losses and Efficiencies

One thing to look at is the input power requirement.  The UPS will generally have an output rating and an input kVA or amperage rating.  

If you are talking about larger commercial-grade UPS, the specifications should include this data, as well as efficiency.  

RE: UPS Losses and Efficiencies

Not forthcoming??  I don't know if you're buying a UPS(static or rotary), but if they won't give you the info., I wouldn't give them your business.  As for not making sense, I've not run across an equipment spec. that didn't.

Mike

RE: UPS Losses and Efficiencies

The major UPS manufacturers all publish efficiency ratings for their UPS systems.

RE: UPS Losses and Efficiencies

(OP)
The article by Bartos points out exactly what I am experiencing. The manufacturers data is published based on UPS loading factors above 50%. A lot of the configurations nowadays are in N+1 ,etc therefore having these units in 25-60% range. Manufacturers do not provide data at this range.

RE: UPS Losses and Efficiencies

As I read the article, and what you're pointing out about 25-60% operation, part of that can be controlled by knowing your equipment and designing to real world load data(I think we've all seen that typically, loads are 1/3 what they really are.)  However, I believe I have seen the data you are inquiring about from my UPS vendor.  I'm confused as to why you're having difficulty.

Mike

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources