Solved

APC Smart UPS 1400XL

Posted on 2008-06-24
2
2,519 Views
Last Modified: 2013-12-11
the way I understand the APC UPS is that with a 1400XL, I can plug 1400 watts of power into it.    My confusion is this UPS is running at 60% load when I have a HP Proliant ML350 G2 with redundant power supplies plugged in.    According to the documentation, each power supply is 700 watts.   With both power supplies plugged in, this UPS should be at 100%.    What am I missing?
0
Comment
Question by:drichard16
[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
2 Comments
 
LVL 69

Accepted Solution

by:
Callandor earned 250 total points
ID: 21860293
First, a 1400XL is rated for 1400VA, which is not the same as 1400 watts.  You multiply the VA by the efficiency rating to get the watts it can handle, which is typically 0.7, so that APC unit can handle 1400 * 0.7 = 980 watts.

Second, a power supply does not run at maximum capacity when it doesn't need to - your total load is less than the maximum 700 watts of the power supply, and depends on what is in the system.  Use a Kill-A-Watt device to measure actual power usage during operation.

Third, redundant power supplies do not draw maximum current simultaneously; they are designed to switch over to the working one when the other fails.
0
 
LVL 32

Assisted Solution

by:aleghart
aleghart earned 250 total points
ID: 21860830
The rating for the 1400XL is 1050 Watts / 1400 VA:

http://apc.com/resource/include/techspec_index.cfm?base_sku=SU1400RMXLB3U&total_watts=50

The LED bar segments indicate: 17, 33, 50, 67, and 85% load.  Your actual load will lie between the highest light bar and the lowest unlit bar.


Also, for the ML350 G2 I see a rating of 350W per hot-pluggable power supply.  I believe the default configuration ships with one:

http://bizsupport.austin.hp.com/bc/docs/support/SupportManual/c01129717/c01129717.pdf

0

Featured Post

[Webinar] How Hackers Steal Your Credentials

Do You Know How Hackers Steal Your Credentials? Join us and Skyport Systems to learn how hackers steal your credentials and why Active Directory must be secure to stop them. Thursday, July 13, 2017 10:00 A.M. PDT

Question has a verified solution.

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

Hello It is a very old trick to use a ram disk in order to boost PC performances, in the past, when in home environments the fastest common devices were floppy disks a part of the very small ram memory available was used to create a virtual hard …
This article applies to This article will be of use if you are the owner / supporter of any computer that comes with a discrete graphics card from nVidia / ATI Radeon (Now owned by AMD) or any embedded graphics solution and need to upgrade the gr…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…

717 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