Upload
raj-chavan
View
221
Download
2
Embed Size (px)
Citation preview
7/27/2019 How to Calculate UPS Battery Backup _ Backup HowTo
1/5
8/8/13 How to calculate UPS battery backup | Backup HowTo
www.backuphowto.info/how-calculate-ups-battery-backup
Home
Advertise Here
Advertise Here
Backup HowToTips and articles about backup
How to calculate UPS battery backupMarch 4, 2009 - 11:55 | Munteanu Sabina
It is nearly impossible to know when the next power outage will occur and frankly, they can be
rather damaging unless you have the tendency to save your work every 2 minutes. I remember
I have been working on this Photoshop file for nearly two hours, and a power outage came and
erased everything I worked on the next day I went to the market and bought an UPS. Now,
before I bore you with useless stories let us see what you can find within this article:
The answer to the popular question how to calculateups battery back-upWhat is an UPS with friendl detailsWhat t es of UPS ou can find on the market
Introduction to the UPS battery back up
UPS (Uninterruptible Power Supply) systems have been built to compensate for those power
outages and to help you save your system and your work. You might have found out by now
that those sudden changes in voltages can affect your computer it can damage your powersystem along with your main board and CPU. Aside from this, it can produce light damage to
your hard drives and other devices you have in your computer. The bottom line is power
outages are harmful for both your work and your PC. The thing is, UPS have become quite
useful especially nowadays when they can have up to one hour battery back-up which gives you
enough time to complete your work and shut down the computer safely. However, how does a
UPS work? Simple, when your power line distributes power within normal parameters, the UPS
stores power, therefore whenever a power outage occurs UPSes act like a battery (similar to
the back-up battery existing in laptops, only larger and based on a different principle).
[inline:1]
Any UPS system is placed between your equipment and the power socket. When electricity
flows from the socket to the UPS and then to the computer, the battery is continuously checking
power levels, and collecting power at the same time. When the electricity flow is not within
normal parameters anymore, the UPS will start compensating for the lack of power by
connecting the batteries. Once the power flow has been restored, the UPS will start recharging
its batteries again. Owning an UPS, battery back up will not only protect you from poweroutages, but also from changes in the power flow (lower voltage may damage your
components too).
Types of UPS battery back-up
The market is full of UPS battery back-up systems and some of them have different purposes.
Here are the two most popular types you can find on the market at any time:
Offline UPS Offline UPS battery back-up systems work similar to laptop batteries. Oncethe power source is removed, they kick in and supply the needed amount of power, andonce the power outage is removed, the UPS goes back to recharging its batteries. The onlyinconvenience he re is the fact that when power is restored, the UPS temporarily closes thetransfer of power bet ween the computer and the source thus making it an unreliable choicein man cases.
Online UPS This is one of the most reliable types of UPS battery back-up systems sincethey provide e lectricity at any t ime, w ithout any closing dow n of powe r transfers (similar tothe offline UPS). Basically, an online UPS will not only protect your computer for power
outa es but also from volta e irre ularities.
5 Kva UPS
APCIndiaStore.com/BestPrice
Designed for Harsh IndianPower Conditions. 2Yrs
Warranty. Buy Now!
100% Free DataSheet
(PDF)
www.AllDataSheet.com
Over 20000000 DataSheet. It'sFree. Multi Fast Search System.
Search
About Munteanu Sabina
AboutTall, insane programmer,photographer and reader
Homepagehttp://arcsine.wordpress.com/about/
Full nameMunteanu Sabina
View full user profile
Poll
Older polls Results
Do you backup yourphone?
Yes
No
I don't know how
Vot e
Popular content
Today's:
How to backup Android
(and HTC Hero) phone
How to Backup MySQL
Database automatically (for
Linux users)
How to backup and restore
data and e-mail account
sett ings in Outlook 2007
All time:
How to backup iPhone
How to backup Android
(and HTC Hero) phone
How to backup your iTunes
Library onto an external
hard drive?
Last viewed:
How to backup Android
(and HTC Hero) phone
How to Backup MySQL
Database automatically (for
Linux users)
Linux Backup: Hard Disk
Clone w ith "dd"
User login
Username *
Password *
Create new account
Request new password
Log in
Recent comments
ways to back up hard disk
2 years 5 months ago
ups backup time formula 2
years 5 months ago
HTC Desire Hd SD card
problem 2 years 6 months
ago
Re: samsung i5510 2 years
6 months ago
PLZ HELP ME 2 years 6
months ago
VeryAndroid SMS Backup 2
years 6 months ago
Hope t his can help. 2 years
6 months ago
Battery capacity varies with
load 2 years 6 months ago
Re: Outlook 2007 backup
2 years 6 months ago
This article agrees roughly 2
years 8 months ago
News on our websites
5 Natural Lighting Tips That
You Shou ld Be Pract icing
This Spring's Aw esome
Feature - Landscape
Photography
Improving Product Quality
8 Tips To Get Y ou Started
More
Home Backup How-To's Backup software Online backup Others Forum Contact About Recent posts
http://buysellads.com/buy/detail/36520/zone/1251701?utm_source=site_36520&utm_medium=website&utm_campaign=adhere&utm_content=zone_1251701http://buysellads.com/buy/detail/36520/zone/1251701?utm_source=site_36520&utm_medium=website&utm_campaign=adhere&utm_content=zone_1251701http://www.backuphowto.info/users/munteanu-sabinahttp://buysellads.com/buy/detail/36520/zone/1251701?utm_source=site_36520&utm_medium=website&utm_campaign=adhere&utm_content=zone_1251701http://buysellads.com/buy/detail/36520/zone/1251701?utm_source=site_36520&utm_medium=website&utm_campaign=adhere&utm_content=zone_1251701http://www.googleadservices.com/pagead/aclk?sa=L&ai=CzcE5nc8DUuD7I-POigehyIEYtdPJ8QOl_OryUsCNtwEQASCZ5rEIUP6D-9z6_____wFg5ermg7wOoAGTiv3pA8gBAakCXD1kc-auUT6oAwHIA9MEqgSYAU_QDVdQ5Px81jGiVRHMmQS2BOAxF7XGk9Q2g8voM3BfqMzNnCJAXVGqWbMlHAJOyBknvVLphS9tdq6kL9Jkj5oLTBUZzNyjQoFu2YAm-g7kCwAxP9dm_1DAev32JUaIJ8nQbWTGvE_zIw9OrW2dHKpgehEqN2pL-nXRzFl25DqRBRT_6NYnJOIRPdYjakyK0ltW9J-LDs5RiAYBgAfV9YIW&num=1&cid=5GjQv6L-mOOl_GM0lTbzhPkB&sig=AOD64_0NeVYMqmcX_bIKF9reD3l6e11oow&client=ca-pub-2330993466084029&adurl=http://www.apcindiastore.com/july13/apc_smartups/%3Futm_source%3Dgoogleadchakra%26utm_medium%3Dcpc%26utm_content%3Dtextads%26utm_campaign%3Dsmartups&nm=9http://www.googleadservices.com/pagead/aclk?sa=L&ai=CJsprns8DUv3lNIq9igeBpoGoD7T294cDgNmS5ArAjbcBEAEgmeaxCFCxqPWn______8BYOXq5oO8DqABiJH58wPIAQGoAwHIA9MEqgSUAU_QqB4K7nsB0Fk64v6yC3Pe4z4YoZkEi0qYDATWZvifsgCB8rx7U-7QXKikZH_BKoLpnDJ2eRTE2r-XUD0EfjgF1kpCnpXLe9xRzALFMOMxxUlTC1GnOszT8qFjlJjYMHbvq_eD4t9bcZ9fF67sJSCljryG0zmSqfKQxN-qwblEPSOlFkvv6RTqPuIhaaSGUvXYMyCIBgGAB-Duhgw&num=1&cid=5GjLLc-Q2LbYquC917UGXrdI&sig=AOD64_3MRXYIV4HmsFN5Q10YIhCNFyNSaQ&client=ca-pub-2330993466084029&adurl=http://www.alldatasheet.com&nm=6http://buysellads.com/buy/detail/36520/zone/1251701?utm_source=site_36520&utm_medium=website&utm_campaign=adhere&utm_content=zone_1251701http://www.backuphowto.info/users/munteanu-sabinahttp://www.backuphowto.info/http://www.backuphowto.info/category/articles/backup-how-toshttp://www.backuphowto.info/category/articles/backup-softwarehttp://www.backuphowto.info/category/articles/online-backuphttp://www.backuphowto.info/category/articles/othershttp://www.backuphowto.info/forumhttp://www.backuphowto.info/contacthttp://www.backuphowto.info/abouthttp://www.backuphowto.info/trackerhttp://www.backuphowto.info/http://www.backuphowto.info/http://www.backuphowto.info/trackerhttp://www.backuphowto.info/abouthttp://www.backuphowto.info/contacthttp://www.backuphowto.info/forumhttp://www.backuphowto.info/category/articles/othershttp://www.backuphowto.info/category/articles/online-backuphttp://www.backuphowto.info/category/articles/backup-softwarehttp://www.backuphowto.info/category/articles/backup-how-toshttp://www.backuphowto.info/http://www.backuphowto.info/aggregator/categories/1http://www.photohowto.info/improving-product-quality-8-tips-get-you-startedhttp://www.photohowto.info/springs-awesome-feature-landscape-photographyhttp://www.photohowto.info/5-natural-lighting-tips-you-should-be-practicinghttp://www.backuphowto.info/comment/838#comment-838http://www.backuphowto.info/comment/868#comment-868http://www.backuphowto.info/comment/869#comment-869http://www.backuphowto.info/comment/870#comment-870http://www.backuphowto.info/comment/871#comment-871http://www.backuphowto.info/comment/874#comment-874http://www.backuphowto.info/comment/875#comment-875http://www.backuphowto.info/comment/876#comment-876http://www.backuphowto.info/comment/878#comment-878http://www.backuphowto.info/comment/881#comment-881http://www.backuphowto.info/user/passwordhttp://www.backuphowto.info/user/registerhttp://www.backuphowto.info/linux-backup-hard-disk-clone-ddhttp://www.backuphowto.info/how-backup-mysql-database-automatically-linux-usershttp://www.backuphowto.info/how-backup-android-and-htc-hero-phonehttp://www.backuphowto.info/how-backup-your-itunes-library-external-hard-drivehttp://www.backuphowto.info/how-backup-android-and-htc-hero-phonehttp://www.backuphowto.info/how-to-backup-iphonehttp://www.backuphowto.info/how-to-backup-restore-data-e-mail-account-settings-outlook-2007http://www.backuphowto.info/how-backup-mysql-database-automatically-linux-usershttp://www.backuphowto.info/how-backup-android-and-htc-hero-phonehttp://www.backuphowto.info/node/186/resultshttp://www.backuphowto.info/pollhttp://www.backuphowto.info/users/munteanu-sabinahttp://arcsine.wordpress.com/about/http://www.google.com/url?ct=abg&q=https://www.google.com/adsense/support/bin/request.py%3Fcontact%3Dabg_afc%26url%3Dhttp://www.backuphowto.info/how-calculate-ups-battery-backup%26gl%3DIN%26hl%3Den%26client%3Dca-pub-2330993466084029%26ai0%3DCJsprns8DUv3lNIq9igeBpoGoD7T294cDgNmS5ArAjbcBEAEgmeaxCFCxqPWn______8BYOXq5oO8DqABiJH58wPIAQGoAwHIA9MEqgSUAU_QqB4K7nsB0Fk64v6yC3Pe4z4YoZkEi0qYDATWZvifsgCB8rx7U-7QXKikZH_BKoLpnDJ2eRTE2r-XUD0EfjgF1kpCnpXLe9xRzALFMOMxxUlTC1GnOszT8qFjlJjYMHbvq_eD4t9bcZ9fF67sJSCljryG0zmSqfKQxN-qwblEPSOlFkvv6RTqPuIhaaSGUvXYMyCIBgGAB-Duhgw&usg=AFQjCNE-M9o1uOnEkbfyjsK9BowRnzYrMghttp://www.googleadservices.com/pagead/aclk?sa=L&ai=CJsprns8DUv3lNIq9igeBpoGoD7T294cDgNmS5ArAjbcBEAEgmeaxCFCxqPWn______8BYOXq5oO8DqABiJH58wPIAQGoAwHIA9MEqgSUAU_QqB4K7nsB0Fk64v6yC3Pe4z4YoZkEi0qYDATWZvifsgCB8rx7U-7QXKikZH_BKoLpnDJ2eRTE2r-XUD0EfjgF1kpCnpXLe9xRzALFMOMxxUlTC1GnOszT8qFjlJjYMHbvq_eD4t9bcZ9fF67sJSCljryG0zmSqfKQxN-qwblEPSOlFkvv6RTqPuIhaaSGUvXYMyCIBgGAB-Duhgw&num=1&cid=5GjLLc-Q2LbYquC917UGXrdI&sig=AOD64_3MRXYIV4HmsFN5Q10YIhCNFyNSaQ&client=ca-pub-2330993466084029&adurl=http://www.alldatasheet.com&nm=6http://www.google.com/url?ct=abg&q=https://www.google.com/adsense/support/bin/request.py%3Fcontact%3Dabg_afc%26url%3Dhttp://www.backuphowto.info/how-calculate-ups-battery-backup%26gl%3DIN%26hl%3Den%26client%3Dca-pub-2330993466084029%26ai0%3DCzcE5nc8DUuD7I-POigehyIEYtdPJ8QOl_OryUsCNtwEQASCZ5rEIUP6D-9z6_____wFg5ermg7wOoAGTiv3pA8gBAakCXD1kc-auUT6oAwHIA9MEqgSYAU_QDVdQ5Px81jGiVRHMmQS2BOAxF7XGk9Q2g8voM3BfqMzNnCJAXVGqWbMlHAJOyBknvVLphS9tdq6kL9Jkj5oLTBUZzNyjQoFu2YAm-g7kCwAxP9dm_1DAev32JUaIJ8nQbWTGvE_zIw9OrW2dHKpgehEqN2pL-nXRzFl25DqRBRT_6NYnJOIRPdYjakyK0ltW9J-LDs5RiAYBgAfV9YIW&usg=AFQjCNGBysMGJ4O9AqboAA_jiLdgzEJlTghttp://www.googleadservices.com/pagead/aclk?sa=L&ai=CzcE5nc8DUuD7I-POigehyIEYtdPJ8QOl_OryUsCNtwEQASCZ5rEIUP6D-9z6_____wFg5ermg7wOoAGTiv3pA8gBAakCXD1kc-auUT6oAwHIA9MEqgSYAU_QDVdQ5Px81jGiVRHMmQS2BOAxF7XGk9Q2g8voM3BfqMzNnCJAXVGqWbMlHAJOyBknvVLphS9tdq6kL9Jkj5oLTBUZzNyjQoFu2YAm-g7kCwAxP9dm_1DAev32JUaIJ8nQbWTGvE_zIw9OrW2dHKpgehEqN2pL-nXRzFl25DqRBRT_6NYnJOIRPdYjakyK0ltW9J-LDs5RiAYBgAfV9YIW&num=1&cid=5GjQv6L-mOOl_GM0lTbzhPkB&sig=AOD64_0NeVYMqmcX_bIKF9reD3l6e11oow&client=ca-pub-2330993466084029&adurl=http://www.apcindiastore.com/july13/apc_smartups/%3Futm_source%3Dgoogleadchakra%26utm_medium%3Dcpc%26utm_content%3Dtextads%26utm_campaign%3Dsmartups&nm=9http://www.backuphowto.info/users/munteanu-sabinahttp://www.backuphowto.info/http://buysellads.com/buy/detail/36520/zone/1251701?utm_source=site_36520&utm_medium=website&utm_campaign=adhere&utm_content=zone_1251701http://buysellads.com/buy/detail/36520/zone/1251701?utm_source=site_36520&utm_medium=website&utm_campaign=adhere&utm_content=zone_1251701http://www.backuphowto.info/7/27/2019 How to Calculate UPS Battery Backup _ Backup HowTo
2/5
8/8/13 How to calculate UPS battery backup | Backup HowTo
www.backuphowto.info/how-calculate-ups-battery-backup
Tags: UPS
Art icles: Others
How to calculate ups battery backup
When I first asked this question myself, a friend of mine kindly sent me to the manual (a joke,
obviously). In the meantime, I found out that calculating ups batter back up is not such a big
deal as I might have thought in the first place. In order to make everything as clear as I can, I
will use a small example. Let us assume the following ideas:
Inverter efficiency of UPS battery is 90% (the norm is somewhere between 90% and 98%)Battery end point voltage 1.67 (usually specified on the UPS itself, or in its manual)
Environmental tem erature 77F
Assuming that we know the following things about our UPS : one string of batteries, 30 each,
UPS rating 40kW and 6 cells per unit, we can break down the calculations in three steps:
1.) Actual battery load for 40kW
40kW 90% efficiency means an actual 44.4kW load
(you can calculate this by dividing the rating of the UPS by inverter efficiency 40/0.9 =
44.4kW)
2.) Watts per Battery
44.4kw (previously calculated) will be divided by the number of batteries we have available, and
the result will lead to 1481 watts per battery.
(you can calculate this using the equation: 44.4Kw/30 = 1481W)
3.) Watts per each Cell
Giving the necessary data we will deduct that each cell needs 247W.
(calculate this using the equation: 1481W / 6 (the number of cells per unit) = 247 watts per
each cell)
Now we can easily estimate the run-time of your UPS battery back up system. Giving the fact
that we know that each batter has about 247W per each cell, and we have a battery end point
voltage of 1.67V your run time should be somewhere between 45 minutes and 60 minutes.
Bookmark/Search this post with
Share on Facebook1
TweetTweet 3
>Log in or register to post comments
Luminous Inverters
Looking For Super Brand UPS. Go For Luminous, Buy it Now!
www.myluminousindia.com
Previous && next articles
PermalinkSubmitted by Kamal Ahmad (not verified) on August 20, 2009 - 00:00.
PermalinkSubmitted by jignesh (not verified) on August 25, 2009 - 08:37.
PermalinkSubmitt ed by aongola (not verified) on November 12, 2009 - 08:48.
Comments
ups backup time
Can you help me how you calculate the back up time from 45 to 60 miutes
can you provide me with the equation
Log in or register to post comments
how to calculate 45 minute to 60 minute.
how can u calculate 45 minute to 60 minute?
Log in or register to post comments
backup culculations
I would urge the auther to varify the culculations and the procedure used,i have a load of
15KVA which must be kept active for 2 hrs in case of power failure. with this info i cannot use
your procedures to culculate the Ahr for the battery requires.Below wil be of more use to fellow
engineers:
Number of batteries = N =20
Voltage of each battery = V = 12 V
Ampere-hour of each battery (AH) = X
Number of Operational hours = T = 2 hrs
AmazonS3 backup
storage of#Joomla site
set up in minutes, thanks
to @akeebabackup
Retweeted by
BackupHowTo
The Iron
Chicken
@TheIronChicken
Expand
BackupHowTo
4 Jan
26 Dec
Tweets FollowFollow
Tweet to @BackupHowTo
http://www.backuphowto.info/comment/520#comment-520http://www.backuphowto.info/comment/520#comment-520http://www.backuphowto.info/comment/520#comment-520http://www.backuphowto.info/comment/520#comment-520http://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/444#comment-444http://www.backuphowto.info/comment/441#comment-441http://www.backuphowto.info/comment/441#comment-441https://twitter.com/intent/tweet?screen_name=BackupHowTohttps://twitter.com/intent/follow?original_referer=&partner=undefined®ion=follow_link&screen_name=BackupHowTo&tw_p=followbutton&variant=2.0https://twitter.com/BackupHowTohttps://twitter.com/BackupHowTo/statuses/283832257876205569https://twitter.com/TheIronChicken/statuses/287245612414545920https://twitter.com/BackupHowTohttps://twitter.com/TheIronChicken/statuses/287245612414545920https://twitter.com/TheIronChickenhttps://twitter.com/BackupHowTohttps://twitter.com/akeebabackuphttps://twitter.com/search?q=%23Joomla&src=hashhttp://www.backuphowto.info/comment/520#comment-520http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/444#comment-444http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/441#comment-441http://www.backuphowto.info/comment/520#comment-520http://www.backuphowto.info/comment/444#comment-444http://www.backuphowto.info/comment/441#comment-441http://www.google.com/url?ct=abg&q=https://www.google.com/adsense/support/bin/request.py%3Fcontact%3Dabg_afc%26url%3Dhttp://www.backuphowto.info/how-calculate-ups-battery-backup%26gl%3DIN%26hl%3Den%26client%3Dca-pub-2330993466084029%26ai0%3DCwjW1n88DUtqCMIjdigfiIt2oyJAE1dPovGHAjbcBEAEgmeaxCFC-0YWv-f____8BYOXq5oO8DqAB66jA4APIAQGpAlw9ZHPmrlE-qAMByAPTBKoEmgFP0G58TjPM4bzyEancvG1IXFEQQQQ9ikR6GCq58tVirnz8G2eVPsc4reB-IevkmW5Tz4jYbzv8dxlPKB-kO2pRMoqOUQ8yb4Le6L9ql9h3D54gQWLP3clxOeVorIWaPpS6_y1KCALFtufcsqkHiiEyUnGlclXhBm-lgVssbG-KEsry55MZ7GOs-_9L94mdF-I7V6V9edQ6E1Q1iAYBgAf91r8f&usg=AFQjCNEPqNo3cFOD_Gu6UxXjieq0k8ZhPghttp://www.googleadservices.com/pagead/aclk?sa=L&ai=CwjW1n88DUtqCMIjdigfiIt2oyJAE1dPovGHAjbcBEAEgmeaxCFC-0YWv-f____8BYOXq5oO8DqAB66jA4APIAQGpAlw9ZHPmrlE-qAMByAPTBKoEmgFP0G58TjPM4bzyEancvG1IXFEQQQQ9ikR6GCq58tVirnz8G2eVPsc4reB-IevkmW5Tz4jYbzv8dxlPKB-kO2pRMoqOUQ8yb4Le6L9ql9h3D54gQWLP3clxOeVorIWaPpS6_y1KCALFtufcsqkHiiEyUnGlclXhBm-lgVssbG-KEsry55MZ7GOs-_9L94mdF-I7V6V9edQ6E1Q1iAYBgAf91r8f&num=1&cid=5GjCAji3rwRk8QkO-3MMQr_U&sig=AOD64_3URmyfEIAh-C3wf22k0HPfKmhp-w&client=ca-pub-2330993466084029&adurl=http://www.myluminousindia.com/%3Futm_source%3Dgoogleadchakra%26utm_medium%3Dsearch%26utm_campaign%3Dmyluminousjune%26utm_keyword%3Dinverter%2520tubular%2520batterieshttp://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/how-backup-using-ccleanerhttp://www.backuphowto.info/useful-tips-about-how-backup-drupal-installationhttp://www.facebook.com/sharer.phphttp://twitter.com/search?q=http%3A%2F%2Fwww.backuphowto.info%2Fhow-calculate-ups-battery-backuphttps://twitter.com/intent/tweet?original_referer=http%3A%2F%2Fwww.backuphowto.info%2Fhow-calculate-ups-battery-backup&text=How%20to%20calculate%20UPS%20battery%20backup&tw_p=tweetbutton&url=http%3A%2F%2Fwww.backuphowto.info%2Fhow-calculate-ups-battery-backuphttp://www.backuphowto.info/category/articles/othershttp://www.backuphowto.info/tags/ups7/27/2019 How to Calculate UPS Battery Backup _ Backup HowTo
3/5
8/8/13 How to calculate UPS battery backup | Backup HowTo
www.backuphowto.info/how-calculate-ups-battery-backup
PermalinkSubmitted by Alaa Noor (not verified) on December 25, 2009 - 02:55.
PermalinkSubmitted by chander (not verified) on January 1, 2010 - 17:12.
PermalinkSubmitted byVanchinathan.P (no t ve rified) on January 5, 2010 - 12:36.
PermalinkSubmitted by Anonymous (not verified) on January 27, 2010 - 07:40.
PermalinkSubmitted by Anonymous (not verified) on January 31, 2010 - 06:57.
PermalinkSubmitted by Anonymous (not verified) on February 25, 2010 - 06:09.
PermalinkSubmitted by Anonymous (not verified) on February 25, 2010 - 06:14.
Volt-Ampere = (N * V * X)/ T
15000 = (20*12*X)/2
15000 = 120X
X= 125 AH
Log in or register to post comments
backup culculations
This calculation does not take into consideation the UPS power factor , and the inverter
effeciancy ,
are you using the batteries to directly supply load ? i.e DC backup system ? or there is a UPS ?
if you are using a DC backup , then simply calculate the load current
A lead acid battery can supply 100% of its rated current for 30min before the voltage drop to
10.5v and become unusable
if you are looking for an hour of backup , limit your load to 60% of the battery rated capacity ,
35% for 2 hours, 25% for 3 hours. assuming temp = 25 degrees C.
example if you require 60A for one hour , then use a 100Ah Battery @ 25 degree C
hope this helps
Log in or register to post comments
battery
hello sir
i want to know one think,how to calculate the number of battery we have to used
Log in or register to post comments
Calculation formula UPS backup time
Sir/Madam,
Please give me the formula for calculating the UPS backup time.
Also explain me the UPS backup time with the below Given details.
Example:
UPS Rating = 1500VA
No. of Batteries = 2
Battery voltage = 12V
Battery rating = 17AH
Log in or register to post comments
UPS Back up time (in Hrs) =
UPS Back up time (in Hrs) = ( DC voltage of battery x AH rating of battery x Efficiency) / VA
rating of UPS
Assuming that efficiency of UPS is 90%, the back up time for your case is as under;
= ( 2 x12 x 17 x 0.9 ) / 1500 = 0.24 hours
Say 15 minutes
Log in or register to post comments
how to calculate the ups battery
I want to know on how to calculate the ups battery, example 40 nos. of ups battery, 12 volts of
each battery, and 40Ah, how many hours can back up if the power supply is failure. please give
me the formula
Log in or register to post comments
Where do you get 15 minutes
Where do you get 15 minutes from YOUR formula dickhead?
Log in or register to post comments
Sorr ....let me clarif m
http://www.backuphowto.info/comment/665#comment-665http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/664#comment-664http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/626#comment-626http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/623#comment-623http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/607#comment-607http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/606#comment-606http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/597#comment-597http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/665#comment-665http://www.backuphowto.info/comment/664#comment-664http://www.backuphowto.info/comment/626#comment-626http://www.backuphowto.info/comment/623#comment-623https://webmail.suzlon.com/owahttp://www.backuphowto.info/comment/607#comment-607http://www.backuphowto.info/comment/reply/154/520http://www.backuphowto.info/comment/606#comment-606http://www.backuphowto.info/comment/597#comment-5977/27/2019 How to Calculate UPS Battery Backup _ Backup HowTo
4/5
8/8/13 How to calculate UPS battery backup | Backup HowTo
www.backuphowto.info/how-calculate-ups-battery-backup
PermalinkSubmitted by Anonymous (not verified) on March 24, 2010 - 00:00.
PermalinkSubmitted by Anonymous (not verified) on May 4, 2010 - 19:30.
PermalinkSubmitt ed by rehan (not verified) on May 13, 2010 - 13:59.
PermalinkSubmitted by Anonymous (not verified) on July 13, 2010 - 16:53.
PermalinkSubmitted by Eq (not verified) on July 30, 2010 - 06:09.
PermalinkSubmitted by epoxy flooring delhi (not verified) on July 30, 2010 - 10:14.
PermalinkSubmitted by epoxy flooring delhi (not verified) on July 30, 2010 - 10:16.
Sorry....let me clarify my last responce....I see where you get the 15 minutes from the actual
formula, but I don't see how you can get 15 minutes. You haven't even considered in your
formula floating voltage and end of discharge voltages.
I,m sorry to point out a truth...but none of you in this forum seem to have any clue!!!
Log in or register to post comments
UPS Verification
hello there! and I hope someone there can help me with this. I followed you formula to find out
how many minutes this UPS will back up. Please let me know what I am doing wrong.UPS specs:
120V AC in and 120V AC.
Battery efficiency: 0.83
Battery: (4) 48V, 12 Ah, Sealed maintenance-free, valve-regulated, lead-acid.
EBM: "External Battery Module"
Battery efficiency: 0.83
Battery: (8) 24V, 9 Ah, Sealed maintenance-free, valve-regulated, lead-acid.
UPS has to hold for 30 minutes this load 1638VA.
formula: UPS Back up time (in Hrs) = ( DC voltage of battery x AH rating of battery x Efficiency)
/ VA
[(48+24) x (12+9)] x .8/1638 = 0.74 hours
about 45 minutes.
However the solution that I got from the UPS selector come back with only 35 minutes. The
reason I am doing this is because I need to show calculation to show that this UPS would hold
the load.
Any help would be very appreciated.
Log in or register to post comments
batteries needed
I am trying to achieve 5-7 minutes of back up time for a 300kVA UPS system. Currently the
system has no batteries and I dont know what size would work at a full load.
Log in or register to post comments
backup calculations
Its not possible to calculate the battery ratting through any formula accurately.
I have tried different formulas but practically they all become false.
Log in or register to post comments
ups back up time
in yr exapmle 20 nos of 125 ah 12 v are connected in series ?
then what will be battery discharge current say at 10000 load
practically taken 10kva is max load connected to this ups
such that what willbe the back up time
Log in or register to post comments
This is only a theory.
This is only a theory. Practically, most UPS just don't last, burning their diodes after 20-30
minutes of power outage. The battery degrades over time as well. The main purpose of suchUPS - just give you couple of minutes to finish and save your work or initiate server shutdown.
If you plan to WORK during power outage, you have to connect gas/diesel generator to UPS. All
outages I remember were very short (minutes) or very long (hours). There is no affordable
UPS that will survive under load for more than hour.
Log in or register to post comments
Nice comment
It is really a nice comment on this post with have a great thought.....
Log in or register to post comments
Good mathematics
http://www.backuphowto.info/comment/773#comment-773http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/772#comment-772http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/771#comment-771http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/765#comment-765http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/718#comment-718http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/710#comment-710http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/690#comment-690http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/665#comment-665http://www.reliancechemicals.in/http://www.backuphowto.info/comment/773#comment-773http://www.reliancechemicals.in/http://www.backuphowto.info/comment/772#comment-772http://www.backuphowto.info/comment/771#comment-771http://www.backuphowto.info/comment/765#comment-765http://www.backuphowto.info/comment/718#comment-718http://www.backuphowto.info/comment/710#comment-710http://www.backuphowto.info/comment/690#comment-6907/27/2019 How to Calculate UPS Battery Backup _ Backup HowTo
5/5
8/8/13 How to calculate UPS battery backup | Backup HowTo
www.backuphowto.info/how-calculate-ups-battery-backup
PermalinkSubmitted by Anonymous (not verified) on August 2, 2010 - 20:37.
PermalinkSubmitted by Mustafa (not verified) on August 19, 2010 - 04:24.
PermalinkSubmitted by tygrus on January 18, 2011 - 03:44.
PermalinkSubmitted by er_satvinder on February 12, 2011 - 23:51.
I find here a good formula on this nice comment
http://www.reliancechemicals.in
Log in or register to post comments
Where do you get 15 minutes
dickhead, 25% of an hour is 15 mins. now no one gonna teach you maths here.
Log in or register to post comments
confused
Hello, Really what a nice Post. Now I really kinda lost because i want to run both my Compaq
laptop and my speed-touch wireless Router for about an Hour, and i really i was hoping if you
can let me know a product that would do it, because i really can't figure it out.
Thanks
Log in or register to post comments
Battery capacity varies with load
Although a battery maybe rated at X amp-hours you will get less than half of that available
when discharged at faster than an hour. A 18Ah @20hr discharge rate can only provide 10.8Ah
for 1hr. Its not that the electrical charge has suddenly disappeared but internal resistance
rises, available voltage drops and the devices shuts off at 10.# volts per 12v SLA battery. Youcould in theory use 7Ah in the first hour then another 7Ah over the next 6hrs but not the other
way around.
The other issue is the non-linear efficiency of the inverter and monitoring circuitry. eg. A 1w
load will still require .8A or ~20w from the battery, 50w requires 70w, 300w requires 330w,
700w requires 742w from a 24v SLA battery using a 1000w inverter. Most efficient near max
load. Inverters may overheat if used at max. load for more than 30mins but the standard
batteries dont last that long at max load. The cheaper the device, the less likely it will handle
the extremes. A 150w inverter will keep a 50w load running longer than a 1000w inverter and
50w load connected to the same size battery. Also, after 2 years and 12 deep discharges (run
flat for >50% load) the battery will have reduced capacity and may be half the runtime. Its
better to start with 20mins and end up with 10, than to start with 6mins and end up with 3mins.
Log in or register to post comments
ups backup time formula
UPS Back up time (in Hrs) = ( No. of DC battery X voltage rating of battery X AH rating of
battery ) / VA of ups installed
= ( 2 x12 x 17 ) / 1500 = 0.272 hours
Say 15 minutes
Submitted by
Satwinder Singh
if any query email your concern
Log in or register to post comments
(c) backuphowto.info, Jan Polzer, 2007 - 2013
http://www.backuphowto.info/rss.xmlhttp://www.backuphowto.info/http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formmailto:[email protected]://www.backuphowto.info/comment/878#comment-878http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/869#comment-869http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/787#comment-787http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/comment/775#comment-775http://www.backuphowto.info/user/register?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/user/login?destination=comment/reply/154%23comment-formhttp://www.backuphowto.info/epoxy%20flooring%20delhihttp://www.backuphowto.info/users/ersatvinderhttp://www.backuphowto.info/comment/878#comment-878http://www.backuphowto.info/users/tygrushttp://www.backuphowto.info/comment/869#comment-869http://www.backuphowto.info/comment/787#comment-787http://www.backuphowto.info/comment/775#comment-775http://www.toplist.cz/zahranicni