How to know the back up time for a 5KVA UPS which is
connected to 15 nos. of computers? Is there any formula for
this? pls. tell me.

Answer Posted / k.prakashchandra

Back up time is dependent on storage capacity of
battery.vxAH=stored energy in watt hours. Divide this by
load in watts to get back up time in hours.If the batteries
are in parallel add up AH.If in series, AH of one battery is
to be considered adding voltages. Use identical batteries.

Is This Answer Correct ?    4 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

Actuality I have at home electrical panel with 220v 50hz, and I want to converter from there to 110v 60hz, to wiring on the half of my house. Also I like to keep another half of my house with the original 220v 50hz. What is the best and safety way to do?

1353


# 4 hi friends i m from electrical branch and seeking for tech. + apti. both papers of hpcl plz get it available as soon as possible my email id is sumit_lig189@yahoo.co.in

1564


what is a speed of rotor when we give supply to stator of 50hz and as well as rotor of 60hz of an induction motor?????

1223


If we impress a dc voltage of 230 V on an unloaded 230 V, 50 Hz transformer it wi A give high secondary voltage B burn out C give secondary voltage as per K D none of these

1574


circuit diagram of trip circuit supervision relay

1586






2. A current i=(10+10 sin t)amperes is passed through MI type ammeter. its reading will be.........

1902


tell me some type of questions throught which i can prepare for exam and do my best

1546


at work i have a genertor/alternater what is the easyest way to work out if it is dc or ac?

1374


Define non-touching loop.

799


what are the basic insulation levels & what its Unit

1487


A 7 storey building has a floor area of 35,000sq.ft on each storey. On the ground floor 11KV electrical sub-station is to be erected. A load of 3kw for every 400sq.ft (p.f is 0.8) is proposed for each floor. fire pump 7.5hp, water pump 5hp, lift 2 nos, each 10hp and 20shop load of each shop is 5kw. calculate a. load each floor b. total load of building c. L.T feeders for aech floor and from transformer to main. d. distribution diagram e. capacity of sub-station/capacitor bank f. line diagram

2368


HOW TO WRITE A QUENTION ANSWER? I MEAN SHORT OR LENGHTHY ? OR FROM THE BOOK AS BOOK..... SOME TIME WE GIVE A ANS FROM THE BOOK AS LIKE BOOK ND WE GET MINIMUM 60% MARKS OR MORE THEN....... THEN HOW TO FILL THE Q-PAPER?

1516


Convert a star connected network into a delta connected network.

647


why to use freewheeling diode ( diode in revers bias mode) across dc coil

3774


how to get electrical supervisour certificate in gujarat

1521