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Question
what is the difference between ONLINE UPS and OFFLINE UPS?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
online ups is the one which in on position (both cases:
powersupply on&off).but in case of offline ups is on at the
time power failure.
 
Is This Answer Correct ?    335 Yes 78 No
Divyaprabha
 
Answer
# 2
On line UPS means Supply will come from batteries on line
and charging also on line.
In OFF line UPS supply will come from batteries when main
line supply fails.Batteries will charge on line.
 
Is This Answer Correct ?    284 Yes 53 No
Ravi K Lavu
 
 
 
Answer
# 3
In ONLINE UPS, the load is always connected to
inverter output only in both the cases, whether normal
power supply is available or not.

In OFFLINE UPS, Inverter output is connected to load only
when normal AC power supply fails, means when AC power is
available it is directly goes to output.
 
Is This Answer Correct ?    188 Yes 20 No
Ghanshyam Pandey
 
Answer
# 4
Online UPS is the one which gives output all the time from
battery whether there is power failure or power on. You
get backing from battery all the time.

Offline UPS supplies Mains to the output when power supply
is regular and charges batteries as well at the same time.
When power fails it switches those batteries to produce
output for power backup.
 
Is This Answer Correct ?    128 Yes 21 No
Martin
 
Answer
# 5
Online UPS is the one which gives output all the time from
battery whether there is power failure or power on. You
get backing from battery all the time.

Offline UPS supplies Mains to the output when power supply
is regular and charges batteries as well at the same time.
When power fails it switches those batteries to produce
output for power backup.
 
Is This Answer Correct ?    88 Yes 11 No
Muteka
 
Answer
# 6
A standby UPS or "offline UPS" draws current from the AC
outlet and switches to battery within a few milliseconds
after detecting a power failure.

The line interactive UPS "interacts" with the AC power line
to smooth out the waveforms and correct the rise and fall of
the voltage.


The "Online UPS" is the most advanced and most costly UPS.
The inverter is continuously providing clean power from the
battery, and the computer equipment is never receiving power
directly from the AC outlet. However, online units contain
cooling fans, which do make noise and may require some
location planning for the home user or small office.
 
Is This Answer Correct ?    81 Yes 12 No
Ganesh.raj
 
Answer
# 7
on line ups having dual conversion
off line ups having one conversion
 
Is This Answer Correct ?    71 Yes 17 No
Gobhi
 
Answer
# 8
Online UPS, it is getting power AC is converting to DC, then
the DC source stored to Battery at power supply on mode when
power fail, the DC sorce is changed to AC by inverter so
output power is having without noise.

OFFline UPS is having automatic voltage regulator, it
getting power from supply, it is regulated by AVR, then
power stored to battery so the change over time approx 2ms
to 5ms so change over noise comes.
 
Is This Answer Correct ?    66 Yes 37 No
John
 
Answer
# 9
Online UPS is unterrupted power suppy to the load,
Offline UPS can't ensure uninterrupted power supply, it
depends on the tolerance of the load. For any sophisticated
equipment (medical equipment), Online UPS is recommended.
 
Is This Answer Correct ?    47 Yes 20 No
Hasan
 
Answer
# 10
online ups is a double conversion(dual) ups which firstly
converts AC power to D.c ,then D.c to A.C .the stored D.c
form of electricity remains within the batteries. in online
ups systems load is always connected to inverter. in online
ups system the power supply goes to the end user through
the battery,if there is A.c power cut ,then no harm or
interruptibility occurs .

APPLICABLE IN CRITICAL INSTRUMENTS LIKE C.T SCAN,X-
RAYS,ULTRA SOUND,OPERATION
EQUIPMENTS,SPECTROSCOPES,COMPUTERS ETC......

by SAMEER HUSSAIN
(M.E)
SNA POWER ENG. PVT LTD LUDHIANA

while in case of offline ups sytems the raw A.c supply is
connected by a realy type of mechanism,then the battery and
inverter is bound tothe msin supply. so when there is A.c
Power cut ,the really needs a time gap of 3-5 ms to shift
it to battery mode.
 
Is This Answer Correct ?    21 Yes 2 No
Sameer Hussain
 

 
 
 
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how to estimate the breaker capacity of breaker,please give the one example( 6.6 kv breaker,800a)????? Divis-Laboratories 2
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
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