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Tuesday, July 16, 2013

Difference Between Online and Offline UPS


Characteristics
Online UPS
Offline UPS
Inverter
Inverter always remains ON all the time and provides output Power.
Inverter is switched on only is main supply is off.
Switching Time
Online UPS has switching time between 0-1 ms
Switching Time is generally <5 ms.
Area of Use
Generally used in large organizations and the areas where perfect UPS supply is needed.
Generally used for personal use at homes or small offices.

Inverter Design
Sine wave PWM Inverter is used.
Quasi Sine wave inverter is used.
Batteries  Location
External batteries are used with high capacity models.
Generally uses internal batteries.
Batteries Type
Tubular Lead acid batteries are used.
SMF (Sealed Maintenance Free) Batteries are used.
Backup Duration
Few Minutes to few Hours. E.g. 30 Minutes to 10 Hours.
10 to 20 Minutes Only.
MOSFET/IGBT Use
Uses MOSFET and IGBT
Only uses MOSFET
Price Range
Very High
Low
Size
Large and bulky
Small and portable
Input Supply Type
Three Phase
Single Phase

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