State any three points of difference between online UPS and off-line UPS.

State any three points of difference between online UPS and off-line UPS. 
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1 Answer

Answer :

On-line UPS 
Off-line UPS
An on-line UPS continuously powers the protected load from its reserves (usually lead-acid batteries or stored kinetic energy), while simultaneously replenishing the reserves from the AC power. 
An off-line UPS remains idle until a power failure occurs, and then switches from utility power to its own power source, almost instantaneously. 
The on-line type of UPS, in addition to providing protection against complete failure of the utility supply, provides protection against all common power problems, and for this reason it is also known as a power conditioner and a line conditioner. 
The Off-line type of UPS provides no protection against common power problems 
The online UPS runs all the time. The charger now runs the inverter, as well as maintaining charge on the battery. The inverter supplies the load. Power goes from input to charger to inverter to output. 
The offline UPS is in standby mode. The charger is maintaining the battery, but the inverter stage is not running. Power goes from input to output, bypassing the inverter. 
In this type of UPS isolation from mains is available. 
In this type UPS isolation from mains is not available. 
In this type of UPS frequency stability is not available on the mains power. 
In this type of UPS frequency stability is always available. 
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