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How long can equipment on a UPS keep running after the power goes off?
It depends on how big a UPS do you have and what kind of equipment it protects? For most typical computer workstations, one might have a UPS that was rated to keep the machine alive through a 15 minute power loss. If you need a machine to s..

 
What are the problems usually happen to the power supply ?
Blackout, power slump, power surge, continuous under voltage, continuous over voltage, frequency fluctuation, interference of computers, switching transient, harmonic distortion, etc.

 
How are the "sizes" of UPS's determined ?
Typically, a UPS has a VA rating. The VA rating is the maximum number of Volts * Amps it can deliver. The VA rating is not the same as the power drain (in Watts) of the equipment. Computers are notoriously non-resistive. A typical PF (power..

 
What are the main categories of UPS?
There are basically three different types of devices by topology, which are offline, line interactive and on line ones.
For offline UPS, power is usually derived directly from the power line, until power fails. After power failure, a bat..
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