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In a UPS, the equipment is always running off the inverter and battery. A UPS contains a charging/monitoring circuit that charges the battery constantly. It also monitors the AC line voltage. When a power failure occurs, the charger just stops charging the battery. The equipment never senses any change in power. The monitoring part of the circuit senses the change and emits a beep to tell the user the power has failed.

Level of Protection


A UPS provides a significant amount of protection against many types of power problems because the computer is always running off the battery and inverter. Problems with the input line voltage don’t really affect the output voltage. They only affect the efficiency of the charging circuit. A UPS is the most popular form of power protection because it provides significant protection at a fairly low cost.

Common Components/Features


When buying a UPS, you must look for the features that will solve your particular power problems or that meet your needs in general. Some of the features of a UPS include:


Multiple Outlets Each UPS will have at least one outlet for connecting computers or network devices to the UPS. Most have multiple outlets. The number of outlets depends on the capacity of the battery, inverter, and switching circuit in the UPS.


Line Voltage Indicator This light or indicator, when illuminated, indicates that the UPS is receiving sufficient AC line voltage to power the charging circuit of the UPS.


Battery Power Indicator This light or indicator, when illuminated, indicates that the equipment plugged into the UPS is running off the battery and inverter in the UPS and that the charging circuit is not active. When this indicator is initially illuminated, a beep will sound, warning that power to the UPS has failed.

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