According to, UPS systems or “an uninterruptible power supply, also uninterruptible power source, or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide near-instantaneous protection from input power interruptions, by supplying energy stored in batteries, supercapacitors, or flywheels. The on-battery runtime of most uninterruptible power sources is relatively short (only a few minutes) but sufficient to start a standby power source or properly shut down the protected equipment.”

Two Types of UPS Systems

  1. Standby UPS systems (SPSs). A standby UPS runs the computer off of the normal utility power until it detects a problem. At that point, it very quickly (in five milliseconds or less) turns on a power inverter and runs the computer off of the UPS’s battery (see How Batteries Work for more information). A power inverter simply turns the DC power delivered by the battery into 120-volt, 60-Hertz AC power. (
  2. On-line or Continuous UPS systems. An on-line UPS avoids these momentary power lapses by constantly providing power from its own inverter, even when the power line is functioning properly. In general, on-line UPSs are much more expensive than SPSs. (

How To Choose Uninterrupted Power Supply

Installing UPS systems at  home or in the office is not an easy thing to do. Call for a Denver Electrician when you are thinking of having either a standby ups system or an on-line ups system installed in order to get the job done right.

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