The power consumption of the equipment will typically be listed in either Watts (W) or Volt-Amperes (VA). Since most UPS systems are rated in Kilovolt-Amperes, you may need to convert the Watts to VA by dividing the Watts by the power factor of the equipment. . An uninterruptible power supply (UPS) or uninterruptible power source is an electrical apparatus that provides emergency power to a load when the input power source or mains power fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide. . Need to learn more before making a decision? How Much Power Will Your UPS Use? Choose the right UPS, uninterruptible power supply, based on your total power consumption, Eaton UPS Selector . Enter the battery backup, or “uninterruptible power supply” (UPS). These small, affordable power units act as a power source for your sensitive electronics in case of a power outage. But will they keep your WiFi running long enough, and if so, do they all perform the same? To answer that question. . A UPS is a device that provides electrical energy to loads in the event of loss of the normal utility electrical power. The UPS powers the loads for a limited amount of time using stored energy from batteries. What is a Momentary interruption? A momentary interruption is the loss of electrical. . Calculate the appropriate uninterruptible power supply (UPS) size by entering your equipment power requirements and backup needs below. This calculator helps determine the correct UPS capacity in VA (Volt-Amps) and required battery runtime based on your connected load and desired backup duration. It offers immediate protection from power interruptions by supplying power from a separate source, typically batteries. Standby UPS 2. Line-Interactive UPS 3.