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Online / double-conversion UPS
These UPS units list an online / double-conversion topology. That class continuously converts power rather than switching only on a drop, and it is not the same as line-interactive. Topology does not tell you runtime, outlet type, or whether the unit is rack or tower. Check listed VA and watts against your load. Runtime is not calculated here.
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How Many VA Do I Need in a UPS?
Calculate the UPS capacity you need by totaling your equipment’s watts, converting watts to VA using power factor, and adding practical headroom. A UPS must meet both its VA and watt limits, while runtime requires a separate battery check.
Read guideUPS Sizing Calculator: Watts, VA and Runtime
Size a UPS systematically by adding the protected load, converting between watts and VA, allowing headroom, and checking runtime separately. This guide includes a worked example and a practical UPS sizing checklist.
Read guideRelated glossary
VA
VA means volt-amperes, a measure of apparent power. It describes the electrical capacity a product can handle, but it is not the same as watts, which measure real power.
Open termwatts
Watts are a unit of electrical power. On a UPS product page, a watt rating usually indicates how much connected equipment the unit can support or how much power a device uses, depending on the label.
Open termpure sine wave
Pure sine wave is an AC output waveform that closely follows utility power. It can be important for equipment that requires, or works better with, a smooth and consistent waveform.
Open termMore in this catalog
UPS units listed at 1500 VA or higher
Browse UPS units whose listed VA is 1500 or higher. VA is not watts, and this is not a runtime estimate.
BrowseLine-interactive UPS
Browse UPS units listed as line-interactive. Topology is not runtime, and it is not the same as online double-conversion.
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