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UPS topology

Line-interactive UPS

These UPS units list a line-interactive topology. That is a topology class, not a runtime figure, and it is not the same as online double-conversion. Line-interactive units typically regulate voltage without switching to battery as often as standby models. Check listed VA, watts, and waveform. This page does not size runtime.

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UPS Size Calculator

Size UPS output watts and an estimated VA class from your equipment load.

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Related guides

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.

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Related 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.

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watts

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.

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pure 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.

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UPS capacity

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.

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UPS topology

Online / double-conversion UPS

Browse UPS units listed as online / double-conversion. Topology is not a runtime or installation result.

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