A UPS (uninterruptible power supply) keeps your computer and network running through short outages and gives you time to save work and shut down safely. It also smooths out brownouts and voltage spikes that can damage electronics.
VA and watts
Every UPS lists two ratings, such as 1500VA/900W. The watt figure is what matters: add up the power draw of everything you plan to plug in and choose a model with at least 20–30% headroom.
AVR and pure sine wave
- AVR (automatic voltage regulation) corrects small voltage dips without draining the battery.
- Pure sine wave output is the safest choice for modern PCs with active PFC power supplies, audio gear and sensitive electronics.
Runtime
Most home UPS units provide a few minutes at full load and longer at light load. Plug only the essentials into the battery outlets — computer, monitor, modem and router — and use the surge-only outlets for printers and accessories.
Form factor
Mini-tower units sit under a desk; rackmount models fit network cabinets in small offices.
Browse UPS systems, power banks and power stations in Power & Batteries.
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