Instant continuity

UPS systems

A UPS protects electronics from outages and voltage events while providing time to keep working or shut down safely. Size by watts first, then VA and runtime.

See best picks Compare products Calculate runtime

Decision chart Selected UPS continuous output Do not load a UPS to its maximum. Leave headroom for startup demand, upgrades, and battery aging.

APC BE600M1 330W

APC BR1500MS2 900W

CyberPower CP1500PFCLCD 1,000W

Start here

Most useful guides

Best UPS for home officeOpen guide →Best UPS for Synology NASOpen guide →Best UPS for serversOpen guide →Best UPS for small businessOpen guide →How to size a UPSOpen guide →How to test a UPS batteryOpen guide →

Recommended starting points

Products that fit this category

Use the linked guide and calculator to confirm the fit before buying.

Best budget UPS

UPS · Best for Router, modem, and small electronics

APC BE600M1

600VA 330W output Sealed lead-acid

Check today’s Amazon price paid link Read the guide Official specifications ↗

Best premium home-office UPS

UPS · Best for NAS, network gear, and sensitive electronics

APC BR1500MS2

1,500VA 900W output Sealed lead-acid

Check today’s Amazon price paid link Read the guide Official specifications ↗

Best high-output desktop UPS

UPS · Best for Gaming PCs, workstations, and active-PFC systems

CyberPower CP1500PFCLCD

1,500VA 1,000W output Sealed lead-acid

Check today’s Amazon price paid link Read the guide Official specifications ↗

Two-minute sizing start

What are you trying to keep running?

Pick the load and target time. We will estimate the battery class, then send you to the right guide and full runtime calculator.