A computer UPS keeps your desktop running during power outages long enough to save open files and shut down properly. It also smooths out voltage fluctuations that can shorten hardware lifespan over time. These five picks cover home office desktops, gaming rigs, and workstations at practical price points with reliable battery performance.
| Product | Best For | Rating |
|---|---|---|
| APC Back-UPS Pro 1500VA | Home office and mid-range desktops | 4.7/5 |
| CyberPower CP1500PFCLCD | Pure sine wave on a budget | 4.6/5 |
| APC Smart-UPS 1500VA | Workstations and NAS drives | 4.8/5 |
| Eaton 5S 1500VA | Reliable midrange option | 4.5/5 |
| CyberPower CP685AVR | Basic desktop protection on a budget | 4.2/5 |
APC Back-UPS Pro 1500VA — Best Computer UPS Overall
The APC Back-UPS Pro 1500VA is a widely trusted choice for home offices and mid-range desktop setups. It provides 1500VA and 900W of power, enough for a standard desktop tower and two monitors with 10 to 20 minutes of runtime during an outage. The included PowerChute software connects via USB and automates graceful shutdown if you step away when power fails. It has 10 protected outlets split between battery-backed and surge-only circuits. The LCD display shows load percentage, battery charge, and estimated runtime at a glance.
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CyberPower CP1500PFCLCD — Best Pure Sine Wave UPS
The CyberPower CP1500PFCLCD delivers pure sine wave output, which matters for active PFC power supplies found in most modern desktops and gaming PCs. Simulated sine wave UPS units can cause instability or damage with active PFC PSUs, making pure sine wave the safer long-term choice. This unit outputs 1500VA and 900W with 12 outlets, USB and serial connectivity for shutdown software, and an LCD panel for status monitoring. It’s available at a lower price than APC’s equivalent, making it a strong value pick for anyone building or upgrading a desktop PC.
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APC Smart-UPS 1500VA — Best for Workstations and NAS
The APC Smart-UPS 1500VA is a step up in both price and capability, designed for workstations, small servers, and NAS enclosures that need clean and stable power. Pure sine wave output protects sensitive equipment, and the intelligent battery management extends battery service life. It supports extended battery modules for longer runtime and has a higher build quality than the consumer Back-UPS line. Network management cards can be added for remote monitoring. For creators or developers running continuous workloads, the investment in this unit pays off in fewer hardware headaches over time.
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Eaton 5S 1500VA — Best Midrange Reliable Option
The Eaton 5S 1500VA earns its place through consistent real-world reliability and straightforward operation. Eaton is a commercial UPS manufacturer that brings industrial-grade engineering to its consumer line. The 5S provides 1500VA and 900W with pure sine wave output, 8 battery-backed outlets, and LCD status display. The unit is quiet during operation and connects via USB for shutdown software integration. Battery replacement is tool-free and uses a standard battery available from multiple suppliers, which reduces long-term ownership costs. A solid choice for users who want proven commercial reliability without the Smart-UPS price.
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CyberPower CP685AVR — Best Budget UPS for Basic Desktops
The CyberPower CP685AVR is the right choice for a basic desktop or small home office setup where a full workstation-grade UPS is overkill. At 685VA and 390W, it covers a desktop PC with a single monitor for roughly 5 to 10 minutes of runtime. Automatic voltage regulation handles brownouts and over-voltage without switching to battery, which extends battery life. The price makes it easy to protect a secondary computer or a home networking setup. It lacks pure sine wave output, so pair it only with older PSUs or check your PSU spec before purchasing.
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How to Choose a Computer UPS
Calculate your load first. Add up the wattage of your PC PSU, monitor, and any peripherals that need backup power. Multiply that total by 1.6 to get your minimum VA rating. Prioritize pure sine wave output if your PC has a modern power supply with active PFC, which covers most builds from the last five years. Check the number of battery-backed outlets versus surge-only outlets. Verify USB connectivity and compatible shutdown software for your OS. Finally, research battery replacement cost and availability before buying, since replacement batteries can costcurrent pricing tocurrent pricing and are needed every 3 to 5 years.
For related reading, see best computer surge protectors and best power strips for home offices. Review our evaluation criteria at /methodology.
Frequently asked questions
What size UPS do I need for a desktop computer?+
For a typical desktop PC with a monitor, a 1000VA to 1500VA UPS provides 5 to 15 minutes of runtime during an outage, which is enough to save work and shut down safely. High-end gaming PCs or workstations with multiple monitors may need 1500VA to 2200VA. Check your PSU wattage and multiply by 1.6 to estimate the VA rating you need.
Does a UPS protect against power surges as well as outages?+
Yes. All UPS units include surge protection built in, which covers voltage spikes from lightning nearby or utility switching. The battery backup handles complete outages and brownouts. For areas with frequent electrical storms, look for a UPS with a joule rating above 1000 and replace the unit after a significant direct surge event as the protection components can degrade.