Smart Home & Tech · Home office tech
How to choose a UPS for a home office
Add the watts of the devices you need during an outage, then pick a UPS whose watt rating exceeds that sum. Treat printed runtime as a lab condition, not your desk.
Watts first, runtime second
List the modem, router, and computer. Use nameplate watts or a meter. The UPS watt rating must be higher than the sum of what will be plugged into the battery outlets, not the surge-only outlets. A VA number is not the same as watts. Read both on the spec sheet.
Who this is for
A home office that only needs minutes to save work and keep a call from dying. It is not a whole-house generator plan.
Checklist
- Separate battery-backed outlets from surge-only outlets on the model you are reading.
- Estimate draw with the energy calculator if you want a sense of normal use, but size the UPS from the load it must carry at once.
- Replace the battery on the vendor’s schedule. A UPS with a dead battery is a power strip.
- Keep backups of the files themselves. Power protection is not a backup policy.
Limits
We did not discharge these units in a lab. Runtime drops as batteries age. Do not plug laser printers or heaters into a small UPS.
Questions readers ask
Will a UPS keep a space heater running?
No. Heaters draw far more than a small desktop UPS is built for. Put only the network and the computer you need to save work.
Sources and methodology
Claims that depend on an outside authority are tied to the references below. Product details change. Confirm the current specification sheet before you buy or install anything.
- Uninterruptible power supplies — ENERGY STAR (government program), accessed September 20, 2026. Used to point at published efficiency information for UPS products, not a specific model ranking.
Parent topic: Smart Home & Tech · Related tool: Appliance energy-use calculator