

Automatic voltage regulation (AVR): We required our upgrade-pick contenders to have AVR, and we strongly preferred it in all other models.Measured surge protection: 402.8 let-through volts.

Measured run time with a 300 W (modem, router, PC, and hard drive) load: 6 minutes.Measured run time with a 20 W (modem and router) load: 1.5 hours.Plus, Amazon offers only a one-year warranty on its UPS models, in contrast to the three-year warranties that brand-name companies provide. That should be fine in most cases, but it’s harder on the battery, and you shouldn’t use it for sensitive AV gear or medical equipment. Unlike our other picks, this less expensive model uses standby power management instead of automatic voltage regulation (AVR). Its maximum output is on the lower side (we measured up to 470 W in our testing), but that should be plenty of power for the six battery-backed outlets to support basics such as home Wi-Fi gear. If you’re on a tight budget, the Amazon Basics Standby UPS 800VA is an affordable UPS with the battery and run time of a more expensive model: It can keep a typical router and modem running for up to one and a half hours.

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Roughly the size and shape of a small PC tower, it has 10 outlets in total, six of which it backs up with the battery, and it adds two USB ports (one USB-A and one USB-C) for charging small devices without the need for an extra power adapter. Like our top pick, it can keep the average modem and router running for up to four hours, giving you more than enough time to save your work and wait for the blackout to end.

If you need to provide power to more (or larger) devices at your computer workstation during an outage, it can deliver up to 847 W-we had trouble finding home-office gear powerful enough to overload it in our testing. The APC BR1500MS2 is the most expensive UPS we recommend for most homes or small offices, but it offers a lot of value in the extra features it includes.
