Tripp Lite AVR900U UPS: This uninterruptible power supply has the wrong set of features
Macworld|September 2021
It’s a quality product, but not the right choice for computers or home network gear.
GLENN FLEISHMAN
Tripp Lite AVR900U UPS: This uninterruptible power supply has the wrong set of features

The 12-outlet Tripp Lite AVR900U is the wrong intersection of perfectly fine separate features in an otherwise well-made model. Its reasonable battery size could support a tricked-out computer system with multiple displays and peripherals for a few to several minutes during a power outage. The line-interactive approach incorporated in its design provides fast power switchover (as quick as a few milliseconds), along with constant power conditioning to correct for minor fluctuations without wearing out the internal battery.

On the other hand, the AVR900U relies on simulated power switching instead of a “pure” sine wave. That means it’s not the right choice for computers with active power factor correction (PFC). A simulated, or stepped, sine wave fed into an active PFC power supply can cause a high-pitched whine and prematurely wear its components or even cause it to fail.

Active PFC power supplies are more efficient than previous designs, and also allow voltage adaptive for worldwide sales. But they’re finicky about the smoothness of the alternating current fed into them, and it’s not worth the price of repairing your computer rather than buying a better-suited UPS with a pure sine-wave output that’s as smooth as utility power.

For about $40 more, you can instead purchase the CyberPower CP850PFCLCD (fave.co/3ClGhCq), a line-interactive UPS that also has a pure sine-wave output and similar power capacity. (We reviewed the slightly higher-capacity CyberPower CP1000PFCLCD [fave.co/2WEYXfR], which is in same series of UPS models.)

Esta historia es de la edición September 2021 de Macworld.

Comience su prueba gratuita de Magzter GOLD de 7 días para acceder a miles de historias premium seleccionadas y a más de 9,000 revistas y periódicos.

Esta historia es de la edición September 2021 de Macworld.

Comience su prueba gratuita de Magzter GOLD de 7 días para acceder a miles de historias premium seleccionadas y a más de 9,000 revistas y periódicos.

MÁS HISTORIAS DE MACWORLDVer todo
Mac 911
Macworld

Mac 911

Solutions to your most vexing Mac problems.

time-read
7 minutos  |
December 2024
Bowers & Wilkins Pi8: Great-sounding headphones that support aptX
Macworld

Bowers & Wilkins Pi8: Great-sounding headphones that support aptX

B&W's new top-of-the-range Bluetooth earbuds sound great and include an innovative smart case that supports aptX technology for high-quality audio-even on Apple devices.

time-read
3 minutos  |
December 2024
AirPods versus AirPods Pro: How they compare
Macworld

AirPods versus AirPods Pro: How they compare

Don't know whether to buy the AirPods 4, AirPods 4 with ANC, or AirPods Pro 2? Here's how they stack up.

time-read
5 minutos  |
December 2024
Apple's true hit of 2024 isn't the iPhone 16
Macworld

Apple's true hit of 2024 isn't the iPhone 16

Apple's unsung hero of the fall is the AirPods 4.

time-read
3 minutos  |
December 2024
Ugreen Revodok Pro 210: Decent speeds at a nice price
Macworld

Ugreen Revodok Pro 210: Decent speeds at a nice price

A hub for users who don't need top performance from their connections.

time-read
2 minutos  |
December 2024
Anker Prime 100W GaN Wall Charger: Clever and compact
Macworld

Anker Prime 100W GaN Wall Charger: Clever and compact

Anker proves that with a clever design, you can also achieve compact dimensions suitable for traveling.

time-read
2 minutos  |
December 2024
Wombat Willow: A solid typing tool with some quirks
Macworld

Wombat Willow: A solid typing tool with some quirks

This isn't a keyboard that lets you simply plug in and go-you need to read the manual.

time-read
4 minutos  |
December 2024
pdfFiller: An overpriced, half-baked PDF editor for macOS
Macworld

pdfFiller: An overpriced, half-baked PDF editor for macOS

A basic PDF editor that doesn't fulfill its promises and costs too much.

time-read
3 minutos  |
December 2024
iPHONE 16 & 16 PLUS REVIEW: THE PHONE FOR EVERYONE CREEPS INTO PRO TERRITORY
Macworld

iPHONE 16 & 16 PLUS REVIEW: THE PHONE FOR EVERYONE CREEPS INTO PRO TERRITORY

APPLE'S BEST ALL-AROUND PHONE IS BETTER AND ALL-AROUNDER.

time-read
8 minutos  |
December 2024
APPLE WATCH SERIES 10 REVIEW: MODEST IMPROVEMENTS TO A PROVEN FORMULA
Macworld

APPLE WATCH SERIES 10 REVIEW: MODEST IMPROVEMENTS TO A PROVEN FORMULA

IF YOU'VE BEEN WAITING FOR A BIG APPLE WATCH REVAMP, THIS ISN'T IT, BUT IT'S STILL THE BEST SMARTWATCH AROUND.

time-read
4 minutos  |
December 2024