The 10 Best Uninterrupted Power Supplies

Updated May 05, 2018 by Christopher Thomas

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We spent 47 hours on research, videography, and editing, to review the top options for this wiki. We often fail to realize how dependent we are on electricity until the lights go out, and when they do, mains-operated computers and networks run the risk of losing valuable data. One of these uninterrupted power supplies will provide the battery backup needed to keep your devices running long enough to shut them down safely, or until power is restored. When users buy our independently chosen editorial picks, we may earn commissions to support our work. Skip to the best uninterrupted power supply on Amazon.

10. Cyberpower CP825AVRLCD

During an outage, it's helpful to have the display screen on the Cyberpower CP825AVRLCD to keep an eye on how much energy is left. During normal usage, the unit corrects brownouts and voltage spikes to ensure your devices run smoothly.
  • simulated sine wave output
  • 3-year warranty included
  • powerbank cannot be replaced
Brand CyberPower
Model CP825AVRLCD
Weight 31.3 pounds
Rating 3.9 / 5.0

9. APC BE550G

The APC BE550G is one of the most popular solutions for home and small business use. Four of the outlets draw from its 330-watt supply, giving you enough time to save your spreadsheets and turn off the PC after everything else has gone dark.
  • all ports are safe from surges
  • lacks active voltage regulation
  • subpar energy storage capacity
Brand APC
Model BE550G
Weight 13.5 pounds
Rating 3.6 / 5.0

8. Tripp Lite 1500LCDT

There's so much juice inside the Tripp Lite 1500LCDT that you might finish an entire movie before you notice that the grid is down. The powerful battery is replaceable, too, so this one can remain in service for many years.
  • multifunctional lcd screen
  • mitigates voltage fluctuations
  • can produce an unpleasant odor
Brand Tripp Lite
Model SMART1500LCDT
Weight 28.5 pounds
Rating 4.3 / 5.0

7. APC BE850M2

A larger version of a best-selling home unit, the APC BE850M2 has enough juice for close to 6 hours of network operation, so you'll be able to surf the web all night. There are even 2 USB charging ports to keep your phone alive in case someone calls.
  • 6 powered and 3 pass-through outlets
  • low-voltage mode for longer events
  • lacks automatic current protection
Brand APC
Model BE850M2
Weight 4.8 pounds
Rating 4.5 / 5.0

6. APC BG500

Thanks to its lithium-ion technology, the APC BG500 is so much lighter than its lead-battery powered counterparts that you can mount it conveniently on the wall. It comes with a comprehensive, web-based interface that lets you monitor usage closely.
  • four continuously powered plugs
  • relatively small footprint
  • advanced capabilities at a high cost
Brand APC
Model BG500
Weight 7.3 pounds
Rating 4.0 / 5.0

5. Tripp Lite 1000RM1U

The Tripp Lite 1000RM1U's rack mount design makes it perfect for supporting the high-end A/V equipment lining your studio. Otherwise, its slim profile allows you to configure it in spots where most models simply wouldn't fit.
  • pure sine-wave output
  • max capacity of 800 watts
  • good for 14 minutes at one-half load
Brand Tripp Lite
Model SMART1000RM1U
Weight 35.5 pounds
Rating 4.7 / 5.0

4. CyberPower PR1500LCD

The CyberPower PR1500LCD is designed to support all types of electronics. It allows for up to 41 different usage and management settings, and the sine wave signal it delivers is critical to running valuable server equipment.
  • regulates frequency effectively
  • lcd remote control with a 4-ft cable
  • hefty connected equipment guarantee
Brand CyberPower
Model PR1500LCD
Weight 60.2 pounds
Rating 4.9 / 5.0

3. Cyberpower CP1500PFCLCD

The Cyberpower CP1500PFCLCD emits an audible alarm when it begins to draw on its auxiliary power, ensuring that you wake from your slumber to turn off your systems. It also defends against dangerous surges over phone and TV lines.
  • high-end versatility at a good price
  • reliable lead-acid battery
  • can be monitored from computer
Brand CyberPower
Model CP1500PFCLCD
Weight 28 pounds
Rating 4.6 / 5.0

2. CyberPower CP685AVR

The best option for most consumers, the CyberPower CP685AVR is one of the least expensive ones to use automatic voltage regulation to protect connected devices, keeping smaller networks consistent during brownouts and electrical storms.
  • perfect for the average home outage
  • mitigates data line spikes as well
  • low price is hard to pass up
Brand CyberPower
Model CP685AVRG
Weight 13.3 pounds
Rating 4.6 / 5.0

1. APC SMT1500C

The APC SMT1500C is a real powerhouse, as it provides energy and surge protection to all 8 of its outlets. To make life easier, it even predicts the month and year that the battery will need to be replaced, based on usage patterns so far.
  • powerful auto voltage regulation
  • high-efficiency green mode
  • available in capacities up to 3000va
Brand APC
Model SMT1500C
Weight 58 pounds
Rating 4.6 / 5.0

What Is An Uninterrupted Power Source

An uninterruptible power supply (UPS) provides backup power when there is a blackout or your main power source goes out for some reason. It differs from an emergency power system, which takes time to activate because it kicks in instantly during an outage. If you cannot afford to lose power during a project – like an all-day download – a UPS is your best option to protect against data loss and prevent system interruption. That’s why it’s called uninterruptible because it completely overrides an outage.

There are three main types of uninterrupted power supplies, namely the on-line, the line-interactive and the standby. An on-line UPS accepts an alternating current (AC) input, converts it into direct current (DC) to send it through the rechargeable battery, and then turns it back into an alternating current to power the protective equipment. A line-interactive UPS redirects the battery’s DC path from charging mode to supplying mode during an outage. It’s a very intuitive machine that can maintain power reserves during continuous undervoltage or overvoltage situations by selecting the perfect amount of backup power to supply. A standby system (also known as an off-line system) is directly powered by a standard AC wall outlet, and it only provides backup power if the main power source fails. Standby UPS systems are the simplest and most popular type for personal computers, offering basic features like surge protection and a backup battery.

For especially large power needs, a dynamic UPS is appropriate. Dynamic models use a synchronous alternator that is connected to the main equipment through a choke. The unit stores energy in a flywheel, and during an outage, an Eddy-current regulator holds onto the power. Recently, technicians developed a fuel cell UPS, which is more environmentally friendly and quiet. It uses hydrogen and a fuel cell as a power source and is ideal for small areas.

Common Causes Of Power Outages

There are several reasons the power goes out ranging from human error to natural disasters. In a strong storm, a tree can fall on a power line, breaking it and cutting off power to an entire neighborhood or town. If you live in an area with extreme weather, always let the city tree trimmers do their mandated work in your yard – they are doing it for your safety, and possibly removing shrubbery that’s too close to a power line. If a storm doesn’t cause a tree to fall, it could send a lightning bolt into a power line, or cause a flood that damages above or below-ground electrical equipment.

If you live in an area with a lot of wildlife activity, a UPS can be invaluable. An animal can crawl onto a transformer or fuse, causing the equipment to automatically shut down to protect the rest of the system, rendering you powerless. If you live in a remote area, you could be tens of miles away from a building with power, so you need to provide your own.

Construction work on your property or street can cause a power outage. Workers can accidentally drill into a power line, or back a tractor over one. A car crashing into a pole could cause an outage, too. Familiarize yourself with important safety precautions, in case there is ever a loose power line on your street. In addition to having a UPS ready, you should know what to do if you can't regain power for several hours.

The Largest UPS In The World

In Fairbanks, Alaska, where temperatures can drop as low as negative 50 degrees celsius, power outages used to be a common problem. The remote nature of the state means an outage could be very dangerous since the only way for residents to travel to another state is by boat or plane. If communication towers are down, navigating either of these vessels is dangerous. Within Alaska, there are also people living in almost total isolation, so they’re nearly helpless if their power fails. People simply cannot survive if their heater breaks in negative 50-degree weather.

In August 2010, technology group ASEA Brown Boverithe (ABB) installed the world’s largest UPS in Fairbanks. The system is made up of a converter designed by ABB, and nickel cadmium batteries created by battery manufacturer Saft. The converter turns the batteries’ DC power into AC power, and can produce up to 27 megawatts of power for 15 continuous minutes. That quarter of an hour gives the system time to retrieve backup generation. The system can deliver 46 megawatts of power for an even shorter time frame, but Fairbanks primarily needs it to deliver power just long enough for backup generation to start up.

The UPS can operate in seven different modes, one of which is automatic scheduling, which offers immediate system support if a breaker trips on a transmission line or local generator. It also has a power system stabilizer mode, which works to dampen power system oscillations. In charging mode, a dispatcher controls at what rate megawatts charge the UPS, and when the system can begin charging again after an emergency discharge.


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Last updated on May 05, 2018 by Christopher Thomas

A traveling chef, musician, and student of the English language, Chris can be found promoting facts and perfect copy around the globe, from dense urban centers to remote mountaintops. In his free time he revels in dispelling pseudoscience, while at night he dreams of modern technology, world peace, and the Oxford comma.


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