Best Uninterruptible Power Supply (UPS) of 2021

The best UPS (uninterruptible power supply) devices on this page are important purchases for any business - or home user - who needs electr...

The best UPS (uninterruptible power supply) devices on this page are important purchases for any business - or home user - who needs electronic devices such as PCs and servers that have constant power connections 24 hours a day, seven days a week.

If there's a power cut, even a very brief one, then the results can be catastrophic, as servers could become unreachable, and data could even be corrupted if a computer shuts down suddenly.

That's where the best UPS come in, as if there's a power cut, they will seamlessly switch to battery power, and your devices will remain on and running until the main power is restored, or you can safely shut down the device.

These days many of us are working from home, so buying the best UPS your budget can stretch to is even more important. You may find that you're plugging in a lot more power-hungry devices into your home power supply, and this could lead to power cuts or power surges. Your home likely won't have the power backup solutions that your office does, so buying a UPS for your home could be a very wise investment.

The UPS devices we include in this guide cover a wide range of use cases, from small UPS devices for homes that can keep a router and PC running, to large and powerful UPS devices for enterprise uses. Because of this, we have listed these best UPS devices in no particular order.

Best UPS (Uninterruptible Power Supply) at a glance:

1. APC Back-UPS ES-BE700G
2. CyberPower CP1500EPFCLCD
3. Eaton 9SX 5000i RT3U
4. Vertiv Liebert PSI 1500VA
5. APC BE600M1 Back-UPS 600VA

1. APC Back-UPS ES-BE700G

A simple UPS for voltage fluctuations

Input voltage: 230V | Output capacity: 405 (watts) | Outlets: 8 | Battery runtime: 13 mins (half load), 4 mins (full load) | Recharge time: 16 hours

Easy to use

LED status

Lacks features

Long charge time

If you're after a cheaper, and more simple, UPS device, then the APC Back-UPS ES - BE700G is a great choice. We wouldn't recommend it for large businesses with lots of mission-critical computers and servers, but it offers plenty of power for homes and small businesses to keep their devices going when the power fails. If you're looking for something more feature-rich, however, you may want to consider a different UPS.

2. CyberPower CP1500EPFCLCD

The best UPS for small and medium sized businesses

Input voltage: 230 Vac | Output capacity: 900 (watts) | Outlets: 6 | Battery runtime: 10 mins (half load), 3 mins (full load) | Recharge time: 8 hours

LCD panel

USB ports included

Bulky

Expensive

The CyberPower CP1500EPFCLCD is an excellent UPS for home and small business use. It comes with a decent amount of ports, as well as USB, for plugging in your devices. RJ11/RJ45 ports keep your phone, fax and modem lines protected from power surges, and it comes with a number of energy-saving features to prevent it from wasting energy when in use. It also comes with a clear LCD display that gives you information about the UPS.

3. Eaton 9SX 5000i RT3U

A flexible UPS for businesses

Input voltage: 21A | Output capacity: 230Vac | Battery runtime: 3.5 mins (full load) | Recharge time: 1.5 hours

Power efficiency features

Provides lots of power for numerous devices

Very expensive

Not suitable for home use

If you have a large office with several devices, then the Eaton Eaton 9SX 5000i RT3U is an excellent device. Not only does this rack-mounted UPS keep your important devices running when there's an issue with your power, but it also provides some excellent power efficiency features that can cut energy usage (and associated bills) with up to 95% efficiency in online double conversion mode and 98% in high-efficiency mode. You can buy optional extended battery modules for increased run time, and the LCD user interface makes it easy to manage. Definitely a UPS to consider if you have the budget.

4. Vertiv Liebert PSI 1500VA

A powerful UPS for business use

Input voltage: 300V | Output capacity: 1350 (watts) | Outlets: 8 | Battery runtime: 9 mins (half load), 3 mins (full load) | Recharge time: 5 hours

Plenty of power of office use

Decent recharge time

Overkill for home use

If you have a busy office with a number of essential devices that will need an uninterrupted power supply, then the Vertiv Liebert PSI 1500VA is definitely worth considering. Its three batteries will keep power-hungry devices running when the power goes down, and it can be installed into a server rack, making it convenient as well. It comes in a number of configurations, so you can choose the one that best suits your needs, but if you're looking for a UPS for home use, then the APC BE600M1 Back-UPS 600VA above is a better choice.

5. APC BE600M1 Back-UPS 600VA

A great UPS for home use

Input voltage: 120V | Output capacity: 330 (watts) | Outlets: 7 (plus one USB port) | Battery runtime: 10 mins (half load), 3.2 mins (full load) | Recharge time: 10 hours

Plenty of power for home devices

Small form factor

Not a huge amount of ports

Not powerful enough for big businesses

This is another great UPS from APC, and with the BE600M1, the company has created a UPS device that is ideal for home use. That's thanks to its small and unobtrusive design, and if offers enough power for smaller devices, such as home NAS drives, routers and games consoles. With careful management, you can keep the power flowing to a router or monitor for enough time to overcome most power cuts. For office use, with lots of power-sapping devices that need to be powered at once, then you'll want to look elsewhere on this best UPS list, but for home users on a budget, this is a great choice.

• Check out our list of the best workstations to plug into a UPS

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