How to choose an uninterruptible source power supply

Uninterruptible power supplies (UPS or UPS) not only help protect important documents from a sudden shutdown electricity, but also indirectly perform the function of a stabilizer.


  1. How to choose an uninterruptible power supply for computer
  2. UPS Type
  3. UPS power
  4. Battery life
  5. Availability of control software
  6. The presence of additional outlets
  7. Availability of indicators
  8. Battery Replaceable
  9. Summary

How to choose an uninterruptible power supply for your computer: characteristics to consider

Uninterruptible power supply for the computer

When choosing an uninterruptible power supply, you must pay attention to the following characteristics:

  1. Type of UPS (backup, line-interactive, online);

  2. Power;

  3. Battery life;

  4. Availability of management software;

  5. The presence of additional outlets, including a telephone line and local area network;

  6. Availability of indicators;

  7. Ability to replace batteries.

UPS Type

The type of UPS determines how it will respond to a drop. voltage in the network – and how often you will have to change the battery of the device. Uninterruptible power supplies are divided into:

  1. Reserve;

  2. Line Interactive;

  3. Online

Redundant UPSs, also called offline, are the simplest and most cheap. They work according to the following principle – if within 10 ms there is no voltage in the external network or its value is too low, the battery comes into play. However, it is absent stabilizer. And so the low price turns into problems, which occur if fluctuations are often observed at home or in the office voltage – the battery wears out and has to be replaced.

Line-interactive UPSs are equipped with a built-in stabilizer, which equalizes the voltage in the network, raising or lowering it at necessary. And if it falls too much – then switch battery powered. Therefore, they are great for protection or office equipment.

Online UPS is the most expensive. However, due to the fact that they Constantly generate direct current and feed them connected computer, they provide the most rigid fixation of voltage (in within plus or minus 1%) and zero response time. Nevertheless, use such expensive equipment to protect your home or office impractical.

Choose a UPS by capacity

UPS Power

Power means how many devices can power a UPS without voltage drops. The higher it is, the more computers monitors and printers can be connected to it. However, ups really high power are very expensive.

Power should be calculated as follows – summarize the power of the devices that you plan to connect to the UPS, and add to this 20-30% “in reserve”. So, in the end, for ordinary 350-500 watts is enough for a home or office PC with an LCD monitor. Game a computer with a monitor will require 500-1500 watts. And here is the laser even 1500 W is not enough for the printer, but it’s worth determining whether to use it in conditions of blackout?

Battery life

Sorry, get specific capacity information. The batteries installed in the UPS are almost impossible. But you can calculate it indirectly. Average computer power up time 200 watts from the source is 5-7 minutes.

Accordingly, if the source power is 800 W, then such a computer will work on it for about 20 minutes. But it is very approximate calculation.

However, if at closing and maintaining all the important documents are enough for 5-7 minutes, then you can purchase a UPS with power, which is equal to or slightly greater than the power of the computer. If this time is not enough, then the power of the UPS should significantly exceed computer power.

Availability of control software

Many UPS models come bundled with special software. data protection. It not only allows you to analyze the condition source, but will also start automatically saving files to open applications if the electricity is disconnected for a long time. This will further protect information from loss.

Therefore, the availability of control software is an important advantage of the UPS over other models.

The presence of additional outlets

the presence of additional IHD sockets

The UPS can be used to power not only a computer, but also various peripheral devices – office equipment, multimedia, mobile electronics etc. But if we talk about the office, then it is desirable that it also provides a local area network with an electric current. And many UPS models are equipped with special sockets for telephone line and Ethernet cable.

Such sockets are used not only for power, but also for stabilization of current in the network, whose differences can be caused, for example, the formation of excess voltage in street wires during a thunderstorm.

Availability of indicators

If we are talking about a UPS with a built-in stabilizer, then it’s very it is important to receive real-time information about input and output voltage. In addition, indicators that show the remaining battery capacity when powered by it and the need to replace it.

Therefore, you should buy a UPS that is equipped with a good system. indicators. For example, an LCD, in real time displaying information about the parameters of the device.

Ability to replace the battery and connect additional battery

Replacing a battery is cheaper than buying a new UPS. Therefore, if you plan to use the device for a long time, it’s worth purchase a model that supports self-replacement batteries.

In addition, many UPS models support scaling. by connecting new batteries. Such devices Recommended for creating backup power in offices.


Choosing a UPS for your home or small office is worth be guided by the principle of “reasonable sufficiency”. Source must support the work of the required number of devices in over a period of time that is sufficient to preserve important documents.

The best solution is to purchase line-interactive or online UPS, since a stabilizer is already integrated in it, thanks what the device will be able to independently equalize the voltage in network.

If the voltage in the network is usually constant, and the shutdown extremely rare, backup will be enough (offline) UPS


In the following articles, our experts tell you how to choose router for home and office, and the secrets of choosing a reliable router.

Attention! This material is subjective opinion of the authors of the project and is not a buying guide.

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