To ensure the safety of information and minimize the risk of breakdown of office equipment, it is necessary to use an uninterruptible power supply for a computer — the device is responsible for the continuity of the supply of electricity in a certain time interval.
The use of a UPS is especially important when there are frequent outages or problems with the quality of the supplied electricity. Uninterruptibles have differences in the power circuit, differ in power and other parameters, so you need to have a good understanding of the characteristics of those devices that are on sale.
To facilitate the selection task, we have prepared an overview of the best UPS offers, described the features of the operation of different types of household uninterruptible power supplies, and also outlined the main parameters that must be taken into account when buying such devices.
Why do you need a UPS for a computer
UPS stands for Uninterruptible Power Supply. So, an uninterruptible power supply for a computer ensures the functioning of the load during power surges. And in the event of a power outage, it ensures uninterrupted operation of all included equipment. There are budget options with traditional protection and a short duration of work, but this time is enough for the correct completion of the work.
Layout of an uninterruptible power supply in a server room
It is worth noting the advantages of a UPS for the home:
- Protect your computer from damage in case of unexpected disconnection from the network. In this case, you can safely close all open files and properly turn off the equipment.
- Protection against impulse voltage increase.
- With a battery, the equipment can work even when turned off.
- The required voltage level is provided even without additional devices.
- Protection against high or too low voltage.
- Ability to switch to backup power.
The scheme of operation of uninterruptible equipment is simple: in a normal situation, the load is powered from the network, and if the voltage disappears, it switches to battery mode.
Some models are equipped with a voltage stabilization function at the input and output. UPS models have a special input for printers.
Uninterrupted Battery System
3. Determine the suitable UPS model by power
It is necessary to compare the power characteristics of the «uninterruptible» devices offered by the manufacturer or supplier with the indicator obtained by adding a reserve of 30% to the maximum power consumption of the load (hereinafter referred to as the load indicator). The power value closest to this indicator (rounded up) will be the appropriate UPS rating.
Rounding the load indicator down is not recommended, as it leads at least to a decrease in the previously built-in power reserve, and at most to the purchase of an uninterruptible power supply with an insufficient rating.
Don’t forget the difference between the units of measurement and present the load rating in both watts and volt-amps. Make sure that the UPS rating exceeds it in both active and apparent power!
The main types of UPS for computers
There are certain types of uninterruptible power supplies for the home. According to the type of action, the equipment is divided into two types: off-line (offline) in-line (online). There are also models with a built-in stabilizer.
Consider all options.
There are different types of sources
Backup (Back UPS)
Offline UPS for PC does not interact with the line while there is power in it. But when it falls below the critical indicator, the device is connected to work with the battery. The supply voltage comes from a special drive. Moreover, this transition is very fast. This option is reserved.
The advantage of this system is its low cost. Of the shortcomings, it is worth noting the long switching time to power from the drive. Such uninterruptible power supplies are recommended to be used with a normal external network — 220 V. Devices are relevant for a short-term power outage.
Reserve type model
Line Interactive (Smart-UPS)
Linear — interactive uninterruptible power supply for a private house is in many ways similar to a backup option. But in this case, the device is supplemented by an external voltage stabilizer. Such an autotransformer provides a normal power supply. Uninterruptibles of this type are characterized by a long service life and more power than backup type devices.
Such models also have certain disadvantages, for example, the lack of frequency stabilization in normal mode and the penetration of electromagnetic and radio frequency interference from the external network. Such an uninterruptible power supply for the home is used to protect computer equipment from frequent power outages and unstable voltage.
Double Conversion UPS (On-Line)
The most reliable option is an uninterruptible power supply with double conversion of electricity. It allows you to provide a high level of power quality. The device is always connected to the line. If voltage is present, it is converted to direct current, which is used to recharge the batteries.
Feature of work in double conversion of input voltage. In this case, the battery for the UPS is constantly connected between the inverter and the rectifier. The advantage of an uninterruptible power supply is the reliability of operation and the quality of the voltage. The disadvantages include the complexity of the scheme.
Perfect Double Transform Models
Differences in the power scheme
The use of uninterruptible power supplies solves several problems — it provides the computer with uninterruptible power supply, increases the sinusoidality of current and voltage, cuts off unnecessary harmonics, and filters network noise.
The use of a UPS solves several problems — it provides the computer with uninterrupted power supply, increases the sinusoidality of current and voltage, cuts off unnecessary harmonics, filters network noise
This has a positive effect on the durability of the capacitors of the system unit, which prolongs the time of its trouble-free operation.
Passive filters in modern UPSs include varistors that filter out surges and switching surges. Often such interference occurs when there are devices in the circuit with large starting currents (+)
For AC, there are three types of household UPS:
- Reserve (off-line). The computer is powered directly from the mains. When the voltage goes beyond the allowable range, switching takes place within 6-10 ms to the batteries. Such uninterruptible power supplies are equipped with the simplest passive filters from impulses and interference.
- Interactive or line-interactive (line-interactive). Functions similarly to the standby type. There is a voltage stabilizer at the input.
- Online or double-conversion (online or double-conversion). The incoming current is converted into direct current and feeds the batteries, and from them through the inverter there is a reverse transformation into alternating current, which goes to the output of the device. Therefore, the transfer time to battery operation for this type of UPS is zero.
Redundant UPSs are the cheapest and most silent. Interactive devices have slightly faster switching times and are slightly more expensive. Since switching power supplies for computers are not very demanding on the quality of electricity, the use of uninterruptible power supplies of the first two types is acceptable for them.
Online devices are much more expensive. They are used for high-performance stations and file servers with a heavy load. They are characterized by high heat dissipation and a significant noise level.
Powerful uninterruptible power supplies are very noisy, so they are often placed in cabinets or utility rooms — pantries and non-residential rooms
The efficiency of backup and interactive devices is very high (95-99%). For UPSs operating according to the double conversion scheme, this parameter is much lower (80-96%), but there are also expensive models with the ability to use intelligent modes, in which the efficiency increases to 98-99%.
The main technical parameters of an uninterruptible power supply for a computer
If you do not know how to choose an uninterruptible power supply for your computer, then you need to study the important parameters that should be considered. An important point is the location of the device. The vertical arrangement is used for desktop equipment. Rack mounting is also possible.
Specifications on the example of a specific manufacturer
When choosing an uninterruptible power supply for your home in case of a power outage, you need to make sure that the device can handle the load of the connected device. The power indicator of an uninterruptible device should be 20-25% more than the power of the computer. To correctly calculate the required performance, you need to add the values \u200b\u200bof all connected devices.
The power of the UPS depends on the parameter of a certain computer
It takes no more than 5 minutes to save all open documents. With this parameter, you can buy a fairly high-quality device at a reasonable price. The duration of work without electricity is determined by the volume and power of the battery.
Battery life of devices of different series
Number of connectors
When choosing an option, pay attention to the coincidence of sockets at the output of the uninterruptible power supply for the computer and equipment. If network adapters or telephony will be connected to the equipment, then it is important to have additional RJ-11 and RJ-45 connectors. Modern models are equipped with USB and RS-232, which help to establish control from a computer.
Each model may have a specific set of connectors
Equipping the device with software also matters. In many models, protection algorithms are provided at the software level. The advantage of this system is that the files are saved even if the user is not at the computer. Some models are equipped with connectors for connecting peripheral devices.
All the necessary performance indicators of the system are displayed on the display
Ease of management is also important. Some devices are equipped with built-in displays that show all the parameters of the system — power and voltage. Data can also be displayed using special software immediately on a PC monitor.
Absorbed pulse energy
One of the main UPS protection parameters is the absorbed impulse energy, which is measured in joules (J) and is more important for residents of the private sector. The values of the absorbed pulse energy are in the range of 150-500 J.
The higher these values, the more likely the UPS will protect your computer if there is a lightning strike on the power grid or a short circuit in the distribution transformer.
If you live in a private house, then choose a UPS with a higher absorbed pulse energy.
The main manufacturers of UPS for computers
Different manufacturers offer UPS models for a computer, the price of devices depends on the equipment and certain functionality. The most popular companies Huawei, APC, powercomBastion, Helior and Cyber Power. These manufacturers produce high-quality and popular equipment. Focusing on manufacturers, you can choose the best version of the device, taking into account functionality and cost.
For home use and connecting the main types of equipment, the Ippon Back Comfo Pro 600 New option is suitable. For a teenager’s room, the option is more suitable — Powercom WOW 850 U. To equip a home office, the APC by Shneider Electric model is more suitable. If you need to connect large equipment, you can install a device with high power — PComPro 3 S.
Double Transform Models
How to choose the right UPS for your computer: recommendations
When buying a computer, in addition to high performance, you should pay attention to stability.
When choosing a suitable model, it is necessary not only to take into account the technical characteristics, but also various additions:
- short circuit protection is available for almost all models. The function helps to prevent breakdowns associated with the short circuit of the device;
- electronic display helps to control operating parameters — overload, voltage and state of charge;
- the presence of various connectors to connect a modem, printer or fax;
- the cold start option allows you to turn on the uninterruptible power supply even if there is no input voltage;
- forced cooling system.
It is worth taking care of a quick replacement of the battery. It lasts 1-2 years and then becomes useless because it cannot provide battery life. However, the rest of the components can still be used. If it is possible to replace the battery, then you can use the device for many more years.
When choosing an option, you need to take into account the characteristics and capabilities of the equipment
How to choose a UPS for a computer by power
Determine the technical indicators of the computer, as well as decide on additional equipment. Next, calculate the total power. But keep in mind that the equipment power indicator is indicated in watts, and uninterruptible power supplies in voltamperes.
The power of a standard office PC with a monitor, printer and speakers averages 500 watts. In voltmeters it will be — 700 VA. The value of the total power is 800 W, and in voltamperes 1120 VA.
Power is selected taking into account all connected equipment
Choice by type of connection
Uninterruptible power supplies do not have standard outlets. They are equipped with special connectors for cables. In some models, the power also allows you to connect a monitor to an uninterruptible device. The fewer devices connected, the longer the uninterruptible power supply will be able to work during a power outage. Turn on the computer to make sure the unit is working. Then install the software and configure the settings for it to work.
To understand the connection, you need to study the instructions
Selection by input voltage range
The input voltage range defines the allowable mains voltage at which the UPS can maintain voltage without switching to battery power. If you do not know how to choose an uninterruptible power supply, then this parameter is worth paying attention to. It depends on the battery life.
Cold start UPS
The cold start function is declared for most UPSs. This means that you can turn on the computer in the absence of power in the outlet.
In fact, this is not quite a regular mode of operation of the UPS and can lead to the failure of both the UPS itself and the computer. Do not just experiment with this possibility.
The cold start function requires that the UPS be of high quality, with a reserve of power and a good battery. During the start of the computer, a large current surge occurs and it is already better to turn on the monitor after the PC boots up.
It is recommended to use the cold start function only in case of emergency, if you urgently need to get some file from the computer for work.
UPS for a computer — rating of the best models of 2017-2018
A thorough analysis of different models will allow you to choose and buy the right uninterruptible power supply for your home.
Eaton Ellipse Eco El 650 9600
The model is equipped with a cold start option, which ensures short-term operation in the absence of power supply. In stock protection of information connections. There is EcoControl functionality, which is implemented in models with USB. In this case, when the main outlet is loaded, the peripheral equipment is turned off.
- available cold start;
- setting operating modes;
- automatic shutdown of the peripheral device;
- rechargeable batteries are used;
- battery autotest function;
- rack mount.
Of the minuses, it is worth noting the high price.
Functional and simple model
Powercom Wow-850 U
Inexpensive and compact uninterruptible power supply. A device for organizing backup power. The battery will last for 10 minutes. The device is equipped with 4 sockets. An uninterruptible power supply provides protection for network equipment and also helps to save documents. There is a connector for a USB cable on the case. Automatic shutdown is provided if the battery charge drops to a certain value.
The case has a connector for a USB cable. There is an automatic self-test function.
- almost silent operation;
- compact dimensions;
- the presence of euro sockets;
- affordable price.
- not a long battery life;
- output signal in the form of a stepped sinusoid.
Uninterruptible in the form of a simple networker
Review Kazan will say, Kazan: Uninterruptible power supply POWERCOM WOW-850U — Great option for home
Pros: good quality
Cons: Not suitable for the office
Bespereboynik was bought to connect a monoblock, laptop, router and MFP. The UPS has 4 sockets, 3 of which are battery backed and one is simply filtered. The battery lasts a long time. Provides power support for the above devices for more than 40 minutes — verified by experience.
More to feedback:
APC by Schneider Electric Smart — UPS 1500 VA
This option is suitable for gaming computers. Battery charge depends on temperature. Of the features, it is worth noting the service functionality, as well as the dynamic battery life. Especially useful is the control of the main parameters of the system.
The equipment has the following advantages:
- operation from an electric generator;
- all kinds of smart options;
- flexibility of settings;
- combination with any power factor schemes.
Among the minuses, only the high price of the equipment can be noted.
High power model
Reviewed by IVoovl, Belarus: Uninterruptible power supply APC Smart-UPS 1500VA SUA1500I — Reliable and simple
Pros: Reliable, powerful, manageable.
Cons: weighs a lot
When working with these units, I came across many times, as well as with less powerful uninterruptible power supplies from other companies. Why APC Smart-UPS 1500VA? Firstly, the kit includes all the necessary cables for connection and control. A manual that is easy to read. Batteries that really honestly hold their capacity. Software disk. A sheet with the result of his last test is always glued to the top.
More to feedback:
Powercom Raptor RPT-2000AP
This device belongs to the equipment of high power. The output signal has a stepped shape.
- significant power reserves;
- attractive price.
- noisy fan;
- difficult access to the battery compartment.
Uninterruptible for home
Reviewed by JaneAiry, Barnaul : Uninterruptible power supply PowercomRaptor RPT 800A — Does its job 🙂
Disadvantages: instructions and 10 modes on one button.
Since I live in a village where power surges and power outages are not uncommon, it became necessary to purchase a UPS for a new computer.
More to feedback:
Ippon Back Basic
An inexpensive model equipped with a simple AVR. If necessary, an automatic adjustment system capable of reducing or increasing the input voltage. There are connectors for the Shuko euro plug and computer C 13. The shape of the output sinusoid does not allow working with APFC power supplies.
- attractive price;
- good quality;
- quiet work.
- The USB cable is located on the front panel;
- the power cable is not removable;
- no cables included.
Powercom Vanguard VGS 2000 XL
This model is a compromise between quality, price and reliability. If there is an unstable power supply, then bypass technology will help out. It allows you to increase the efficiency of the equipment. Returning to double conversion mode is very fast. Additional batteries are connected to this uninterruptible power supply.
- bypass available;
- separate control sockets;
- ideal output waveform.
The disadvantages include a significant level of operating noise.
Ipon Innova RT 1000
The double conversion model of the input voltage is designed for the maximum load. Management and adjustment is carried out using mechanical buttons and a display. During operation, the display shows the battery level, voltage and frequency. The device is equipped with eight power connectors. Additional battery models can be connected.
- high-quality display;
- stabilization options;
- the ability to connect the battery from the side;
- functional output voltage.
- power connector for a computer;
- noisy fan.
Examples of UPS selection by power
All the values of power and cosφ given in the following examples are conditional. When calculating the power of the UPS, use only the parameters from the technical documentation of your equipment!
UPS selection for a gas boiler
Let’s start with a simple case — choosing a UPS for a single consumer, for example, a gas boiler.
Usually, several capacities are given in the documentation of heating devices at once. Assume the following formulations and meanings:
- Max. useful thermal power — 31 kW;
- min. useful thermal power — 10.4 kW;
- electrical power — 165 watts.
From the name of the parameters it can be seen that the first two characterize the main operation of the boiler, and the third one indicates the watts consumed from the mains, the number of which is the actual load on the «uninterruptible».
Now let’s calculate the required power reserve: 165 x 0.3 = 49.5 watts.
Then we determine the load indicator: 165 + 49.5 = 214.5 watts.
Using formula 1 and assuming cosφ \u003d 0.95, we convert watts to volt-amperes: 214.5 W / 0.95 \u003d 225.7 VA.
As a result, the load indicator will be 214.5 W and 225.7 VA.
Consider the power range of the on-line UPS «Shtil» — the closest to this indicator with a rating of 225 W / 250 VA are the models: SW250, SW250LD, SW250SL and ST250.
UPS selection for heating boiler and circulation pump
Let’s complicate the task and assume that a boiler with the same characteristics works in conjunction with an external circulation pump, the rated power of which is 45 watts.
In this case, the load on the UPS in normal mode will be: 165 W + 45 W = 210 W.
However, we do not forget about the starting currents characteristic of the pump and, having tripled its nominal value, we find the maximum possible starting power consumption: 165 W + 135 W = 300 W.
Based on its value, we determine the load indicator in W: 300 W + 300 W x 0.3 = 390 W.
Due to the difference in cosφ between the boiler and the pump (0.95 and 0.7), obtaining the load rating in VA will require two steps: 165 / 0.95 + 135 / 0.7 = 366.5 VA — total maximum apparent power . 366.5 VA + 366.5 VA x 0.3 = 476.5 VA — load indicator.
Analyzing Shtil products, we come to the conclusion that an on-line UPS of the SW series with an output power of 400 W / 500 VA (models SW500L and SW500SL) is suitable for a pump-boiler pair.
Some heating boilers immediately have a built-in circulation pump. If your device belongs to this category, we recommend that you find out whether the value of electric power given in its characteristics takes into account the starting currents of the built-in pump. If you have any difficulties, consult with a specialist!
How to choose and buy a UPS for a computer: prices, catalogs
If you have not yet decided on the model, then in the table you can see the prices for uninterruptible power supplies from some manufacturers.
|Average price, rub.
|Ippon Back Basic 1050 IEC
|The output power indicator is 1050 VA / 600 W. 3 output connectors. There is USB.
|APC by Schneider Electric Back-Ups
|interactive model. Charging time 8 hours. Power rating 650VA/390W. 3 output connectors.
|Eaton 9130RM 3000BA
|Double transformation model. 9 output connectors. There is a possibility of installation in a rack.
|Bastion Teplocom 300
|Backup device. 1 output socket. Power — 300 VA / 270 W.
|Stark Country 1000 Online
|Double transformation model. 2 output connectors. Power indicator — 1000 VA / 800 W.
|Powercom Raptor RPT-1000 IEC
|interactive model. Output power — 1000VA / 600W. Charging time 4 hours. 3 output connectors
If you are not satisfied with the presented models, then you can find an option yourself. Just before buying a device, you need to check its compatibility with the power supply. We hope that our review will help you make the right decision.
How to choose a voltage stabilizer 220V for the home. You are familiar with the problem of power outages, which manifests itself in the flashing of light bulbs. In the article we will talk about how to choose the right 220v voltage stabilizer for your home in order to forget about this problem once and for all?
Choosing a UPS for a PC
Passive UPSs remain quite practical, they are inexpensive and have a relatively small battery capacity — up to 8 A / h. This indicator is quite enough for most PCs with a power consumption of up to 500 watts. Determining the power rating of a UPS is not particularly difficult, since such a technique has an efficiency level of no more than 80%, and a UPS with a capacity of up to 600 VA is quite suitable for the above computer.