Selection of UPS for the server. Uninterruptible power supply for the server. What backup time is required for server hardware?

Passive(stand-by, the name “standby” can also be used, the official name of the type is VFD, Voltage and Frequency Dependent) - the most affordable type of UPS, so named because the battery and inverter (circuit that converts direct voltage into alternating voltage) in in good condition when operating from the network, they are completely disconnected from the load at the output, and switching to them occurs only in the event of a loss of power at the input (or its voltage exceeds acceptable limits), the switching time from operation from the network to operation from the battery is usually tenths of a second, and the output signal has the form of a square wave or the simplest approximation of a sinusoid.

UPS of this type, as a rule, do not protect the connected equipment from interference when operating from the network; it is also strictly forbidden to connect to them devices that have a significant component of inductive load, namely: transformer power supplies (except for low-power power supplies for modems, etc.) and electric motors alternating current, since supplying a non-sinusoidal signal to such devices is fraught with their failure, i.e. They work correctly only with switching power supplies, which are equipped with all modern PCs, monitors and a significant part of the peripherals and household equipment.

However, even in the case of switching power supplies, feeding a meander or trapezoid instead of a sine wave leads to an increased amount of noise at the internal outputs of the power supplies of devices operating from such UPSs. Therefore, it is not recommended to connect audio-video equipment to these UPSs, as well as expensive or sensitive PCs; their main use is home and office PCs.

Among APC products, this type includes the following series of UPSs that are optimal in terms of “capabilities/price” criteria:

At the beginning of 2010, APC released an updated model of the RS series - Back-UPS RS 550 () This device has a new interesting function energy saving. It is implemented in the form of “dependent” UPS output sockets, which are de-energized if you turn off the computer connected to the “main” sockets of the device. In this way, you can save energy by automatically turning off equipment such as hubs, modems, routers and other peripherals that are usually unnecessary when the computer is not working. Another important innovation that makes using UPS more convenient is the presence of a liquid crystal display that displays detailed information about the status of the UPS and the power grid.

Double conversion(double conversion, also called “online UPS”, the official name of the type is VFI, Voltage and Frequency Independent) - a UPS in which the battery is constantly charged from the mains and supplies current to the inverter, due to which the load connected to it is completely galvanically isolated from the electrical network for general use and is constantly powered by a pure sine wave.

These UPSs do not have any restrictions on the types of connected equipment if its maximum power consumption does not exceed the capabilities of the UPS. Their main application is control and measuring equipment, critical communications equipment, high-reliability servers and other applications where the highest quality and reliable power supply is required. APC offers the following series of UPS of this type:

(Sometimes referred to as Smart Online) is a series of UPS for the most critical applications, providing the most stable output voltage in any conditions.

Every year, the problem of protecting the power supply of computers and network equipment becomes more and more urgent. It is no secret that now many enterprises and companies are widely using cloud technologies, facilities remote access and so on. decisions in daily activities. Thus, ensuring the smooth functioning of servers, data storage systems and communication equipment is a prerequisite for normal operation. Forced downtime of even a few minutes can lead to serious operational disruptions and, as a result, significant losses. In addition, power protection helps minimize the risk of data loss due to a sudden power outage.

Thus, power protection devices are an important element of the IT infrastructure of any modern enterprise or organization. In this review we will talk about five source models uninterruptible power supply(UPS) with a capacity of 1000 to 3000 VA, which are designed to protect the power supply of computers, servers and communications equipment.

All models described in this review refer to online uninterruptible power supplies. This means that during operation, the alternating current received from the electrical network is converted first into direct current, and then back into alternating current of a given voltage and frequency. If the voltage deviation in the network exceeds permissible limits, the UPS switches to battery power, converting the direct current received from them into alternating current. This circuit is highly reliable and ensures the absence of any transient processes (such as short-term dips, changes in shape, etc.) both when switching to battery power and when switching back to mains power. That is why online UPSs are most often used to protect servers, network switches, etc. equipment that operates around the clock.

The fundamental disadvantage of such UPSs is their lower (compared to offline models) efficiency due to inevitable losses during double energy conversion, which is carried out when powered not only from batteries, but also from the mains. That is why many currently produced online UPSs have an energy-saving function that automatically switches the device to bypass mode when the external power supply parameters correspond to the range of values ​​specified in the settings.

Taking measurements

In the process of testing uninterruptible power supplies, we used a PC simulating the load, as well as measuring equipment.

The following PC configuration was used:

This PC was connected to the UPS output and acted as an active load. To increase power consumption, the FurMark and AIDA64 Fpu stress test packages were launched on the PC, which ensured maximum load as central processor, and the graphics subsystem. According to the hardware wattmeter, at the moment of maximum load, the PC described above consumed an average of 350 W.

To simulate problems in the electrical network, we connected the UPS to the outlet through a laboratory autotransformer (LATR). Thus, it was possible to change the voltage at the UPS input. We measured the current value of this parameter using a digital multimeter connected to the LATR output.

Before performing measurements, the output voltage was set in the UPS settings to 220 V.

To evaluate the voltage waveform at the UPS output, we used digital oscilloscope BORDO B-421, produced by the research and production company "AURIS", and Oscilloscope software version 2.0.7.74. In order to reduce the influence of external noise, the oscilloscope was connected to a laptop running on batteries. The voltage from the UPS output was supplied to the input of one of the oscilloscope channels through a divider. By manually switching the UPS to bypass mode, we received an oscillogram of the voltage in the office power supply. Due to the presence of many devices connected to it, the shape of the resulting curve differs markedly from a regular sine wave.

Having switched the UPS to online mode, we recorded the voltage waveform generated by the built-in inverter.

The model is part of the Online S series, which features about two dozen online UPSs in various designs, which are designed to ensure stable operation of critical servers, data centers, workstations and telecommunications systems.

The CyberPower OLS2000ERT2U UPS package includes: brackets for rack installation, a stand for installing the case in a vertical position, power cables for connecting to the mains and protected devices, an interface USB cable, RJ-11 telephone cables, warranty card, instruction manual, and software CD.

The CyberPower OLS2000ERT2U UPS is made in a black metal case, designed for installation in a standard 19-inch rack. Its dimensions are 88x438x610 mm; weight - about 30 kg. When placed in a rack, the chassis height corresponds to standard size 2U.

The front panel contains a small LCD display and four control buttons. The front panel is made of durable thick plastic, painted black. It has a ventilation grille with longitudinal holes for air flow from outside.

Connectors for connecting loads and interface cables are located on the rear panel of the CyberPower OLS2000ERT2U. On the left are eight IEC C13 sockets for connecting protected devices, as well as one IEC C20 socket for connecting the UPS to the mains. Next to the latter there is a power breaker button (Reset). The output sockets are divided into two groups, one of which can be selected as the main one, the other as an additional one. The sockets of the additional group are designed to connect non-critical loads that can be de-energized when the external power is turned off.

For data exchange with a PC there is a USB interface and a serial RS-232 port. In addition, there is a special slot (Intelligent Slot) for installing an optional expansion card, which allows you to control the device from a remote workstation via the network using SNMP/HTTP protocols. Nearby is a green block with an Emergency Power Off (EPO) jumper. There are also two RJ-45 connectors for through-connection of a network or telephone cable through a filter that protects the line from impulse noise.

Next to the Intelligent Slot, closed with a plug, there is a connector for connecting external battery modules BPSE72V45ART2U.

There is also one 80mm fan installed on the rear panel to evacuate heated air from the UPS case. The rotation speed changes automatically depending on the operating mode, temperature and load level.

The built-in display screen of the UPS displays information about the current load, battery charge level, temperature, etc. The display also shows messages about various faults - thus System Administrator can quickly respond to emerging problems.

To the right of the screen are two small holes that contain screws. By unscrewing them, you can remove part of the front panel and gain access to the battery compartment.

Under the cover there is a connector through which the batteries are connected to the UPS. By disconnecting it and unscrewing three more screws, you can remove the plastic container with batteries from the case.

This model is equipped with maintenance-free sealed batteries, which allows them to be replaced by the user. The OLS2000ERT2U sample provided for testing was equipped with six B.B.SH1228W rechargeable batteries with a capacity of 7 Ah and a rated voltage of 12 V. The batteries in the unit are connected in series.

The design of this UPS provides the ability to connect up to three external CyberPower BPSE72V45ART2U battery modules, each of which contains 12 batteries, grouped into two sections (six in each). It increases time battery life UPS at full load(1800 W) for more than 1 hour.

As measurements taken with an oscilloscope have shown, when operating on batteries, the UPS provides power to the devices connected to the outputs with a voltage of the correct sinusoidal shape. Changing the load does not distort the output signal shape. Like other online-type models, CyberPower OLS2000ERT2U provides switching of power modes (from the mains and from batteries) without any transient processes (pulses, short-term power outages, etc.).

There is a function for emergency switching of the UPS to bypass mode in case of output overload (more than 120%) or any malfunction.

One of the features of this model is the low threshold values ​​for switching to battery mode and back. According to the results of measurements, at a load of 10% of the rated load, the UPS switches to battery power when the mains voltage drops to 140 V. Operation from the mains is restored when the mains voltage increases to 155 V.

At a higher load (about 80%), the UPS switches to battery power when the mains voltage drops to 185 V.

As for battery life, then this model When connecting a test PC, it worked on batteries for 39 minutes. This fully corresponds to the stated characteristics.

The CyberPower OLS2000ERT2U model uses proprietary energy-saving GreenPower UPS technology, which reduces power consumption and heating of internal components.

This model is supplied with CyberPower PowerPanel Business Edition software. It can be used to control various settings UPS, including setting the output voltage value, selecting the voltage range to switch to bypass mode, etc.

One of the features of CyberPower PowerPanel Business Edition software is the ability to be installed in different versions. To manage a UPS connected to one PC, this software is installed as a so-called agent.

If the UPS is used to protect several PCs, then the server version of CyberPower PowerPanel Business Edition is installed on one of them (the one to which the UPS is connected via USB), and client applications are installed on the remaining computers.

With an optional SNMP card, it is possible to manage UPS settings from a remote workstation using CyberPower PowerPanel Business Edition software or a regular web browser.

Among the advantages of the CyberPower OLS2000ERT2U model, it is worth noting convenience and ease of operation, an informative control panel display, high reliability and ample options for managing settings.

The model is part of the Eaton 9130 line, which includes UPSs with power from 700 to 6000 VA in various designs (tower and rack), as well as external battery modules for them. These include Eaton 9130 RM series devices with power from 1000 to 3000 VA, manufactured in housings for installation in a standard 19-inch rack. The Eaton 9130 line of UPSs are designed to protect power supplies to workstations, file servers, communications equipment and other critical loads.

The Eaton 9130 3000RM UPS (model index PW9130i3000R-XL2U) is housed in a 438x86.5x600 mm case designed for installation in a standard 19-inch rack. The power of this model is 3000 VA (2700 W).

The delivery set includes: power cables (one for connecting to the mains and two connections for protected devices), a tee extension cable with three Schuko sockets (connected to one UPS output), a set of rack mounting brackets, USB and RS-232 interface cables, user guide, brief instructions commissioning instructions, as well as a CD with software and documentation in in electronic format.

The front panel of the UPS case has a monochrome LCD display equipped with backlight, four buttons and LED indicators. The screen can display the current values ​​of a number of parameters (voltage and frequency at input and output, load level, etc.). The built-in menu allows you to manage the settings and operating modes of the UPS.

In the event of a power failure or deviation of the external power supply parameters beyond acceptable limits, the UPS switches to battery power. Since rechargeable batteries are constantly undergoing a process of self-discharge, to compensate for this undesirable phenomenon, the batteries are continuously charged with a low current. A weak current constantly passing through the battery causes changes in the chemical composition of the active substances, corrosion of the grid and shedding of the active mass of the positive plates. The consequence of these processes is a decrease in the actual capacity of the batteries and a reduction in their service life. The Eaton 9130, like many modern Eaton UPS models, features ABM (Advanced Battery Management) battery charge management technology, which allows for longer battery life. According to the manufacturer, this solution can extend the life of batteries by 50%. Thanks to its patented three-stage charging technology, ABM technology optimizes recharging time and eliminates overcharging beyond the batteries' rated capacity, and also provides advance (up to 60 days) warning of possible battery failure. Simply put, in a UPS with ABM technology, the batteries are not constantly recharged, but only in cases where it is necessary.

Like many modern online models, the UPS of the Eaton 9130 line has an energy-saving function. When activated, the device automatically switches to bypass mode when the external power supply meets the specified criteria. As soon as any abnormalities occur, the UPS switches to online mode. This solution makes it possible to reduce unproductive losses of electricity in conditions where the frequency and voltage in the electrical network do not have significant deviations from the norm.

This model also provides the ability to automatically switch to bypass mode when overloaded or in the event of a malfunction.

To connect protected devices, a total of 9 sockets are installed on the rear panel of the UPS: eight IEC C13 and one IEC C19. They are divided into two groups, the power supply criteria for which can be set separately. The first combines four IEC C13 sockets located in the top row and one IEC C19. The second group includes four IEC C13 sockets located in the bottom row.

For data exchange with a PC there is a serial RS-232 port and a USB interface. If necessary remote control and monitoring, the UPS can be equipped with an optional SNMP card. The slot for its installation is located under a plug with right side rear panel of the case.

Next to the connector for connecting an additional battery pack there is a light green block with an emergency power off (EPO) jumper.

The Eaton 9130 3000RM sample presented for testing was equipped with six maintenance-free CSB HR1234W F2 batteries with a capacity of 9 Ah with a nominal voltage of 12 V, which are connected in series and placed in a transparent plastic container.

Access to the battery compartment is through the front panel of the case. The design of the Eaton 9130 model allows for battery replacement in bypass mode without disconnecting power to the load.

To increase battery life, it is possible to connect an additional external battery pack that can be purchased. To connect it, there is a special connector on the rear panel.

During the tests, it was found that the UPS switches to battery operation when the mains voltage drops to 155 V. When this parameter increases to 165 V, the device switches back to mains power.

When connected to the load output in the form of a test PC, the operating time of this UPS on batteries was 42 minutes.

As shown by measurements carried out using an oscilloscope, when operating online, the UPS generates an output voltage of the correct sinusoidal shape without any distortion. As with other models of this type, no transient processes reflected in the shape of the output signal were noted at the time of switching to battery power and back to mains operation.

The included CD allows you to install Intelligent Power Protector, Intelligent Power Manager, Eaton UPS Companion, and Eaton Network Management Card Utility.

Intelligent Power Protector software allows you to work with UPSs connected both directly to a PC (via USB or RS-232) and to other computers on the network. This software allows you to perform a graceful shutdown of protected equipment in the event of an extended power outage, thereby preventing data loss and damage. file systems. In addition, condition monitoring and alarm functions are provided. Support for configuration of redundant power supplies and parallel UPSs has been implemented. The settings are accessed through a regular web browser.

The Intelligent Power Manager application is designed to remotely monitor and manage one or more UPSs. A simple and convenient graphical web interface provides information about the status of the power supply and various parameters serviced UPS in real time. The auto discovery function allows you to automatically discover devices on the network. It is possible to integrate with vCenter, Microsoft SCVMM and XenCenter.

Eaton UPS Companion software is designed to monitor and manage a UPS connected directly to a home or office PC.

Finally, the Eaton Network Management Card utility provides remote monitoring status and operation control of UPS equipped network card SNMP

FSP Galleon 2K

The editors would like to express their gratitude to the research and production company AURIS for kindly providing the BORDO B-421 digital oscilloscope for carrying out the necessary measurements.

UPS IMPULSE series FREESTYLE 11

Since the uninterruptible power supply market remains virtually unchanged over time, we decided to supplement our review with one interesting new product. The UPS in question was manufactured by the young Russian company TsRI "IMPULSE", which, together with China and Turkey (localization level more than 70%) is developing and producing uninterruptible power supplies. Its range includes not only household models, but also devices aimed at installation in server rooms of large and medium-sized companies. In addition, there are also industrial solutions.

In this review we will look at new model On-Line UPS with double conversion of the FREESTYLE series with a power of 3,000 VA (2,700 W), which can be installed not only on the floor, but also mounted in racks, since as standard it is manufactured in a universal Rack/Tower case.

The FREESTYLE 11-3 model is made in a case measuring 440x720x86.5 mm, which allows it to be mounted in a 19-inch rack. In addition, this UPS can be installed separately in both horizontal and vertical positions. In the rack, the device occupies a height of 2U.

External view of the UPS FREESTYLE 11-3 case

On the front panel of the case, which is typical for such devices, there is a monochrome LCD display for monitoring the operation of the UPS and three buttons for controlling the device. The blue backlit display shows the values ​​of the main parameters and the operating mode.

UPS control panel FREESTYLE 11-3

Although the display panel itself does not rotate, since it has a square shape, you can use the control keys to rotate the image it displays by 90°.

The delivery package for this model includes: the UPS itself, network cable(IEC-C19), IEC-C13 load cables (2 pcs.), IEC-C20 universal plug, USB cable, software disk, floor mounting supports (2 pcs.), front mounts for 19" rack mounting ( 2 pcs.), instruction manual, warranty card (two years warranty).

Rear panel of the UPS FREESTYLE 11-3

As with all UPSs of this type, all connectors for connection external devices submitted to back panel housings.

Upper part of the rear panel of the FREESTYLE 11-3 UPS housing

At the top of the rear panel of the case there is: an EPO emergency shutdown port, an RS-232 port, a USB port, two RJ-45 network connectors with built-in protection, a universal slot cover for connecting an SNMP or RELAY card, which are purchased separately. Also in special version of this device A built-in relay contact card is available to maintain the ability to install it together with SNMP.

The middle part of the rear panel of the UPS FREESTYLE 11-3

There are two AB8025M12 fans located in the middle of the rear panel, which provide good airflow. Their noise level is up to 49 dB, which is significantly less than the noise reproduced by the server and does not create significant noise interference. It should be noted that the operation of these fans is controlled by internal electronics, so their rotation speed depends on the current load. In battery mode, the fans almost always rotate at full speed to ensure reliable operation of the inverter. Under the fans there is a ground screw and an automatic fuse.

The lower part of the rear panel of the FREESTYLE 11-3 UPS housing

At the bottom there are: input connector - C20, output connector for 16 A and two vertical block connectors (segment), one of which is intended for low-priority load (left), and the second for high-priority load (right). Both segments have four connectors each.

Internal structure of UPS FREESTYLE 11-3

The internal layout of the element board ensures maximum compactness while maintaining ease of maintenance and repair and ensures the most comfortable temperature conditions for the operation of all UPS components. The main board is located at the top of the case. All auxiliary boards, as well as control boards and regulating chokes, are placed separately and in case of repair, can be quickly replaced. There are also two aluminum radiators located here, which ensure effective dissipation of heat generated by the power elements of the UPS when operating in any permissible modes. One of them is additionally blown by an internal fan, which ensures a stable temperature regime inside the case.

Installation of individual boards and element base of UPS FREESTYLE 11-3

UPSs are built on the most modern element base. Monitoring and control circuits use high-speed digital signal processors (DSPs) to provide high speed and precision control of power stages. As power semiconductor elements MOSFET and IGBT transistors are used in the rectifier and inverter, which corresponds to the high reliability required for devices of this type. Small additional radiators are installed where necessary.

The battery pack is located at the bottom of the case, in a separate compartment (when the UPS is installed vertically). It consists of six 12 V batteries, the total DC bus voltage is 72 V. The battery manufacturer is Yellow Battery, which has been producing these products for many years. They are characterized by high reliability, confirmed by the use of these batteries as part of critical load power protection systems at many important facilities. Subject to optimal temperature conditions at the installation site of the UPS, the batteries provide the ability to autonomously supply power to the load during network outages throughout its entire service life. Therefore, it is advisable to install the FREESTYLE 11-3 UPS in rooms equipped with air conditioning.

Battery pack UPS FREESTYLE 11-3

The battery compartment is accessible from the front of the UPS. At the same time, it is possible to “hot” replace batteries. To replace the batteries, you need to remove the front cover, disconnect the power cord leading from the batteries and unscrew the screws on the protective panel. After these steps, the battery pack can be easily removed even without turning off the UPS. Here, under the front cover, there are 2 connectors for connecting external and internal battery packs. A total of up to four external battery packs can be connected to the UPS. Each subsequent battery pack is connected to the previous one. This way you can increase the battery life of the device.

UPS FREESTYLE 11-3 is of the OnLine type (double conversion), the output of the device provides a stable rated voltage that does not depend on the parameters of the supply network. The source also has a built-in electronic bypass circuit, activated automatically when the efficiency increasing mode is turned on, in case of overload or device malfunction, or manually.

During the tests, it was found that the UPS switches to battery operation when the mains voltage drops to 125 V. When this parameter increases to 155 V, the device switches back to mains power. Note that this model is characterized by a very low threshold value for switching to battery power, which is very suitable for Russian power grids, which are famous for problems with voltage drops.

When connected to the output load in the form of a test PC (a standard multiprocessor 2U server with a power consumption of about 800 W), the battery life was 21 minutes.

Voltage oscillogram at the UPS output when operating online (battery powered)

Measurements carried out using an oscilloscope confirmed that when operating online, the UPS generates a correct sine wave output voltage without any distortion. As with other models of this type, there was no observed influence of transient processes on the shape of the oscillogram at the time of switching to battery power and back to mains operation.



To control the operating modes and settings of the UPS from a PC, Upsilon2000 software is included in the package. This decision supports both direct connection and the ability to control from a remote workstation via a local network.

Based on the presented diagrams, the output voltage of the FREESTYLE 11 UPS fully complies with the declared characteristics.

It is worth noting that the FREESTYLE 11-3 UPS is available both with and without batteries. The product costs US$550 without batteries and US$680 with built-in batteries.

In many enterprises, in order to organize efficient and productive work simultaneously, modern IT solutions are installed at all workplaces, working directly with one or several servers.

The stability and functionality of the entire enterprise depends on the reliability and continuity of the server, so this type of equipment requires flawless operation and the absence of accidents in the main power grid.

While progress around the world reaches new heights and brings full automation into our lives, data centers, storage systems and server rooms have become the real electronic “heart” of any company.

All reports compiled by your employees, all databases, strategic information and other information stored electronically are stored there - in the “heart” of any company, i.e. servers, storage systems and data centers.

In order for your computer system worked efficiently and reliably, it is necessary to install an uninterruptible power supply (UPS) in the server room. Therefore, a UPS is a vital necessity in conditions unstable work our electrical networks.

Even a short-term network outage can destroy expensive equipment or lead to the loss of critical data that cannot be recovered.

UPS types for servers

There are three types of UPS:

First - off-line (stand-by) comes into operation only in the event of a power outage in the network. In the event of power failures or in the event of its complete absence, a switch is activated in the UPS, which in turn connects a circuit with a battery and an inverter for power from the battery. The disadvantage of this type of UPS is that switching power from the mains to the battery requires certain time, due to which there is a small voltage gap in the circuit to the consumer. Voltage surges are also possible, while most consumer power supplies do not have voltage stabilizers, which may result in impulse voltages, which will subsequently lead to malfunctions of electronic equipment or even to its breakdown. The lack of output voltage regulation is also a significant disadvantage of this type of UPS.

The advantages of this type of UPS include a fairly high efficiency, since during normal operation of the electrical network, the UPS consumes energy only to power its circuit and recharge the battery if the battery is discharged.

The second type of UPS used for installation on a server

-On-Line. The device supplies the server with electricity continuously, charging its rechargeable batteries, and the electricity is passed through the rectifier, as a result of which the time required for switching is practically zero. Next, the inverter is switched on, which in turn converts direct current into alternating current, while providing the required alternating voltage at the output. In the case of a stable voltage in the electrical network, the output current of the rectifier is sufficient to operate the inverter and recharge the battery. If there is no voltage, the inverter is powered by the battery and continues to supply alternating voltage to the end user. Depending on the power of the consumer, the battery can provide the inverter electric shock from five minutes to several hours.

Thus, On-Line UPS provide an ideal output voltage in case of any problems in the electrical network and are characterized by zero switching time from normal to autonomous mode and back without transients in voltage.

The disadvantages of the On-Line UPS include low efficiency, since part of the power is spent on powering the rectifier and inverter.

Third - Line Interactive represents intermediate option Off-line and On-line UPS. Its switching time is 3-15 milliseconds. Line Interactive UPSs are also used to protect servers and PCs, but unlike On-Line solutions, there is incomplete filtering of the network voltage from interference and surges, i.e. interference generated by the load is passed back into the network, which negatively affects the consumer’s power supply. Also, as disadvantages, one can note an abrupt change in the frequency, shape and magnitude of the output voltage when the battery is switched. Line-interactive UPSs occupy an intermediate position between simple and relatively cheap backup sources (Off-Line) and highly efficient double-conversion UPSs (On-Line).

Protection of devices such as file servers, storage systems, data centers and telecommunications equipment is currently carried out with using a UPS with the On-Line or Line Interactive scheme, since these solutions provide:

Maximum filtering of mains voltage from interference

Minimum switching time to batteries

Stabilization of the shape and magnitude of electrical voltage

The StoreServ company offers its customers reasonable and economically profitable offer on UPS solutions for server rooms, data centers and storage systems. Our company's product range includes global brands whose quality speaks for itself: APC, EneltPro, Tripp Pite, Eaton Powerware, POWERCOM and many others. In the company's portfolio big choice UPS of various capacities, designs, purposes and pricing policies.

Our company’s specialists will be happy to help you make right choice and selection of equipment for your current tasks!

The choice of an uninterruptible power supply becomes relevant for every owner of expensive home appliances under conditions of unstable power supply.

The following failures and malfunctions in the electrical network may prompt you to the question “how to choose an uninterruptible power supply”:

  • sudden complete power outage;
  • a sharp “dip” in voltage – the signal disappears for a short time;
  • increase in voltage - jump up;
  • voltage reduction to nominal value;
  • occurrence of radio frequency and electromagnetic interference;
  • appearing high-voltage pulses;
  • high frequency pulse signals;
  • transient switching;
  • various distortions in a sinusoidal voltage signal.

An uninterruptible power supply can eliminate the negative consequences of these phenomena. Due to the widespread problems with power supply, many are wondering which uninterruptible power supply to choose for a boiler, and how to choose a UPS for a computer. What requirements should an optimal UPS meet that is not a waste of money? We brought 9 simple tips, which you can rely on when deciding which UPS to choose.

Tip 1: Determine what power problems you are facing

When deciding which UPS to choose for a gas boiler or how to choose the right UPS for a server, the very first step that is required of you is to identify the most common problems in the power grid. Uninterruptible power supplies released on the modern market have a significant spread in technical specifications and at cost. Therefore, the chance of making a mistake and overpaying for an overly powerful unit is the same as the chance of choosing an uninterruptible power supply that is not reliable enough.

Please note:

  • Are the light bulbs in the apartment/house/office blinking?
  • How often do complete unplanned power outages occur?
  • whether the voltage jumps so much that electrical appliances turn off or restart.

Tip 2: Decide on the level of UPS reliability you need

There are 3 UPS production topologies, depending on which the output voltage varies, the time it takes for the device to switch to battery mode, and the voltage change when switching to battery operation. To ensure that the operation of equipment is not interrupted by sudden power failures, the choice of UPS for a computer or other devices should be an uninterruptible power supply with a switching time to battery mode of less than 10 ms.

1. Backup uninterruptible power supplies (Standby, Off-line, Back-UPS).
The answer to the question of which UPS to choose for your computer. If you do not have a gaming station or a complex office equipment unit, then the simplest type of UPS - a backup - will be an excellent economical option. It will provide equipment with 5-7 minutes after a power outage, and this time is enough to correctly terminate simple programs and processes and safely shut down the PC.

Before choosing a backup UPS, make sure that your network does not experience large voltage fluctuations (175-190 V). In this case, the UPS, without a stabilizer, will constantly switch to battery mode, which will shorten the life of its battery.

2. Line-interactive UPS equipped with an automatic voltage regulator. This is the choice of an uninterruptible power supply for a computer or even an entire server room in case of strong surges in voltage levels. The device corrects the output voltage shape and stabilizes it. Compared to backup UPSs, linear ones are more expensive, but also more reliable in protecting your equipment. By choosing this option, you can choose an uninterruptible power supply for a heating pump, as well as for oversized, but complex and sensitive equipment and critical applications.

3. UPS with double voltage conversion topology (On-line, double conversation)– devices with the most high degree reliability and protection of your equipment. There is no better way to secure an uninterruptible power supply for a gas boiler than to choose an online device. It continuously converts the incoming energy into a stable (fluctuations of no more than 1%) DC voltage. The disadvantage of such devices is their high cost: it is advisable to use such devices in large data centers, medical institutions and enterprises.

Tip 3: The power of the UPS should be 20-30% greater than the power of the system

The best possible advice on how to choose an uninterruptible power supply is to take into account the power reserve. If the UPS is selected incorrectly based on power, and more powerful equipment is connected to the uninterruptible power supply, this will lead to the uninterruptible power supply shutting down due to overload of the equipment itself. How to choose an uninterruptible power supply for a computer: calculate maximum power the entire load (together with peripheral devices) and select a UPS with a rated power that is 20-30% higher than the obtained value. Using the same principle, you can calculate how to choose a UPS for a gas boiler.

Looking for an uninterruptible power supply? Which one should you choose to ensure that the protected equipment is not damaged due to power surges? If you are figuring out how to choose a UPS for your PC, then regular computer 5-7 minutes are enough to save current documents and correctly close all applications and programs. This is the average time provided by any modern power source. But if we are talking about more complex and heavy-duty programs, then there is nothing else to do but choose a UPS with a longer battery life.

The backup time can be extended by installing additional batteries. If necessary, you can decide which UPS to buy: models with support external batteries equipped with special connectors.

Tip 5: Make sure you have the software

Before choosing a UPS for your computer, it is logical to make sure that this computer itself will run special software for installing, setting up, managing and monitoring the UPS. Software will allow you to save data when terminating non-standard programs, complex applications. Even if you are not present in the room near the computer during a power outage, your data and equipment will be safe. complete safety under reliable protection uninterruptible power supply.

How to choose the right UPS? Make sure it has sufficient capabilities to protect not only your computer, but also peripheral devices. If the UPS is equipped with connectors for telephone lines, then your fax and modem will also not be afraid of voltage surges. Destructive interference can occur even during a thunderstorm: if the modem is connected to an uninterruptible power supply, it will easily withstand this test.

Tip 7: Prefer UPS with clear controls

This nuance is especially relevant for home use of uninterruptible power supplies. In addition to the question of how to choose, you will also have to face the need to independently manage this unit later. Choose models with an intuitive interface and a convenient LCD display for displaying information. You can at least find the meaning of the symbols on the screen in the UPS operating instructions and understand what the device is trying to communicate.

When deciding which UPS to choose for a boiler, computer or other home appliances, choose a model with replaceable batteries. The UPS battery life is no more than 3-5 years, and the battery module accounts for almost 50% of the cost of the entire device. It is cheaper to buy a new battery than to replace the entire UPS!

Tip 9: Find a suitable location for the UPS in your apartment

Uninterruptible power supplies are very noisy during operation (40-45 decibels), so placing the device in the bedroom is not recommended. best idea. Even with how to choose an uninterruptible power supply for a boiler and place it, difficulties may arise. It is important that the equipment (UPS and external) does not overheat, otherwise it will fail ahead of schedule. Try to place each piece of equipment at a distance of at least 1 meter from another building so that the operation of the batteries does not lead to overheating from the adjacent unit.

Today, servers have become an integral part of accounting, data storage and communications systems. This equipment is reliable and can operate around the clock for years. However, he also has weak side– increased susceptibility to voltage surges and power failures. If such a situation occurs, the server may completely fail, which will lead to the loss of important information and, as a result, losses. An uninterruptible power supply will help you avoid this problem. In the Ritm-IT online store you can buy a UPS (UPS) for a server at a low price in Moscow.

Main criteria for selection

First of all, you need to understand that UPSs for servers are significantly different from those intended for domestic use. Most households and office computers connect to uninterruptible power supplies such as Back-UPS. They are able to provide power during a complete power outage, but are unable to protect equipment from interference in the electrical network and sudden voltage drops, which can be detrimental to the server.

To fully protect such equipment, line-interactive UPSs are used that are resistant to the following problems:

  • short circuits;
  • significant overloads;
  • high voltage surges;
  • long-term decrease in voltage;
  • short-term surges;
  • instability of the output voltage;
  • interference;
  • complete power outage.

In addition, server UPSs are highly energy efficient, resulting in significant savings on energy bills.

The ideal option is uninterruptible power supplies that operate on the on-line principle with a double electricity converter. They, like linear-interactive devices, provide full protection, but are distinguished by a faster transition to offline mode.

How to buy UPS for a server?

The cost of an uninterruptible power supply (UPS) for a server directly depends on its type and features. However, this amount is in any case several times less than the cost of damage that can be caused by voltage instability in the power grid.

The Ritm-IT company offers everyone to buy an inexpensive uninterruptible power supply for a server with delivery throughout Russia. The assortment includes a wide selection of models, including those from 2019. Our specialists will help you choose the type of equipment and answer any questions. All products are covered by a guarantee, and discounts are provided to wholesale buyers.



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