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Review of the line-interactive Systeme Electric Back-Save BVSE800RS UPS with built-in 5-volt charger

29.12.2023 10:39


For the entire line it is stated:

  • output voltage in the form of a modified sinusoid,
  • the presence of a built-in stabilizer or AVR (Auto Voltage Regulation),
  • The UPS is protected from overload, discharge and overcharging,
  • protection of loads from power surges,
  • USB-B communication port,
  • built-in charger for smartphones with battery support, USB-A connector,
  • automatic shutdown of the computer using control software,
  • autostart and cold start functions,
  • LED status indicator and audible alarm.

The number of output sockets for models in the line is either three CEE7/4 (or Schuko, with two side flat protective grounding contacts), or six C13 (IEC 60320), all of them are connected to the inverter/AVR and are provided with uninterruptible power.

The cable for connecting to the AC mains is non-removable for all three models.

What is not stated directly:

  • about compatibility with loads whose power supplies have active power factor correction (Active PFC),
  • about support for the Smart Battery standard.

In addition to the standard safety warnings, the instructions contain two unusual items:

  • “It is necessary to make sure that the total leakage current of the UPS and connected loads does not exceed 3.5 mA”  — I wonder how this is proposed to be done in a regular office, not to mention home use?
  • “Never connect laser printers or scanners to UPS sockets”  — if everything is clear with laser printers (consumption, especially peak consumption, is too high), then it remains a mystery why scanners, which require very, very moderate power, were not pleased; Perhaps laser MFPs were meant, but that's a completely different story.

Parameters and equipment

The table shows the declared characteristics of the model in question, taken from the user manual and the official website.

Systeme Electric Back-Save BVSE800RS
Input voltage (nominal)220/230/240 V
Input voltage range170-280 V
Input voltage frequency50/60 Hz ±5 Hz
output power800 VA / 480 W
Output voltage (nominal)220/230/240V ±10%
Output voltage frequency50/60 Hz ±1 Hz
Automatic Voltage Regulation (AVR)There is
Output waveform when running on batteriesmodified sine wave
Battery life per load25% — 12 minutes 30 seconds
50% — 2 minutes 12 seconds
75% — 48 seconds
100% — 1 second
Switching timetypical 2-6 ms, max. 10 ms
Function for starting equipment without connecting to the mains (cold start)There is
Battery type, voltage and capacitylead-acid maintenance-free
1 × 12 V, 5 Ah
Possibility of connecting an additional batteryNo
Maximum charge currentn/a
Typical charge time4-6 hours up to 90%
Sound alarmyes (can be disabled in Parachute)
Pulse noise filteringThere is
Overload capacity in linear moden/a
Overload capacity in battery moden/a
Output connectors3 × CEE7/4 (Schuko)
Additional connectors1 × USB-A for charging mobile devices
Charger parametersn/a (according to our measurements: 5 V / up to 2.2 A)
Interface for communication with PCUSB-B
Data line protectionNo
Dimensions (W×D×H)245×164×90 mm
Net weight4.5 kg
Noise<40 dB
Working conditionshumidity 0—90% (non-condensing)
temperature 0 to +40 °C
Standard Warranty2 years
The UPS is supplied in a regular cardboard box.

The UPS is supplied in a regular cardboard box.

In addition to the source itself, the kit includes instructions in Russian and a USB-A/USB-B cable for connecting to a computer. You can download monitoring and management software yourself.Models with C13 output sockets are additionally equipped with a cable with C13/C14 connectors.

In addition to the source itself, the kit includes instructions in Russian and a USB-A/USB-B cable for connecting to a computer. You can download monitoring and management software yourself.

Models with C13 output sockets are additionally equipped with a cable with C13/C14 connectors.

Appearance and controls

The body is made entirely of matte black plastic. The absence of metal external parts and chassis has become the standard for more affordable UPSs, and sometimes even for more powerful models.

The sockets for connection are not on the back side, like most similar devices, but are located on top, essentially on the “back” of the device. This convenient solution makes it easier to access outlets whether the UPS is placed on a table or when it is installed on the floor. This configuration, although not unique, is not common.

The top panel contains low-current connectors: a USB-B port for interacting with a computer and a USB-A port for connecting a charger. These ports are easily accessible when placing the source on a table, but will require some bending when placed on the floor.

A cable for connecting to the AC mains (1.4 m long, with wear protection) comes out of one of the side walls; there is also an automatic fuse.

On the opposite wall there is a mechanical Power button with a green indicator (constantly lit when connected to the network and flashes while operating on battery power).

Ventilation holes are located on the top and side surfaces. The models in this line have passive cooling, that is, without the use of a fan.

The legs are present, but they are represented by four small annular protrusions on the bottom (this is a typical solution that is often found). This UPS does not have a battery compartment cover, but the instructions suggest contacting an authorized service center to replace the battery. However, replacing the battery is likely not too difficult and can be done on your own.

There are also shaped holes on the bottom for hanging the source on the wall.

And on one of the side walls there are supports that allow you to install the UPS vertically.

Internal organization

To open the case, you need to turn the UPS upside down and unscrew the four screws located in the holes on the bottom. After this, you need to return the UPS to its normal position and remove the top cover along with the sockets.

At the bottom there remains a transformer with a core on W-shaped plates, a battery and a board with electronic components; at the top there are power output sockets and two small boards: an interface for the USB-B port and a charger with a USB-A connector.

The inverter is made of four CS150N03 MOS transistors mounted on an aluminum radiator in the form of a small bar with fins. The radiator is located in the opposite corner from the transformer, that is, the heating elements are not concentrated in one part of the source.

As already mentioned, there is no fan in the design.

Switching is carried out by three DH3F A-12D-SF and two DH3F A-12D-SF10 relays; protection against impulse noise contains a varistor and a 1.2 μF capacitor X2, which are located under the body of an automatic fuse with a rating of 7 A.


The design of the Leoch DJW12-5.0 battery installed in our copy differs from the typical shape of an elongated bar. Here the dimensions are 111x90x70 mm, which brings the shape closer to cubic. The terminals of this battery are of a standard blade type, and its connection is made through connectors, which allows replacement without the use of a soldering iron. The voltage of this battery is 12 V and the capacity is 5 Ah.

The information indicated on the battery case as a capacity of 5 Ah refers to a 20-hour discharge, which implies a current of about 0.25 A. However, for loads close to the maximum declared for the UPS, the discharge currents are significantly higher, reaching tens of amperes (we noticed values up to 50 A). Under such conditions, the actual battery capacity is significantly reduced.

To protect the charge-discharge circuit, two 30 A fuses are used, connected in series and tinned on the board, making them not user replaceable.

The battery begins to charge immediately after connecting the UPS power cable to the outlet, even if the power source itself is not turned on by the button.

Typically, a current of about 0.1C is considered optimal for charging, where C is the declared battery capacity. In this case it is 0.5 A; The Leoch specification also specifies a maximum charge current of 1.5A. At the start of the process we recorded an intermediate current value, but this quickly decreased: we measured the charge after a shutdown while running offline with a 300W load (significant for this UPS) and subsequent recovery voltage at the source input. The measurement results made by an external device are presented in the table.

Initial current10 min.15 minutes.20 minutes.30 min.45 min.1 hour1,5 hour2.5 hours3 hours
1.1 A0.9 A0.75 A0.55 A0.4 A0.35 A0.25A0.18 A0.1 A0.07-0.08 A or less

Judging by the current, it can be assumed that it took about 2.5 hours to fully charge, which is not very much even for a battery of such a small capacity, but we must remember that the depth of discharge and, accordingly, the energy recovery time are highly dependent on the current consumed. Therefore, we made another measurement after discharge to a small load of 25 W, this time focusing on the energy consumed by the source from the AC mains.

Time, h:mm0:00 — 0:451:00 – 3:003:304:004:304:456:307:30
Power, Wthirty27221916131211.5
Power, VA32292421191615.515
Power factor (PF)0.940.930.910.880.850.790.780.76

Here, a full charge occurs in about 5.5-6 hours, and this is already too much for such a battery, although it is quite consistent with the specifications “4-6 hours up to 90%” .

The heating of the case during charging can be noticeable: at a maximum of 22-23 degrees relative to the room temperature.


As mentioned earlier, it is recommended to download the software directly from the official website.

Parachute is available in several versions: for Mac OS, Linux (graphical and text modes) and Windows, which we used for testing, the current version is v.1.04-23119.

For more complex UPS models equipped with network cards, it is recommended to use the Parachute Pro program, which is also available for download. Both programs have instructions in Russian.

The installation process of the program is not difficult. After installation is complete, a shortcut appears on the desktop, by clicking on which you can start monitoring, which is displayed as an icon in the system tray. When certain events occur, the program issues notifications with some delay.

Windows with notifications have to be closed manually, which is not very convenient if there are a lot of them.

To view the status and/or change parameters, right-click on the monitor icon and select “Open Monitor”.

The program will open in a browser window; you can select Russian for the interface.

Pay attention to the upper right corner of the window: it indicates logging in as a guest, which only provides the ability to monitor the status, but does not provide rights to change settings. To perform full work, you will need to log in as an administrator using the default password «administrator» (however, this can be changed).

The Status View page displays various parameters: charge and load levels in percentage, input voltage, output voltage and battery level, as well as frequency. All this data is presented along with an animated picture that clearly demonstrates the current state. It should be noted that the block diagram corresponds to an online UPS with bypass function and not a line-interactive UPS. It displays only two states: direct transmission of input voltage to output (Line mode) and battery operation. The operation of the automatic voltage regulation (AVR) step-down or step-up stages is not shown in this block diagram.

Input voltage is low, but AVR boost stage operation is not indicated

Input voltage is low, but AVR boost stage operation is not indicated

Battery operation is shown in the diagram and inscription in the “UPS mode” column

Battery operation is shown in the diagram and inscription in the “UPS mode” column

You can switch to a different presentation of the same information:

Or display the changes in chart form:

The readings in the program correspond to a level sufficient for normal use; they are not precision measurements, but at the same time they fully satisfy basic needs.

In battery mode there is no estimate of the time to shutdown at the current load. However, battery life estimates are usually fairly rough, so the lack of this feature is not a significant drawback.

The program also does not display temperature indicators, however, for this type of uninterruptible power supply this is not a critical parameter.

It is important to note that the program maintains an event log with detailed records of events that occur.

Such programs are often designed for the most “advanced” UPS models that have a large number of settings, but for simpler products their functionality is redundant: many settings remain inaccessible. We see the same thing in this case: for the Systeme Electric Back-Save BVSE line, you can only turn off the sound signals.

This setting is retained even after disconnecting the power source from the computer running the program. Once the UPS is restarted, signals resume when switching to battery.

The program also provides the ability to perform a battery test either at the touch of a button or on a schedule.

Although the specification indicates nominal values of 220/230/240 volts for input and output voltages, there is no setting of these values for models in this line. Usually these values are set during production, and are sometimes indicated on a sticker on the case. The label on this unit states «220-240V», but it is unclear which of these is the nominal rating.

A simple measuring tool such as a voltmeter may not be useful here. The power supply may have tolerances of up to 10% within its rated value, meaning up to 20 volts may fluctuate up and down from the specified 220/230/240V ratings. Our measurements showed «227V» when running on battery power, which is any from the three denominations indicated above.

Under normal conditions of use this will probably not cause any problems, but during testing it is important to evaluate whether actual deviations are within acceptable limits. To do this, you need to know the nominal value.

There is also a set of standard settings for the UPS, which are not related to the input and output parameters. For example, the power supply can be turned on and off on a schedule at a set frequency — once, daily or weekly.

There is provision for load management in battery mode — turning off after a certain time or according to a specified amount of charge remaining, while you can set the execution of a file on the computer.

It is possible to send notifications about events in the form of SMS and email.


Support for the Smart Battery standard has not been announced and was not found during our reviews. Although most owners probably won't feel any regret about this, as the functionality ends up being quite limited in this regard.

The input automatic fuse with a rated power of 7 A fully corresponds to the declared power, taking into account possible inrush currents. The wire size of the input cable is 0.75 mm², which is a little annoying, but acceptable.

Some UPS models have been criticized for their “Green Mode,” which causes the source to shut down when there is little or no load. However, in this case we did not find such a problem: testing autonomous operation without load for an hour and a half did not lead to the source being turned off.

The cold start function works: supplying voltage to the connected loads in the absence of power at the UPS input is possible.

Compatibility with loads is noted, including power supplies with APFC technology. A computer with a be quiet! power supply is connected. Straight Power 10 (500 W), and no problems were found at loads from 150 to 230 W (with monitor).

The average source consumption with the button off is 9.5-10 W (13.5-14 VA, PF = 0.73), and with the button on, but without loads, a little more: about 11 W / 15 VA .

The source is able to withstand overloads: when operating in linear mode with a load power of more than 550 W, frequent sound signals begin, but the source does not turn off for at least 30 seconds.

Regarding heating issues: the source body heats up significantly, especially when charging after long-term battery operation with a low load. The temperature of some parts of the source can rise to 37-38 degrees above the environment.

The source has moderate noise during operation: the hum of the transformer in linear mode is noticeable only when your ear is pressed to the body. In standalone mode, the low-frequency hum is more audible, but measurements show about 30-30.5 dBA at a distance of half a meter, which is masked by background noise in an office space.

Relay beeps and beeps are the loudest, but can be turned off in Parachute.

Built-in charger for smartphones

When an uninterruptible power supply (UPS) is connected to an AC network, the charger (charger) begins to function regardless of the position of the Power button. Even in the absence of external power, the charger continues to work, but to activate the source you must press the Power button. Therefore, we can conditionally consider this source as a large power bank with a large supply of energy. However, it is large, heavy, and when operating in battery mode it constantly beeps (unless connected to a computer running Parachute).

The only supported fast charging mode, if it can be considered such today, is Apple2.1A.

When idling, the voltage remains stable at about 5.3 V and remains above 5 V at currents up to 2.18 A. When the current rises to 2.19-2.2 A, the voltage drops to about 4.85-4 .9 V, which is also an acceptable indicator. However, if you increase the current by another 20-30 mA, the protection begins to operate, which leads to a sharp drop in voltage, first to 4.4-4.5 V, and then even lower. When the load is reduced, the voltage is automatically and quickly restored to normal values.

Thus, for most modern smartphones, the charger built into the UPS is quite suitable. In normal modes, currents exceeding 2.2 A are not very frequent, even in the initial charging phase when consumption is usually at its maximum, consistent with the charging algorithm for lithium-ion batteries. However, you should not count on very fast charging of devices that support modern technologies such as Quick Charge or Power Delivery.

Output voltage form

The output voltage when operating on battery power is a typical “modified sine wave” for such UPSs, which has nothing in common with a real sine wave, but is quite suitable for use with devices equipped with switching power supplies.

Here's what it looks like at idle and under loads of 150 W and 200 VA (PF = 0.7). In this case, the horizontal time step (large scale) is 5 milliseconds:

No load

No load

Load 150 W

Load 150 W

Load 200 VA (PF = 0.7)

Load 200 VA (PF = 0.7)

Autonomous operation

Let's move on to testing autonomous operation with different loads. Here are the results in graph form:

More precise values ​​are given in the table.

Load, WBattery life, h:mm:ss

Overload on the bottom line indicates operation with a slight excess load, but even within the declared power, the battery life of a few seconds can hardly be considered satisfactory. Such protection can only help in case of short-term power failures. To safely shut down the operating system, you need a margin of at least a minute, preferably even two. This means that the load power should not exceed 250-300 W, which corresponds to an average office computer with an LCD monitor. If you plan to work with higher loads, you need to choose a more powerful UPS.

The frequency deviation at the outputs in stand-alone mode did not exceed ±1 Hz, which is in good agreement with the values specified in the specification.

Automatic output voltage regulation

The studies we have were carried out at a supply voltage of no more than 300 V. As a result, the behavior of the UPS at higher voltages was not studied. We present the results of operation at a load of 100 W (nominal value at 220 V).

Input voltage (when decreasing from 300 to 0 V)Output voltageOperating mode
300-274 V227 Vfrom battery
274-248 V226-207 Vfrom the network with step-down (AVR)
248—207 V248—207 Vdirectly from the network
207-169 V240-196 Vfrom the network with boost (AVR)
168 V or less227 Vfrom battery
Input voltage (rising from 0 to 300 V)Output voltageOperating mode
less than 175 V227 Vfrom battery
175—213 V205-244 Vfrom the network with boost (AVR)
213-254 V213-254 Vdirectly from the network
254-286 V213—233 Vfrom the network with step-down (AVR)
287—300 V227 Vfrom battery

To evaluate the UPS, we focus on GOST 32144-2013, which allows deviations within ±10%, which coincides with the specified limits in the specification. For example, if the nominal output voltage is 220 V, then the range is considered acceptable from 198 to 242 volts. If the rated voltage is 230 V, then the range will be from 207 to 253 volts. Based on the data presented in the table, it can be assumed that for this instance the nominal value of the output voltage is 230 V. Thus, deviations within the measurement error comply with the stated requirements of the standard.

Hysteresis, or the difference between the values for turning a mode on and off, is an important parameter. It is necessary to prevent constant transitions between modes when the input voltage fluctuates slightly around the switching value.


The specification states: “Switching time is typical 2-6 ms, max. 10 ms." But it does not specify what kind of switching we are talking about, and there are many options: from AVR to direct broadcast of the input network, from inverter to broadcast, reverse operations, and even transitions from the inverter to the step-up or step-down stages of the AVR.

Therefore, we have to assume that any transient process should last no more than 10 ms. Let's look at some options with a 100 W load. Let us remind you: one large horizontal division is 5 ms, a small one is 1 ms.

The input voltage has increased, the AVR step-down stage is turned on:

No bouncing of the relay contacts is visible; switching occurs in 2 ms.

Now the reverse transition is from upscale AVR to live broadcast:

Here the transition process lasts noticeably longer — about 8 milliseconds, and there is significant chatter.

We use the inverter in a transition situation between the AVR boost stage and the battery.

The transition took approximately 2 ms.

The opposite situation is from the battery to the boost stage of the AVR:

Here we get a little more than the stated maximum of 10 ms — about 13 ms, the chatter is significant.

Switching from AVR upstage to live broadcast:

The chatter is significant, but the transition is within 6-7 ms.

Thus, with rare exceptions, transient processes fit within the maximum declared interval.

Bottom line

The Systeme Electric Back-Save BVSE800RS uninterruptible power supply generally corresponds to the declared values ​​for all tested parameters.

Placing the outlet sockets on the top plane rather than at the back makes them easier to access, although the number of sockets may seem insufficient. However, it is fully consistent with the maximum power of the UPS. For additional devices with low consumption, you can use a cable with a block for the required number of sockets.

The built-in charger with USB-A port and battery support, although primitive by modern standards, still does not remain useless.

The absence of Green Mode expands the ability to use the source to power small loads, such as network equipment or surveillance systems.

Indication of modes is limited to a single LED in the Power button, but you can use the proposed monitoring and control program to display parameters. It allows you to track almost all the necessary data.

The presence of several models in the line gives potential buyers the opportunity to choose a UPS in accordance with their load power needs without overpaying.