Comparison Marsriva MR-UF1500P-H 1500 VA vs SVC VP-1500-LCD 1500 VA

In this case, the input voltage range is implied, in which the UPS is able to supply a stable voltage to the load only due to its own regulators, without switching to the battery. For redundant UPSs (see "Type") this range is quite small, approximately 190 to 260 V; for interactive and especially inverter ones, it is much wider. Some UPS models allow you to manually set the input voltage range.

The operating frequency of the alternating current supplied to the input of the UPS — or more precisely, the frequency range of this current in which the device can supply the required power to the load due to its own regulators, without using a battery. When this range is exceeded, the UPS switches to battery mode. The smallest input voltage range is reserved for standby UPSs (see "Type"), the largest for inverter UPSs.

Bypass(by-pass) means such a mode of operation of the UPS, in which power is supplied to the load directly from an external source — the mains, diesel generator, etc. — practically without processing in the UPS itself. This mode can be activated either automatically or manually.

— The automatic bypass is a kind of safety measure. It turns on when the UPS in normal mode cannot supply power to the load — for example, when the UPS is overloaded due to a sharp increase in the power consumption of the load.

— Manual bypass allows you to enable this mode at the request of the user, regardless of the operating parameters. This may be necessary, for example, to hot-swap a battery (see below for details) or to start equipment that has a starting capacity greater than that of the UPS. Technically, it can also play the role of a security measure, but automatic systems are more reliable in this sense.

Some UPSs provide both options for enabling the bypass.

The effective output power of the UPS is, in fact, the maximum active power of the load that can be connected to the device.

Active power is consumed directly for the operation of the device; it is expressed in watts. In addition to it, most AC devices also consume reactive power, which is "wasted" (relatively speaking) is spent by coils and capacitors. Apparent power (denoted in volt-amperes) is precisely the sum of active and reactive power; it is this characteristic that should be used in accurate electrical calculations. See "Maximum output power" for details; here we note that when selecting a UPS for a relatively simple application, it is quite possible to use only effective power. This is at least easier than converting the watts claimed in the characteristics of the connected devices into full power volt-amps.

The most modest modern "uninterruptibles" give out less than 500 watts. 501 – 1000 W can be considered an average value, 1.1 – 2 kW is above average, and in the most powerful models this figure exceeds 2 kW and can reach very impressive values (up to 1000 kW or more in some industrial class UPS).

The ability to change the output voltage of the UPS at the request of the user. Electrical networks in different countries have different voltages: for example, in the post-Soviet space, the standard is 230 V, in European countries — 230 V. Small differences in appearance may not play a significant role, however, voltage mismatch can adversely affect the efficiency and durability of electrical appliances. Voltage regulation allows you to choose the optimal value, thus providing the best conditions for the operation of electronics.

The frequency (frequency range) of the AC voltage output by the UPS. For computer technology, the frequency range of 47-53 Hz is considered normal, although the smaller the deviation from the 50 Hz standard, the better. On the other hand, in some UPS models, this frequency can be automatically synchronized with the frequency of the mains — so the power supplied to the load will not differ regardless of whether the load is powered by the mains or from the battery. In this case, a wider frequency range, on the contrary, is more desirable.

The number of outlets connected to the power reserve(battery) provided in the design of the UPS. In order for the UPS to fulfill its main role (providing a backup power in case of power outages), the corresponding electrical appliances must be connected to these outlets. The sockets have a standard shape and are compatible with the vast majority of popular 230 V plugs.

At a minimum, the UPS has 1 or 2 outlets and, in more advanced ones, there may be 3 or more.

The number of C13 / C14 connectors without connection to the power reserve, provided in the design of the UPS.

Unlike connectors with a reserve, such connectors do not protect against loss of voltage in the network — for devices connected to them, the UPS only works as a surge protector, smoothing out power surges. This allows you to connect to the UPS devices that do not require continuous power and are not afraid of shutdowns, such as speakers or printers. In the event of a power failure, such devices will not consume battery power, and the UPS will be able to power devices for which continuous power, on the contrary, is essential for longer.

The C13/C14 connector is known colloquially as a "computer socket"; it delivers the same 230 V as a regular household outlet, but is not compatible with conventional plugs, as uses three flat contacts. However, there are adapters between these standards.

The absence of a battery in the UPS package — in order to use such a device for its main purpose, the battery will have to be purchased separately. This is associated with additional hassle, but gives such an important advantage as the ability to independently choose the capacity and number of batteries, without relying on the choice of the manufacturer and without the risk of overpaying for the wrong option.

Note that only models that do not have internal batteries and are designed to use external batteries can be supplied in this configuration (see below). These can be both professional inverter models (see "Type"), and inexpensive backup ones.