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Comparison APC Back-UPS 700VA BX700UI 700 VA vs APC Smart-UPS SC 620VA SC620I 620 VA

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APC Back-UPS 700VA BX700UI 700 VA
APC Smart-UPS SC 620VA SC620I 620 VA
APC Back-UPS 700VA BX700UI 700 VAAPC Smart-UPS SC 620VA SC620I 620 VA
from $92.90 up to $131.08
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Typesmartsmart
Form factorstandard (Tower)standard (Tower)
Full load operating time1 min5.5 min
Half load operating time9 min15.5 min
Switching to battery10 ms
Input
Input voltage1 phase (230V)1 phase (230V)
Input voltage range140-300 V160-286 V
Max. current3 А5 А
Bypass (direct connection)is absentis absent
Output
Output voltage1 phase (230V)1 phase (230V)
Peak output power700 VA620 VA
Rated output power390 W390 W
Output voltage accuracy5 %
Output waveformsimilar to a sinusoid (approximated)similar to a sinusoid (approximated)
Output frequency47-63 Hz50-60 Hz
Reserved C13/C14 connectors43
No reserve C13/C14 connectors1
Battery
Total battery capacity7.2 Ah12 Ah
Number of batteries11
Full charge time360 min350 min
Battery hot swap
Protection
Protection
overload protection
noise filtering
data line protection
sound alarm
overload protection
noise filtering
data line protection
sound alarm
Fuseauto
Surge protection273 J320 J
Control interfaces
 
USB
RS-232
 
General
Operating temperature0 – 40 °C0 – 40 °C
Noise level45 dB45 dB
Dimensions (HxWxD)200x115x257 mm168х119х375 mm
Weight6.2 kg12.27 kg
Added to E-Catalogmay 2015april 2012

Full load operating time

UPS continuous operation time from a fully charged battery when connected to a load with a power equal to the UPS output power (maximum or effective, depending on the type of load, see the relevant paragraphs for details). For a UPS designed to work with a home or office PC, a time of about 10-15 minutes is considered sufficient, this is enough to save data and complete work. To power servers, it is worth using devices with an operating time of 20 minutes or more.

Half load operating time

UPS continuous operation time from a fully charged battery when connected to a load with a power equal to half the output power of the UPS (maximum or effective, depending on the type of load, see below for details). The operating time with such a load is much longer than for a full load, and even in the simplest models it can reach 20-30 minutes.

Switching to battery

The time required to transfer the load from mains power to battery power. In standby and interactive UPSs (see Type), a short-term power failure occurs at this moment — accordingly, the shorter the time to switch to the battery, the more uniform the power supply is provided by the source during a power failure. Ideally, the switching time for the traditional 50 Hz AC frequency should be less than 5 ms (a quarter of one cycle of the sine wave). With inverter UPSs, the transfer time is, by definition, zero.

Input voltage range

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.

Max. current

The maximum current drawn by the UPS. In fact, the current reaches its maximum value only when the UPS is operating from the mains with maximum load power and a completely discharged battery. However, when calculating the load on the power grid, this parameter should be taken into account.

Peak output power

The maximum output power supplied by the UPS, in other words, the highest apparent load power allowed for this model.

This indicator is measured in volt-amperes (the general meaning of this unit is the same as that of the watt, and different names are used to separate different types of power). The total power consumption of the load, implied in this case, is the sum of two powers — active and reactive. Active power is actually effective power (it is indicated in watts in the characteristics of electrical appliances). Reactive power is the power wasted by coils and capacitors in AC devices; with numerous coils and/or capacitors, this power can be a fairly significant part of the total energy consumption. Note that for simple tasks, you can use data on effective power (it is often given for UPS — see below); but for accurate electrical calculations it is worth using the full one.

The simplest selection rule for this indicator is: the maximum output power of the UPS in volt-amperes should be at least 1.7 times higher than the total load power in watts. There are also more detailed calculation formulas that take into account the characteristics of different types of load; they can be found in special sources. As for specific values, the most modest modern UPSs give out 700 – 1000 VA, or even less — this is enough to power a PC of average performance; and in the most "heavyweight" models, th...is figure can be 8 – 10 kVA and higher.

Output voltage accuracy

This parameter characterizes the degree of difference between the AC voltage at the output of the UPS and the perfect voltage, the graph of which has the shape of a regular sinusoid. The perfect voltage is so named because it is the most uniform and creates the least unnecessary load on the connected devices. Thus, the distortion of the output voltage is one of the most important parameters that determine the quality of the power received by the load. A distortion level of 0% means that the UPS produces a perfect sine wave, up to 5% — slight sine wave distortion, up to 18% — strong distortion, from 18% to 40% — a trapezoidal signal, more than 40% — a square wave.

Output frequency

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.

Reserved C13/C14 connectors

Number of C13/C14 connectors with power reserve provided in the UPS design.

Electrical appliances connected to connectors with a reserve are insured against a power failure in the network - in this case they switch to the battery. The C13/C14 connector itself is also known as a “computer socket”; it supplies the same 230 V as a regular household network, but is not compatible with plugs for traditional sockets, because uses three flat contacts. However, there are adapters between these standards.

At a minimum, the UPS is provided with 1, 2 or 3 C13/C14 connectors for one workstation. In more advanced, so to speak office ones, the number of C13/C14 connectors may be greater - 4 ports, 6 connectors, 8 and even more
APC Back-UPS 700VA BX700UI often compared