Database of UPS inverter output waveforms (updated)

APC (Schneider Electric) other

Back-UPS 900 VA (BK900I)

APC_BK900I

Very old UPS from 1995 with labeled power of 900 VA/630 W. After replacing 5 small capacitors and batteries works flawlessly. It is of course an off-line topology with modified square wave output. The amplitude is incredibly high but this UPS works with switching power supplies so after rectification and smoothing with big capacitor, a saw wave with reasonable voltage will come out. The amplitude may also be caused by lack of earth ground for the UPS.

APC_BK900I

Back-UPS CS 350 VA (BK350EI)

APC_BK350EI

Usual plastic brick with power of 350 VA/210 W, off-line. Modified square wave output. Compared to ES series these provide slightly lower power output but recharge up to twice as fast. Idle power draw is just 3 watts. With my modifications and 9Ah Panasonic accumulator, the runtime increases up to over 9 minutes under full load (with original rating under 4 minutes).

APC_BK350EI

Back-UPS CS 500 VA (BK500EI)

This is a 500VA/300W version of the Back-UPS CS. Output waveform is pretty much the same modified square wave, or “stepped approximation to a sine wave”. With 308W output it provided over 5 minutes of backup with my moddifications and Panasonic 9Ah accumulator. The idle power consumption is about 2 W but spikes to 10 W briefly every few seconds, so I would guesstimate about 3-4 W on average.

Back-UPS CS 650 VA (BK650EI)

More powerfull, 650VA/400W version of the CS line. Although the output is quite similar to that of Smart-UPS SC, it is called differently (stepped aproximatino so a sinewave). Nothing more to say we have not already covered for the weaker models. Idle power draw with 7.2Ah accumulator is about 4 W.

Back-UPS Pro 650 VA (BP650IPNP)

APC_Back-UPS_Pro

This Back-UPS Pro unit is a step towards Smart-UPS from the ordinary Back-UPS family. While it is line-interactive, it has very limited programming capabilities compared to Smart-UPS family. Even though it can manage “smart mode” of communication over serial bus, its electronics is not capable of measuring battery voltage yet. But it has very similar board to later Smart-UPS SC family which seems to be further evolution of Back-UPS Pro. The 650VA model provides 410 true watts, with 15Ah Panasonic battery and aprox. 400watt load it managed to provide over 6 minutes of operation. The output is stepped-aproximation to a sinewave only. The unit only consumes about 14 watts while idling.

APC_BP650IPNP

Back-UPS Pro 1000 VA (BP1000I)

APC_BP1000I

This unit is actually even closer to the Smart-UPS family than the 650VA version. It seems to be directly based on one of the older Smart-UPS platforms and while I am surprised, it has sine wave output. Provides 1000 VA/670 W of line-interactive power.

APC_BP1000I

Somewhat pulsed charging, but with less than 20 mV, that is basically smooth.

APC_BP1000I_aku

CyberFort 350 VA (BF350-FR)

APC_BF350-FR

The first generation of power extender cord with integrated accumulator, the CyberFort 350 VA/225 W. It has tiny transformer for its power, but a ferrite one so the waveform is obviously created from high-frequency switching. It handles rated power, at least for a little while. The output is modified square wave of course. The battery floats above ground so I was not able to measure the battery charging output easily. The idle power consumption is just under 4 watts.

APC_BF350-FR

CyberFort 500 VA (BF500-FR)

APC_BF350-FR

A 500VA/325W version of the CyberFort, pretty much the same as the 350VA. Usually provided with 5Ah high-rate accumulator. The measured idle power consumption is about 4 watts, similarly to the 350VA model.

APC_BF-500FR

CyberFort II/Back-UPS ES 550 VA (BE550-FR)

APC_BE550-FR

Second generation CyberFort II or Back-UPS ES 550 VA/330 W. Off-line unit with modified square wave output.

APC_BE550-FR

CyberFort II/Back-UPS ES 700 VA (BE700-CP)

APC_BE700-CP

Higher-power version of the BE550, requires 9Ah batteries to last at least some reasonable time with higher load. Otherwise the same off-line unit with modified square wave output like other CyberFort II units. Idle power consumption is under 7 watts.

APC_BE700-CP

Replacing the filtration capacitor with better one (in this case Chemi-Con KZE 820 μF/25 V instead of original Jamicon 330/25 PoS) on charger supply results in suppressing the ripple to basically non-existent state. Compare with BE700G-CP below.

APC_BE700-CP_aku

CyberFort II/Back-UPS ES 700 VA (BE700G-CP)

APC_BE700G-CP

Newer “eco” version capable of turning on/off some outlets in response to load from other outlets (e. g. printer with computer) or something like that. Labeled 700 VA/405 W. Requires 9Ah batteries to last at least some reasonable time with higher load. Otherwise the same off-line with modified square wave as other CyberFort II units. The idle power consumption is slightly over 7 watts, about half a watt more than the older units (as it has the extra circuitry).

APC_BE700G-CP

Charging has pulses on 50 kHz frequency as it uses standalone SMPS for this purpose.

APC_BE700G-CP_aku

Back-UPS Pro 1200 VA (BR1200G)

The “new” Back-UPS Pro is in fact a continuance of the Back-UPS RS (below). The electronics is a new Schneider design, although there are some blocks of the design which have not changed much. It largely has the same features, though there is a display now and also the “green” socket function (as also the newer Back-UPS ES family has). The no-load consumption is aprox. 9 W (it is difficult to measure as it varies and also there is great harmonic distortion). The modified square wave output has changed only a little.

 

Back-UPS RS 800 VA (BR800I)

APC_BR800I

Smaller version of the Back-UPS RS family, the 800VA/540W unit reminds of old CS plastic bricks, but it is taller as it has two accumulators inside. Its SMPS charger has quite high harmonic distortion (thus low power factor) and also that special charging waveform (see below) so getting exact no-load power draw is somewhat difficult. But the average value is around 10 W. This unit is also quite troubled with SMD electrolytic capacitors. It is line-interactive unit with interesting waveform.

APC_BR800I

Some time later I also got another unit which outputs modified square wave, this is really interesting.

APC_BR800I_1

Charging is also interesting. While measuring without batteries connected, the UPS does not like it and beeps, there is such high ripple.

APC_BR800I_aku

With battery connected, there are basically three charging patterns which repeat themselves. The first one appears for approx. half a second.

APC_BR800I_aku_1

The second one lasts longest, few seconds.

APC_BR800I_aku_2

The last one only flashes for like half a second.

APC_BR800I_aku_3

Back-UPS RS 1000 VA (BR1000I)

APC_BR1x00I

Tall plastic towers, Back-UPS RS have with active cooling and the possibility to connect external battery packs. Line-interactive with modified square wave, labeled power of 1000 VA/600 W.

APC_BR1000I

Charging is on 50 Hz with high ripple.

APC_BR1000I_aku

Back-UPS RS 1500 VA (BR1500I)

APC_BR1500I

Higher-powered version, 1500 VA/865 W. The idle power draw is oscillating about 10 watts.  The ripple on charging here is somewhat lower. Be aware that the battery -, while close to earth ground potential, actually flows over this zero potential. Grounding it results in damage to the UPS.

APC_BR1500I_aku

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