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APC Back UPS 400

This 400 VA model has four power outlets–a nice
touch. Otherwise, the performance of this unit is below the mark. The front panel is
simple enough with two toggle switches for on-off and testing. On the back side are four
dip switches for alarms and other settings and an RS 232 port for software regulation.


A mid-sized 400 VA offline UPS with
four power outlets, and dip switches for settings. Good performance and efficiency, but
low regulation for Indian conditions. Optional software control (not tested). Rs 11,700. Ranking:
15 (of 17 tested) Efficiency: 95% at 174 W Switchover time: 6.2 ms Backup
: 9 minutes

What really let this model down is its lack of
regulation on the higher side. Its maximum output voltage and minimum switchover voltage
were way outside limits. It was also not able to cold-start a 250 VA load, in spite of its
400 VA rating.

The Back UPS 400 registered an impressive 95 percent
efficiency, but at 174 watts.

This UPS is useful where you have a regulated mains supply,
and where you need effective software shutdown, such as with network servers. On the
whole, not optimized enough for average Indian conditions.

PCQ Bureau: