by January 4, 1999 0 comments

The Sleek 250 VA looked exactly like its 500 VA sibling
(ranked third), with the same all-metal case, and front and back panels. The unit has a
single On/Off switch with three LEDs on the front, and two three-pin sockets on the back
plate, along with an RS-232 port and a reset switch. The only real physical difference is
that the 250VA is lighter.

Guardian
Sleek 250VA

Rather heavy for a sub-300 VA offline
UPS, but lacks heavyweight electrical performance. Two outlets, and provision for software
control (not tested). Rs 7,500. Ranking: 10 (of 17 tetsed) Efficiency: 79%
at 130 W Switchover time: 12 ms Backup time: 10 minutes

It would have been among the top three, but for its
switchover time. In all other tests, it performed above average. And in fact this is one
of the few units whose battery float voltage is within acceptable limits. Price-wise, it
gives good competition to the other 250 VA models, but lags behind higher rated models in
cost per VA.

The Sleek was able to cold-start a 250 VA load. And when
short circuited, it tripped with fault indication on, and then switched itself back on
when the mains power was restored. The efficiency of the Sleek was a low 79 percent at 130
watts.

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