OPTI-UPS DS160KD33 - Manual (Page 11)

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(n) Intelligent battery test: Battery is tested after every boost charge of battery
(either initiated by battery discharge or by one month has elapsed) without
stopping the rectifier to prevent the risk of output AC failure in case of battery
bad. And can inform the user the battery condition, so that the user can take
action before the capacity of the battery is needed.
(o) Huge charging power: The charge power is selectable (Lo/Me/Hi) according
to Ah of the battery, and can charge up battery of more than 8Hrs back-up time
without adding extra charger.
(p) MTBF of fans is extended: Fans will slow down under light load, so that
the life expectancy of the fans are longer than it is specified.
(q) Redundant power supply: An extra power supply is connected redundantly
to supply power of the static switch, so that, there will be AC output no matter
what happen to the UPS.
(r) Intelligent interface: One remote control panel (or one PC) can monitor up to
99 UPS, all of them can be remotely switched on or off, and when any one of
them encounters emergent condition, it will warn the user immediately. All the
UPS status, data or commands are transmitted to external modules through 4
RS-485 ports (for long distance communication under harsh environment).
(s) Emergent stop is available: In case of hazard, for example electric shock,
fire or earthquake, the UPS can be shutdown (will have no AC at the output)
either through a switch (can be added upon request) or through smoke detector
signal (can be added upon request) to prevent further injuries or destruction.