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56 Operation
Battery Rating (modules only). This setting is a battery discharge rating in kilowatts under partial load for an
extended period, typically 60 minutes. The UPS uses the two battery shutdown voltage settings and the two bat-
tery discharge ratings in computing rated and calculated time remaining during a discharge event.
NOTE
The Low Battery alarm setting is designed to be useful at full load battery discharge
rates. It is typically set for 10 volts above the 60-Minute Battery Shutdown voltage, to
provide some measure of warning under all circumstances. If the discharge period
extends past 15 minutes (i. e., the load on the UPS is less than full capacity), the
Battery Shutdown voltage setting is gradually and automatically increased to protect
the batteries from deep discharge. The Low Battery alarm setting is not automatically
increased and should not be relied upon as an accurate indicator of battery time
remaining. Instead, the operator should consult the Battery Time screen or Present
Status screen to see the calculated time remaining based on actual usage during the
discharge period.