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45
Figure 35 Battery time screen (15-minute discharge)
The screen also displays alarm messages (Battery Discharging, Low Battery Warning and Battery
Shutdown) and a set of five parameters that inform the operator of battery condition and time
remaining. The five parameters describing battery resources are:
• Rated Total Time, in hours and minutes, is the amount of battery backup time that should be
available under full rated load, based on system design.
• Rated Time Remaining is the Rated Total Time less the duration of the present discharge
event.
• Calculated Total Time is an estimate of the total battery backup time available, based on the
initial battery condition and actual performance while powering the connected load during the
discharge event.
• Calculated Time Remaining is a real-time estimation of battery time remaining—with the
actual connected load—before battery voltage drops to the Battery Shutdown setpoint.
• Battery Charge is the approximate percentage of total designed ampere hours of battery capac-
ity presently available based on recharge/discharge activity.
Values for Calculated Total Time and Calculated Time Remaining will appear on the screen approxi-
mately two minutes after the beginning of the discharge event. Calculated Time Remaining also
appears on the Present Status Report screen. Both Calculated Total Time and Calculated Time
Remaining will be updated every six seconds, reflecting actual load changes and battery condition.
When the Calculated Times become available, they will be displayed in place of the Battery Discharg-
ing message on this screen.
Figure 36 Battery time screen (45-minute discharge)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Time (Minutes)
340
360
380
400
420
440
460
480
500
VDC
Battery Shutdown = 384
Rated Time (Hrs:Min)
Total 00:10 Remain 0:00
Battery Charge = 5%
SELECT : MASTER MENU
Low Battery Warning
Calculated Time (Hrs:Min)
Total 00:15 Remain 0:01
0 102030405060
Time (Minutes)
340
360
380
400
420
440
460
480
500
VDC
Battery Shutdown = 417
Battery Charge = 3%
Total 00:45 Remain 0:01
Rated Time (Hrs:Min)
Total 00:25 Remain 0:00
SELECT : MASTER MENU
Low Battery Warning
Calculated Time (Hrs:Min)