15. Select a battery with a capacity rating equal or greater than the minimum required amp hour capacity
determined from this calculation.
Amp Hour Rating
Complete the worksheet below to tabulate the total current load and to determine the minimum required amp
hour rating of the standby batteries. Select a corresponding standby battery based on these calculations:
Category Instruction
Standby
Current
Alarm
Current
1 Power Supply Standby Current Current of the power supply with AC input failure. 80 mA
2 Fire Control Panel Standby Current Current of the fire control panel with AC input failure. Amps
3 Panel Module Standby Current
Current from panel modules in slots C through F with Standby and AC
input failure.
Amps
4 External Device Standby Current
Current of SLC, NAC, and auxiliary devices with Standby and AC input
failure.
Amps
5 Total Standby Current Total all standby currents. Amps
6 Power Supply Alarm Current Current of the power supply with Alarm and AC input failure. 80 mA
7 Fire Control Panel Alarm Current Current of the fire control panel with Alarm and AC input failure.
Amps
8 Panel Module Alarm Current
Current from panel modules in slots C through F with Alarm and AC
input failure.
Amps
9 External Device Alarm Current
Current of SLC, NAC, and auxiliary devices with Alarm and AC input
failure.
Amps
10 Total Alarm Current Total allalarm currents. Amps
11 Standby Amp Hours
Multiply total standby current with 24, 48, or 72 hours to provide the
result in amp hours.
Amp Hours
12 Alarm Amp hours
Multiply total alarm current with 5 or 15 minutes to provide the result in
Amp hours:
5 minutes = .0833 hours
15 minutes = .25 hours
Amp Hours
13 Sum Standby and Alarm Amp Hours Combine the sum of amp hours for total standby and alarm.
Amp Hours
14 Standby Battery Amp Hour Capacity Multiply the combined amp hours with the de-rating factor of 1.2
Amp Hours
SHIELD Fire, Safety & Security Ltd
Aura Fire Alarm Control Panel Installation Manual
Version 1.00 |June 2019 |MAN-1431VS
Page 145
Appendix C: Calculations
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