DAA2 & DAX — P/N 53265:A1 8/24/2011 85
DAA2 Battery Calculations Battery Calculations
Table B.3 Battery Size Requirements
Load Totals Multiplied By Time Equals Secondary Amp Hour Totals
Enter total from
Column A in Table B.1.
(Standby Load)
[ ] X
Required Secondary Non-
fire Alarm Standby Time (24
or 60 hours)
[ ] = [ ]
Non-fire Alarm
Secondary Standby
Amp Hours
Enter total from
Column B in Table B.1.
(Alarm Load)
[ ] X
Required Fire Alarm Time
in Decimal Form*
[ ] = [ ]
Secondary Fire Alarm
Amp Hour Requirement
Sum column for Total Secondary Ampere Hours (AH) Calculated =
Multiply by the derating factor X 1.2 = [ ] Total Secondary Ampere
Hours Required
*Following are decimal conversions for standard numbers of minutes:
5 minutes
10 minutes
15 minutes
30 minutes
60 minutes
0.084
0.167
0.250
0.50
1.0
Standby operating times:
• NFPA 72 Local, Proprietary, Auxiliary, Remote Station, and Central Station systems require 24 hours of standby power followed
by 5 minutes in alarm.
• Some jurisdictions require 60 hours of standby power followed by 5 minutes in alarm for Auxiliary and Remote Station systems,
based on previous NFPA 72 requirements.
• 24 hours of standby/supervisory condition followed by 2 hours of alarm.
Table B.2 Secondary Power Standby and Fire Alarm Load
Battery Size Voltage Rating Required Number Model Number
7 AH 12 volts Two BAT-1270
12 AH 12 volts Two BAT-12120
26 AH 12 volts Two BAT-12260
55 AH 12 volts Two BAT-12550
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