DAA2 & DAX — P/N 53265:A1 8/24/2011 87
DAX Battery Calculations Battery Calculations
Table B.5 Secondary Power Standby and Fire Alarm Load
Table B.6 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.
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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