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Table A-2: Ampere-Hour Calculations
Standby Battery Current
Convert the total from Table 1
to amps and enter here
Select a battery with an equal or greater amp/hour rating than the figure obtained in Table A-2.
Batteries must be lead-acid type.
Batteries available from Fire•Lite:
• PS-1270 12-volt, 7 amp/hour (two required)
• PS-12120 12-volt, 12 amp/hour (two required)
Notes:
1)
Alarm amp-hours assumes a maximum system draw of 3 amps in alarm for 5 minutes (0.25 amp/
hour) or for 10 minutes (0.5 amp/hour).
2)
NFPA 72-1993 Central Station, Local and Proprietary Fire Alarm Systems require 24 hours of
standby.
3)
NFPA 72-1993 Auxiliary and Remote Station Fire Alarm Systems require 60 hours of standby.
4)
The battery charger in this panel will charge a maximum of 15 amp/hour of batteries within 48 hours
(7 amp/hour minimum). Batteries larger than 12 amp/hour will require a Fire•Lite BB-17F or other
UL listed battery cabinet.
28
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Standby Time
24, 60, or 90 hours
amps
X
Enter 0.25 for 5 minutes in alarm or
0.5 for 10 minutes in alarm
Add Standby and Alarm amp/hours
MS-4424 15153:F1 06/18/97
firealarmresources.com
hours
=
+
=
Standby
amp/hours
Alarm
amp/hours
Total amp/hours
needed
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