Selecting and Locating Batteries Power Supply Calculations
AFP-200 PN 15511:H2 10/14/2002 131
the cabinet door.
Table 48 Total Secondary Power Requirements at 24 VDC
A.6 Selecting and Locating Batteries
Select batteries that meet or exceed the total ampere hours calculated (Table 47 on
pages 129-130). The control panel can charge batteries in the 7 AH to 18 AH range.
Table 49 contains information, such as the battery size and location, for the batteries
required to power the control panel if an AC power loss occurs.
Note: 15 AH to 18 AH batteries require the BB-17 or other UL-listed external
battery cabinet.
Table 49 Battery Size and Location
A.7 NFPA Battery Requirements
• NFPA 72 Local and NFPA 72 Remote Station Fire Alarm Systems require 24 hours
of standby power followed by 5 minutes in alarm.
• NFPA 72 Central Station, NFPA 72 Auxiliary, and NFPA 72 Remote Station
require 60 hours of standby power followed by 5 minutes in alarm. Batteries
installed in a system powered by a generator need to provide at least 4 hours of
standby power. If sizing battery for 4 hour standby use a derating factor of 1.5
• NFPA 12, 12A, 12B require 24 hours plus 5 minutes activation. The total ampere
hours required cannot exceed 18 AH with an internal charger.
Secondary Standby Load (total
from Table 47 Calculation
Column 3)
[ ]
Required Standby Time
(24 or 60 hours)
x [ ] = AH
Primary Alarm Load (total from
Table 47 Calculation Column 2)
[ ]
Required Alarm Time
(For 5 min., enter 0.084,
for 10 min., enter 0.168)
x [ ] = AH
AVPS-24/APS-6R Alarm Load
(if using AVPS-24, enter 3.0 A, if
using APS-6R enter 6.0 A)
[ ]
Required Alarm Time
(For 5 min., enter 0.084,
for 10 min., enter 0.168)
x [ ] = AH
Sum of Standby and Alarm Ampere Hours = AH
Multiply by the Derating Factor x 1.2
Battery Size, Total Ampere Hours Required = AH
Battery
Size
Voltage
Rating
Number
Required
Part Number Location
7 AH *
12 AH
12 volts
12 volts
two
two
PS-1270
PS-12120
In control panel
backbox
18 AH 12 volts two PS-12180 BB-17 Battery Box
* Maximum alarm load on 7 AH battery is 2.5 Amps
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