12
FFT-1000 INSTALLATION MANUAL-5409205-REV A 4/21
Appendix A: Battery Calculation Worksheets
Description
Quantity
Standby
(mA)
Total
Standby
(mA)
Alarm
(mA)
Total
Alarm
(mA)
FFT-1000
1
146 mA
146 mA
255 mA
255 mA
FSB-8
1
4 mA
4 mA
13 mA
13 mA
FSB-24
1
4 mA
27 mA
FFT-EXP
56 mA
166 mA
Total (mA)
Total (ma)
Convert to Amps
x 0.001
Convert to Amps
x 0.001
(*Refer to maximum allowable standby current) Total A:
Total A:
Multiply by standby hours
x____
60 minutes per hour
Alarm time (minutes)
Example
:
5 minute alarm: enter 12
10 minute alarm: enter 6
÷ ____
Total Standby AH
Total Alarm AH
+Total Standby AH
Total AH
Efficiency Factor
÷ 0.80
Required AH
*Maximum Allowable Standby Current
(UL 24-Hour standby time)
7 AH
.215 A
18 AH
.582 A
33 AH
1.082 A
55 AH
1.815 A
Important Notes:
1) FACP enclosure can house up to two (2) 18 AH batteries. Larger batteries require accessory
enclosure, part #SSU00500.
2) NFPA 72 requires 24 hours of standby power followed by 5 minutes alarm activation.
3) Door holder circuits configured to disconnect upon AC loss need not be included in the battery
standby calculation since they will not draw power during that time. Door holders will contribute to
standby current draw when AC is present.
4) Total current must not exceed power supply rating (5.0A).
5) LED/Relay/IDC-6 current must be accounted for in the battery calculation for the supplying source.
