PFSIFP8
Intelligent Fire Alarm Control Panel
Installation and Operation Manual
Page 47
Chapter 7 Standby Battery Calculations
Equation for calculating the battery capacity:
Battery capacity
（
Ah
）
=I
Qmax
×T
1
+(I
Qmin
+I
Lmax
+I
Fout
) ×T
2
In which:
I
Qmax
＝
1.4A, which is the quiescent current when the FACP is full-loaded;
I
Qmin
＝
0.4A, is the quiescent current when the FACP is with no load;
I
Lmax
＝
2.4A, is the maximum loop current;
I
Fout
＝
0.5A×3
＝
1.5A, which is the alarm output current (The FACP provides 3
fire alarm outputs, output current of each is 0.5A).
T
1
is the monitoring time when the FACP is full-loaded, which shall be at least
24 hours according to AS 7240.4.
T
2
is the alarm time which shall be at least 30 minutes according to AS 7240.4.
From the above equation, we can get the battery capacity is 35.75Ah, so that a 38Ah
battery is recommended.
Summary of Contents for PFSIFP8
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