GST102A/GST104A/GST108A/GST116A
Conventional Fire Alarm Control Panel
Installation and Operation Manual
Page
32
Chapter 5 Calculation of Batteries Capacity
The formula for calculating batteries capacity is as follows:
Batteries Capacity
（
Ah
）
=
(I
Qmax
+ I
Qout
)
×
T
1
+(I
Qmin
+I
Lmax
+I
Fout
)
×
T
2
In which,
I
Qmax
is the maximum standby current of the FACP in full load, which is 0.12A (calculated based on
16 zones).
I
Qout
is the auxiliary output current in standby condition, which is 0.02A
I
Qmin
is the FACP circuit consumption in fire condition, which is 0.1A.
I
Lmax
is the loop maximum current allowed for 16 detection zones, which is 0.4A.
I
Fout
is the output current in alarm condition, which is 2A (1.9A for 3 sounder outputs and 1 fire alarm
output, and 0.5A for the auxiliary output).
T1 is the time for the batteries to work in monitoring status which shall be 24 hours by EN 54-4
standard.
T2 is the time for the batteries to work in alarm status which shall be 30 minutes by EN 54-4
standard.
From the above, we can get the maximum battery capacity is 4.56AH, so that we recommended a
7AH battery to be used for the system. And as the above calculations are based on the 16-zone
GST116A, they are also applicable to GST102A, GST104A and GST108A.
Summary of Contents for GST102A
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