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PREMIER AD INSTALLATION MANUAL.
12.1 STANDBY BATTERY CALCULATION
In order to calculate the standby battery size required, the following formula can be used:-
Battery Size (Standby time in Amp Hours) = 1.25 x [(T
Where:
T
= Maximum time in hours required for the alarm [½ hour is most common time]
ALM
I
= Total Alarm Current in amps for all alarm devices connected to the alarm circuits
ALM
T
= Standby time in hours for the system after mains failure [normally 24, 48 or 72 hr]
SBY
I
= Quiescent current in amps of control panel in fault condition [because of mains failure]
QP
I
= Quiescent current in amps of all detection zones. Eg Ion detector 0.00005 Amp
QZ
(50 µA) , Optical Detector = 0.0001 Amp (100 µA)
Typical Example:
A system comprises of 80 Addressable Optical detectors, 80 Sounder bases and the required
standby is 24 hours. It will need to operate in alarm for ½ hour.
Calculate the battery size required.
T
= 0.5 Hr
ALM
I
= 80 x 0.003 =0.24A
Alm-snd
T
= 24 Hr
SBY
I
= 0.200A
QP
I
= 0.350A
AP
I
= 80 x 0.0006 =0.048A [the quiescent current for an Addressable Optical detector is 600 µA
QZ
I
=
+ I
alm
Ialm-snd
AP
Therefore using the equation:
Battery Size (Standby time in Amp Hours) = 1.25 x [(T
Battery Size (Standby time in Amp Hours) = 1.25 x [(0.5 x (0.35+0.24)) + (24 x (0.2 + 0.048))]
Battery Size (Standby time in Amp Hours) = 1.25 x [0.295 + (24 x 0.248)]
Battery Size (Standby time in Amp Hours) = 1.25 x [0.295 + 5.952]
Battery Size (Standby time in Amp Hours) = 1.25 x 6.247
Battery Size (Standby time in Amp Hours) = 7.80 Amp Hours
This system would require a minimum of 7.80 batteries, so we would recommend using 7Ah
batteries.
Note: This calculation is based on the 3mA sounder base.
Approved Document No: GLT.MAN-105
Issue : 1.02
Authorised: GH
ALM
Date: 15/03/2004
x I
) + (T
x (I
ALM
ALM
SBY
QP
x I
) + (T
x (I
+ I
ALM
SBY
QP
Software:31/3/04 & LC6
+ I
))]
QZ
))]
QZ
PAGE 24
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