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SIMPLICITY INSTALLATION MANUAL.
16.1 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:
= Maximum time in hours required for the alarm [½ hour is most common time]
T
ALM
= Total Alarm Current in amps for all alarm devices connected to the alarm circuits
I
ALM
= Standby time in hours for the system after mains failure [normally 24, 48 or 72 hr]
T
SBY
= Quiescent current in amps of control panel in fault condition [because of mains failure]
I
QP
= Quiescent current in amps of all detection zones. Eg Ion detector 0.00005 Amp (50 μA) ,
I
QZ
Optical Detector = 0.0001 Amp (100 μA)
Typical Example:
A system comprises of 80 Addressable Optical detectors, 30 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
= 30 x 0.010 =0.30A
Alm-snd
T
= 24 Hr
SBY
I
= 0.150A
QP
I
= 0.200A
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 (0.2+0.30)) + (24 x (0.150 + 0.048))]
Battery Size (Standby time in Amp Hours) = 1.25 x [0.25 + (24 x 0.198)]
Battery Size (Standby time in Amp Hours) = 1.25 x [0.25 + 4.752]
Battery Size (Standby time in Amp Hours) = 1.25 x 5.002
Battery Size (Standby time in Amp Hours) = 6.25 Amp Hours
This system would require a minimum of 6.25 batteries, so we would recommend using 7Ah batteries.
Approved Document No: GLT.MAN-107
Issue : 2.00
Authorised: GH
x I
ALM
x I
ALM
ALM
Date: 4/06/2007
Software:PANEL:R1107 & LOOP:R1062
) + (T
x (I
+ I
))]
ALM
SBY
QP
QZ
) + (T
x (I
+ I
))]
SBY
QP
QZ
PAGE 29
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