PREMIER AD INSTALLATION MANUAL.
Software:PANEL:R1107 & LOOP:R1062
Approved Document No: GLT.MAN-105A
PAGE 30
Issue : 2.02 Authorised: GH Date: 16/07/2007
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
ALM
x I
ALM
) + (T
SBY
x (I
QP
+ I
QZ
))]
Where:
T
ALM
= Maximum time in hours required for the alarm [½ hour is most common time]
I
ALM
= Total Alarm Current in amps for all alarm devices connected to the alarm circuits
T
SBY
= Standby time in hours for the system after mains failure [normally 24, 48 or 72 hr]
I
QP
= Quiescent current in amps of control panel in fault condition [because of mains failure]
I
QZ
= Quiescent current in amps of all detection zones. Eg Ion detector 0.00005 Amp
(50
μ
A) , Optical Detector = 0.0001 Amp (100
μ
A)
Typical Example:
A system comprises of 160 Addressable Optical detectors, 64 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
ALM
= 0.5 Hr
I
Alm-snd
= 64 x 0.010 =0.64A
T
SBY
= 24 Hr
I
QP
= 0.200A
I
AP
= 0.250A
I
QL
= 160 x 0.0006 =0.096A [the quiescent current for an Addressable Optical detector is 600
μ
A
I
alm
=
Ialm-snd
+ I
AP +
I
QL
Therefore using the equation:
Battery Size (Standby time in Amp Hours) = 1.25 x [(T
ALM
x I
ALM
) + (T
SBY
x (I
QP
+ I
QZ
))]
Battery Size (Standby time in Amp Hours) = 1.25 x [(0.5 x (0.25+0.64+0.096)) + (24 x (0.2 + 0.096))]
Battery Size (Standby time in Amp Hours) = 1.25 x [(0.5 X 0.986) + (24 x 0.296)]
Battery Size (Standby time in Amp Hours) = 1.25 x [0.493 + 7.104]
Battery Size (Standby time in Amp Hours) = 1.25 x 7.597
Battery Size (Standby time in Amp Hours) = 9.496 Amp Hours
For a system like this, we would usually recommend 2 X 12V,12 Ah SLA Batteries.
(The case is designed to hold 7AH or 12 AH batteries. Using 7AH batteries would only give a standby
time of approximately 17 hours)
Summary of Contents for NPAD 2
Page 1: ...INSTALLATION MANUAL...
