1. Manuals
  2. Brands
  3. Zeta Manuals
  4. Fire Alarms
  5. NPAD 2
  6. Installation manual

Standby Battery Calculation - Zeta NPAD 2 Installation Manual

Analogue addressable fire alarm control panel
Hide thumbs Also See for NPAD 2:
Table of Contents

Advertisement

PREMIER AD 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
I
QZ
(50 μA) , Optical Detector = 0.0001 Amp (100 μA)
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
= 0.5 Hr
ALM
I
= 64 x 0.010 =0.64A
Alm-snd
T
= 24 Hr
SBY
I
= 0.200A
QP
I
= 0.250A
AP
I
= 160 x 0.0006 =0.096A [the quiescent current for an Addressable Optical detector is 600 μA
QL
I
=
+ I
I
alm
Ialm-snd
AP +
QL
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 (0.25+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)
Approved Document No: GLT.MAN-105A
Issue : 2.02
Authorised: GH
ALM
Date: 16/07/2007
Software:PANEL:R1107 & LOOP:R1062
x I
) + (T
x (I
ALM
ALM
SBY
QP
x I
) + (T
x (I
+ I
ALM
SBY
QP
+ I
))]
QZ
))]
QZ
PAGE 30
Show Quick Links

Hide quick links:

Advertisement

Table of Contents
loading

Related Manuals for Zeta NPAD 2

Related Content for Zeta NPAD 2

This manual is also suitable for:

Premier ad

Table of Contents