PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Document no: GLT-237-7-1
PAGE 29
Issue: 1.5
Date: 02/04/2014
Consider a system consisting of:
1x 12W speaker system
1x 8W speaker system
100mA equipment draw on Aux power
300mA equipment draw on Aux power during alarm
480mA sounder channel 1
360mA sounder channel 2
-
The system must remain on standby for 24 hours
-
The system must also be able to handle the alarm condition for a minimum of 1 hour
Referring to the audio output power graph –
The 12W speaker system will have a maximum current draw of about 1.4A
The 8W speaker system will have a maximum current draw of about 1.1A
Standby requirements
Quiescent current
0.06A
Auxiliary equipment
0.1A
Total standby current
0.16A
x standby time of:
24h
=
3.84 Ah
(1)
Alarm requirements
System current
0.5 A
Auxiliary equipment
0.3 A
Sounder circuit 1
0.48 A
Sounder circuit 2
0.36 A
Audio channel 1
1.4 A
Audio channel 2
1.1 A
Total Alarm current
4.14 A
x alarm time of:
1 h
=
4.14 Ah
(2)
Total capacity requirements
Sum of
(1)
and
(2)
=
(1)
3.84 Ah
+
(2)
4.14 Ah
=
7.98 Ah
(3)
Minimum battery capacity
=
(3)
7.98 Ah
x 1.25
=
9.975 Ah
The next battery capacity upwards from this is 12Ah, which would be suitable for this installation.
