PREMIER EVACS 1-16 INSTRUCTION MANUAL: 2-ZONE NETWORKED VOICE ALARM PANEL
Document no: GLT-237-7-1
PAGE 28
Issue: 1.5
Date: 02/04/2014
Battery calculation
As a general rule the battery selected as a backup power source for the panel should be calculated to provide at
least 24 hours of standby power, plus 30 minutes power in the alarm condition plus a 25% reserve to account for
battery life degradation, environmental factors or unexpected power drains.
When calculating the backup power requirements for the audio system it is important to note that the relationship
between output power, volume and power drain is non-linear, and may differ depending on the message store used.
The following graph shows the typical current drawn by a single audio channel based on the output power
Standby current
will consist of the quiescent current draw of the panel, plus the current draw of any equipment
connected to the aux power output.
Alarm current
will consist of: the alarm current of the panel
plus
the current draw of any equipment
plus
the current
draw by the audio amplifiers
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
10
20
30
40
50
C
u
rr
e
n
t
D
ra
w
(
A
)
Output power (W)
Single channel current draw
1KHz continuous sine wave
