EXPro Installation Manual
Approved Document No: GLT-212-7-1
Page 26
Issue: 1.7 Author: MF/NRPJ Date: 05/07/2021
BATTERY CALCULATION
DEVICE CURRENT CONSUMPTION
EXPRO PANEL IN VARIOUS STATES
State
Current Consumption
Mains fail, Buzzer silenced
52mA
Mains fail, Buzzer active
57mA
Mains failed, 1
st
Stage Alarm
110mA
Mains failed, 2
nd
Stage Alarm
150mA
Bottle released, Gas fired
167mA
EXPANSION BOARDS
Option
Current Consumption
For each activated relay
12mA
3-relay expansion board (Standard)
40mA Max
8-relay expansion board (Optional)
100mA Max
EXTERNAL DEVICES
Item
Quiescent
Alarm
Optical
100uA
35mA
Heat
50uA
35mA
Maxitone Sounder
0mA
25mA
DETERMINING BATTERY SIZE
To calculate the required battery backup capacity, we use the equation:-
Minimum battery Size = 1.25 x [(T
ALM
x I
ALM
) + (T
SBY
x I
SBY
) + (T
BOT
x I
BOT
)]
Where:
T
ALM
= Minimum time in hours required for the alarm [½ hour is most common time]
I
ALM
= Total alarm current in amps for all 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
SBY
= Quiescent current in amps of control panel in fault condition [because of mains
failure].
T
BOT
= Minimum time in hours required for the bottle output
I
BOT
=
Total current drawn by equipment connected to the bottle output
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