EXPro Installation Manual
Approved Document No: GLT-212-7-1
Page 27
Issue: 1.7 Author: MF/NRPJ Date: 05/07/2021
EXAMPLE BATTERY SIZE CALCULATION
Consider a system consisting of:
4x 1
st
stage alarm Maxitone sounders
4x 2
nd
stage alarm Maxitone sounders
The system requires a 48hour standby time
The first stage alarm sounds for a minimum of 30 minutes
The bottle output activates 1A for 5 minutes
I
SBY
= 57mA
= 0.057A
T
SBY
= 48h
I
ALM
= Premier EXPro Alm + 8x Maxitone S 1 detector in alarm
= 110mA + (8 x 25mA) + 40mA
= 0.110A + 0.2A + 0.04A
= 0.35A
T
ALM
= 0.5h
I
BOT
=
1A
T
BOT
= 0.084h (5 minutes)
Battery size
= 1.25 x [(I
Q
x T
Q
) + (I
ALM
x T
ALM
) + (I
BOT
x T
BOT
)]
= 1.25 x [(0.057 x 48) + (0.35 x 0.5) + (0.084 x 1)]
= 1.25 x [2.736 + 0.175 + 0.042]
= 1.25 x 2.953
= 3.69Ah
7.2Ah batteries would be suitable for this installation