INFINITY ID2 INSTALLATION MANUAL.
Software Versions: PANEL 1.N & LOOP O.N
Approved Document No: GLT-211-7-1
Issue 1.9 Author: MG/NJ Date: 06/04/2016
PAGE 41
20.3 Example battery calculation
A system comprises of a 4 zone Infinity ID2 panel, with 10 sounder-flasher bases, 1 call point, 1 Wall sounder
flasher (xtratone), and one I/O per zone and the required standby is 24 hours. It will need to operate in alarm for
½ hour.
Calculate the battery size required.
T
ALM
= 0.5 Hr
T
SBY
= 24 Hr
I
QP
= 0.050A (Quiescent current for panel)
I
QD
= 4 x ((10x0.9)+0.6+0.65+1.0)/1000= 4 x 11.25/1000 =0.045 A
I
AP
= 0.102A
I
AD
= 4 x ((10x7.2)+2.5+7.3+2.0)/1000 = 4 x 83.8/1000 = 0.3352 A
Therefore using the equation:
Battery Size (Standby time in Amp Hours) = 1.25 x [(Df x T
ALM
x (I
AP
+I
AD
) )+ (T
SBY
x (I
QP
+ I
QD
))]
Battery Size (Standby time in Amp Hours) = 1.25 x [(2 x 0.5 x (0.102+0.3352)) + (24 x (0.050 + 0.045))]
Battery Size (Standby time in Amp Hours) = 1.25 x [0.4372 + 2.28]
Battery Size (Standby time in Amp Hours) = 1.25 x 2.7172
Battery Size (Standby time in Amp Hours) = 3.3965 Amp Hours
This system would require a minimum of 3.3965 Ah batteries, so we would recommend using 3.4Ah batteries (as
the enclosure is designed for this size battery).
