Edwards Signaling 2400 Series User Manual
Page 50
42
Battery Calculation Example #2
A two zone panel with two (2) option modules requires 24 hours of standby, 5 minutes of alarm. The IAC
requires 2.5 Amps. The 4-wire smoke detectors require 25 mA of auxiliary power. Calculate the minimum
battery capacity that will meet these requirements.
Looking at Table 10.1, the intersection of the two (2) option module row and the 25 mA supervisory current
occurs at 4.5. This indicates that the required battery capacity is 4.5 AH. Two 12 V, 6.5 AH batteries (P/N
12V6A5) will adequately power this system. NOTE: If 8 zones were installed in the panel, the battery
capacity would remain at 6.5 AH.
EXAMPLE #2
Table 10.1 - 24 Hours Supervisory, 5 Minutes of Alarm
Signal Circuit Current: 4 Amps for 5 Minutes
Panel Current Load
Aux. Power Supervisory Current (A)
0
25
50
75
100
125
150
#
Zones
#
Option
odules
Amp/Hour Battery Size
2
0
4.5
4.5
4.5
4.5
6.5
6.5
6.5
2
1
4.5
4.5
4.5
6.5
6.5
6.5
8.0*
2
2
4.5
4.5
4.5
6.5
6.5
6.5
8.0*
2
3
4.5
4.5
6.5
6.5
6.5
8.0
8.0*
4
0
4.5
4.5
4.5
6.5
6.5
6.5
8.0*
4
1
4.5
4.5
4.5
6.5
6.5
6.5
8.0*
4
2
4.5
4.5
6.5
6.5
6.5
8.0*
8.0*
8
0
4.5
4.5
6.5
6.5
6.5
8.0
8.0*
8
1
4.5
6.5
6.5
6.5
8.0
8.0
-
8
2
4.5
6.5
6.5
6.5
8.0
8.0
-
8
3
4.5
6.5
6.5
8.0
8.0
8.0
-
* = Must Purchase Auxiliary Battery Box P/N BATBOX Separately.