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A-1
Current Draw for System Components
Each component of the panel has a specified alarm and standby current rating. To calculate the current draw for the system,
add the specified standby current for each module and device to obtain an alarm and a standby current rating for your system.
Also refer to “Module Current Specifications” at the end of this appendix.
Note:
Auxiliary power from the system’s AUX 24 V taps must also be included in the calculation, unless that power is
switched off during battery standby. For example, door holders operated from 24 V need not be included if they are discon-
nected via a relay during a battery standby condition. Notification Appliance load must be included in the alarm current total.
Total Standby Current:____________
Total Alarm Current:____________
1.
Identify Standby Time (C), in hours. C = ______ (typically 4, 24, 48, or 60 hr)
2.
From previous calculations, locate total Alarm Current (B) in amperes. B = ______
3.
Identify Alarm Time (D) in minutes. D = ______ (typically 5, 10, or 15 min)
4.
Using the values in Steps 1-4, perform an Initial Battery Calculation per the following:
5.
(A x C) + (0.0167 x B x D) = _______ Ah (Ah = ampere hours)
6.
Select a battery size LARGER than the number from the Initial Battery Calculation from the following list of batteries
using the 20 Hour Rating value:
Module
Standby Current
Alarm Current
Main System Board
(5 IDCs, 30 detectors each
130 mA
160 mA + 60 mA
per zone in alarm
Expansion IDC Module
(30 detectors per IDC)
50 mA
50 mA + 60 mA
per zone in alarm
Expansion Power Supply
50 mA
60 mA
Auxiliary Relay Module
0 mA + 10 mA
per energized relay
0 mA + 10 mA
per energized relay
Class A Adapter
0 mA + 10 mA
per zone in trouble
0 mA + 10 mA
per zone in trouble
Remote LCD Annunciator
100 mA
150 mA
Remote LED Annunciator
100 mA
100 mA
City Connect Module or Relay Module
30 mA
60 mA
Appendix A. Battery Standby Calculations
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