Battery and Power Supply Calculations
February 2012 A-4 P/N 06-237058-001
A-2 EXAMPLE
An example is shown below which uses the worksheet provided in Table A-1 (entries shown in red):
Unit Description Qty
Unit Standby
Current
(A)
Unit Alarm
Current
(A)
Total
Standby
Current
Total Alar m
Current
ARIES NETLink Components:
MCB (with Keypad/Display) 1 0.158 0.300 0.158 0.300
PMU Board 1 0.070 0.090 0.070 0.090
Expansion Cards:
R-NAC 1 0.021 0.1325 0.021 0.1325
Relay 2 0.012 0.0796 0.024 0.160
DACT 1 0.024 0.037 0.024 0.037
ICM 1 0.042 0.042 0.042 0.042
SLC Devices:
PSD-7152 12 0.000405 0.000445 0.005 0.005
Solenoid-Based Devices:
897494-000 1 -1.500 - 1.5
897494-530 2 -1.500 - 3.0
Notification Appliances:* (enter below)
NS-24MC (w/110 cd) 30 - 0.174 - 5.22
ENTER TOTAL STANDBY CURRENT (Sum of column)=
0.344
ENTER TOTAL ALARM CURRENT (Sum of column)=
10.487
Calculations:
REFERRING TO TABLE A-2, ENTER STANDBY TIME REQUIRED (in hours) = 24 hours
REFERRING TO TABLE A-2, ENTER ALARM TIME REQUIRED (in minutes) = 5 mins.
CONVERT ALARM TIME REQUIRED TO HOURS (using formula below):
(minutes)/60 = 0.083
hours
CALCULATE TOTAL AMPERE HOURS (using formula below):
((TOTAL STANDBY CURRENT) x (STANDBY TIME REQUIRED in hours)) + ((TOTAL ALARM
CURRENT x ALARM TIME REQUIRED in hours)) = ______TOTAL AMPERE HOURS
(0.344 x 24) + (10.487 x 0.083) =
8.256 + 0.870 = 9.126
Ampere Hours
CALCULATE BATTERY CAPACITY WITH A DE-RATING FACTOR OF 20%
(using formula below):
1.2 x 9.126 AH = 10.951 AH BATTERY CAPACITY = 12-AH
Batteries
REFERRING TO TABLES A-3 AND A-4, DETERMINE NUMBER OF POWER SUPPLIES NEEDED:
NOTE: If TOTAL ALARM CURRENT > 5.4 A, then 2 or more PSUs are required.
10.487 A > 5.4 A = 2
PSUs required
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