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Section 9
Battery Calculation
9.1
Calculating Current Draw and Standby Battery
This section enables you to determine the current draw and standby battery needs for your
installation (18 Ampere Hours maximum).
Batteries larger than 18 AH will not fit into the main control cabinet, and must be housed in
the RBB Accessory Battery Cabinet. See Section 3.8.2 for battery installation.
Lines A through D have been completed for you. Complete the remaining instructions in
Table 9-1 to determine battery size requirements.
Device
Main Control Panel
SKE-ZN4
SKE-ZN6
SKE-SRM
SKE-V70
A
Current Subtotals:
Notification Devices
Full Load (50 watts)*
B
Current Subtotals:
C
Total current rating of all devices in system (add TOTALS OF A-C) X .001:
D
Number of standby hours. (24 or 60 for NFPA 72, chapter 1, 1-5.2.5):
E
Multiply lines C (standby current) and D:
F
Alarm sounding period in hours. (For example, 5 minutes = .0833 hours)
G
Multiply lines C (alarm current) and F:
H
Add lines E and G. (AH = Ampere Hours)
* If less than 50 watts are used, calculate 45 mA per watt.
151267
Table 9-1: Current Draw Calculations
Number of
Current per Device
Devices
Standby:
1
Alarm:
Standby:
1
Alarm: All Channels 250 mA
Standby:
1
Alarm: All Channels 120 mA
Standby:
1
Alarm:
Standby:
1
Alarm:
Refer to device manual for number of devices and current ratings.
Alarm:
firealarmresources.com
Standby
Current
140 mA
140 mA
590 mA
45 mA
mA
35 mA
mA
30 mA
mA
30 mA
10 mA
mA
70 mA
mA
2250 mA
mA
Total standby AH
AH
Total alarm AH
Total AH required
AH
Alarm
Current
590 mA
mA
mA
mA
mA
mA
mA
mA
A
A
H
H
AH
9-1
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