2: Maximum Battery Standby Load; 3: Current Draw Worksheet - Honeywell SILENT KNIGHT 5496 Manual

Prerequisites for Installation
2.4.2 Maximum Battery Standby Load
Table 2.1 shows the maximum battery standby load for the 5496 based on 24 and 60 hours of standby. The numbers below have a built in
20% derating factor for the battery amp-hour capacity. The standby load calculations of line J in the Current Draw Calculation Worksheet
(Table 2.2) must be less than the number shown in Table 2.1 for the battery size used and standby hours required.
* Max battery size for FM (Factory Mutual) installations is 33AH.
† Required for NFPA 72 Auxiliary Protected Fire Alarm systems for Fire Alarm Service (City Box) and Remote Station
Protected Fire Alarm systems (Polarity Reversal) and Digital Alarm Communicator/Transmitter (DACT).
2.4.3 Current Draw Worksheet
For each 5496 in the installation, use this worksheet to determine current requirements during alarm/battery standby operation. (Copy this
page if additional space is required.
For each device use this formula:
5496 Intelligent Power Module
(Current draw from battery)
A
Auxiliary Devices
B
Notification appliances
C
D Total current ratings of all devices in system (line A + line B + line C)
E Total current ratings converted to amperes (line D x 0.001):
F Number of standby hours (24 or 60 for NFPA 72, Chapter 1, 1-5.2.5).
G Multiply lines E and F.
H Alarm sounding period in hours. (For example, 5 minutes = 0.0833 hours.)
I Multiply lines E and H.
J Add lines G and I.
8
Rechargeable
*
Battery Size
7 AH
12 AH
18 AH
35 AH
Table 2.1 Maximum Battery Standby Load
Number of
Device
This column
1
Refer to device manual for current ratings.
Refer to device manual for current ratings.
Table 2.2 Current Draw Calculation Worksheet
Figure 2.1 Wire Routing Example
Max. Load for 24 hrs. Standby,
5 mins. Alarm
270 mA
475 mA
685 mA
1370 mA
Current per Device
Devices
X This column
Standby:
Alarm:
Alarm/Standby
Alarm/Standby
Alarm/Standby
Alarm/Standby
Auxiliary Devices Current
Alarm:
Alarm:
Alarm:
Alarm:
Notification Appliances Current
Total standby AH
Total standby and alarm AH
5496 Intelligent Power Module Manual — P/N 151276-L8:F2 2/15/2022
Calculating Current Draw and Standby Battery
Max. Load for 60 hrs. Standby
5 mins. Alarm
105 mA
190 mA
270 mA
540 mA
Standby
Current
= Current per number of devices.
40 mA 40 mA
160 mA
40 mA
5496 Current
mA
mA
mA
mA
mA 0 mA
mA 0 mA
mA 0 mA
mA 0 mA
0 mA
Total alarm AH
†
,
Alarm Current
160 mA
160 mA
mA mA
mA mA
mA mA
mA mA
mA mA
mA
mA
mA
mA
mA
mA mA
A A
H
AH
H
AH
AH