A.3: Calculating The Battery Requirements; A.3.1: Calculating The Battery Capacity - Honeywell XLS140 Installation Manual

Calculating the Battery Requirements
A.3 Calculating the Battery Requirements
A.3.1 Calculating the Battery Capacity
Use this table to determine the battery capacity needed for the system:
Current (amps)
Secondary Non-Fire Alarm Current
(from column 3 in Table A.2)
________________
APS-6R
Standby Load Current
________________
Secondary Fire Alarm Load
(from Table A.3)
________________
Sum Column for Total Secondary Amp Hours calculated
Multiply by the derating factor x 1.2 (see Note 7)
Battery Size – Total Secondary Amp Hours Required
1. NFPA 72-1999 Local, Proprietary, and Central Station systems requires 24 hours of standby power
followed by 5 minutes in alarm.
2. NFPA 72-1999 Auxiliary and Remote Station Systems require 60 hours or standby power followed by
5 minutes in alarm.
3. Batteries installed in a system powered by an automatic starting engine generator need to provide at
least 4 hours of standby power.
4. Factory Mutual requires 90 hours of standby for deluge-preaction systems.
5. Emergency voice/alarm communications systems require 2 hours of operation in the alarm condition.
Due to the sporadic nature of voice operation, however, NFPA 72-1999 permits 15 minutes of operation
at a maximum connected load to equal 2 hours of normal use.
6. If the total exceeds 25 AH, the system requires a separate XLS-LBB battery enclosure for two
BAT-12550, 55 AH batteries in a separate XLS-LBB enclosure. If the total exceeds 55 AH, the system
requires an auxiliary battery charger with sufficient amp-hour capacity; this charger must be UL-listed for
Fire-Protective Signaling. If CHG-120 battery charger is used, it requires a second XLS-LBB enclosure.
7. The following battery derating factors must be used for Canadian installations using XLS140 charger:
• For a 12 AH battery, use derating factor of 1.2
• For a 25 AH battery, use derating factor of 1.5
• For a 55 AH battery, use derating factor of 1.8
When batteries are charged by CHG-120 charger use a derating factor of 1.2 for 25 AH and 55 AH
batteries.
XLS140 Installation Manual Form Number 95-7673-3 P/N 51927:C 12/06/2005
X Time (hours)
Required Secondary Non-Fire Alarm
Standby Time (24 or 60 hours)
X ________________
Required Secondary Non-Fire Alarm
Standby Time (24 or 60 hours)
X ________________
Required Fire Alarm Standby Time:
(for 5 minutes, enter 0.084; for 15
minutes, enter 0.25)
X ________________
Table A.4 Secondary Power Standby and Fire Alarm Load
Power Supply Calculations
= AH
= _________AH
= _________AH
= _________AH
= _________AH
= _________AH
= _________AH
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