15465 Rev F 5/2/97 P/N 15465:F
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Appendix A: Power Calculations
Use the Total Standby and Alarm Load Currents calculated in Tables A-1 and A-2 for the following battery
calculation.
Standby Load Current
(Amps)
[ ]
X
Required Standby Time in Hours (24 or 60
Hours)
[ ]
=
___________
Alarm Load Current (Amps)
[ ]
X
Required Alarm Time in Hours (i.e. 5 min. =
0.084 hours)
[ ]
=
___________
Add Standby and Alarm Load for Required Ampere Hour Battery
=
___________
Multiply by the Derating Factor of 1.2
=
___________
Total Ampere Hours (AH) Required
=
___________
Select a battery with a greater amp/hour rating.
Notes:
* NFPA 72-1993 Central Station, Local and Proprietary Protected Premises systems require 24 hours of standby.
* NFPA 72-1993 Auxiliary and Remote Station systems require 60 hours of standby.
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