Chapter 6: Battery Calculations; Battery Calculations - Fire-Lite 411UDAC Installation, Programming, Troubleshooting And Operating Instruction Manual

Fire alarm communicator
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Battery Calculations

CHAPTER 6
Use the Total Standby and Alarm Load Currents calculated in Table 6-2, "Load in Standby," on page 66, and Table 6-
3, "Load in Alarm," on page 66, for the following battery calculations.
Battery Calculations
TABLE 6-1:
Standby Load
Current in amps
X
(from Table 6-2 )
[
]
Alarm Load
Current in amps
X
(from Table 6-3 )
[
]
Add Standby and Alarm Load for Required Ampere Hour Battery
Multiplying by derating factor of 1.2
Total Ampere Hour Battery
Select a battery with an Amp Hour rating greater than that calculated in Table 6-1 .
1.
NFPA 72 for Central Station and Proprietary Protected Premises systems require 24 hours of standby
NFPA 72 for Auxiliary and Remote Station systems require 60 hours of standby (14 Amp Hours)
Two 12 VDC, 7 Amp Hour batteries, wired in parallel, can be located in the backbox to provide 14 Amp
2.
Hours of backup (refer to Figure 2-5 on page 22 for battery cable connections)
Battery Calculations
Required Standby Time in Hours
(24 or 60 Hours)
[
]
Required Alarm Time in Hours
(i.e. 5 min. = 0.084 Hours)
[
]
1
411UDAC
Document #51073
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Rev. D 12/09/2008
P/N 51073:D
X1.2
65

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