Edwards Signaling 2400 Series - Manual (Page 52)

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Battery Calculation Example #3
A panel with two (2) Two Zone Initiating Device Circuit Modules requires 24 hours standby, 5 minutes
alarm. The Indicating Appliance Circuit requires 2.5 Amps. The remote trouble unit to be installed with the
panel requires 15 mA in the Supervisory mode and 15 mA in the Alarm mode. Calculate the minimum
required battery capacity that will meet these requirements.
Description Quantity Supervisory
(mA)
Total Supervisory
(mA)
Alarm Total
Alarm
Base Panel 1 x 55 55 100 100
2 Zone input module 2 x 16 32 45 90
Relay Modules x 16 76
Style D IDC Converter 0 0 40
Dialer x 12 25
Annunciator Master x 10 100
Remote Trouble Unit 1 x 10 10 10 10
Auxiliary Power (mA)
Number of Detectors
60 0.050 3.0 3.0
Signal Load (mA) 2,500
TOTAL 105 (A) 2,703
(B)
Battery Calculation
Supervisory Hours
24 (C)
Alarm Minutes 5 (D)
Enter the data in the formula and solve the equation.
Battery Capacity (A.H.) =
( . ) + ( . ) 111 0 033
1000
Ч Ч Ч Ч
=
105 24 2,703 5
3.24 A. H.
NOTE: Battery capacity of panel can be extended to 10 AH using the 2400-BATBOX Battery Cabinet.
Two 12V, 6.5 AH batteries (P/N 12V6A5) will adequately power this system. Note that this is the same
sample problem as Example #2. In this case, however, the answer provided by using the worksheets is
only slightly lower than the answer provided by using the tables.