40
6.2 BATTERY SIZE CALCULATIONS
Device
Quantity Current per device
(amps)
Standby
current
(A)
Alarm
current
(A)
Multiply This column times this column =current
1) PAD-3 Control
Unit
1 or 2
A
Aux. Pwr. always on (SW1-4 off) – 0.035A
Aux. Pwr. off @ AC fail (SW1-4 on) – 0.015A
2) PAD-3 Control
Unit
1 or 2
A
0.140 per PAD-3
Notification Appliances – refer to the device manual for ratings
Model No. Quantity Alarm current
3)
Auxiliary Devices – refer to the device manual for ratings
Model No. Quantity Standby current Alarm current
4)
5) Total amperage required (totals for line 1, 2, 3 and 4)
B,F
A A
6) Number of Standby Hours required (4, 24, or 60, per NFPA 72)
Hrs.
7) A.H. for Standby (without AC reporting delay) Multiply line 5 times line 6
8) A.H. for AC reporting delay
C
A.H.
9) Total A.H for Standby (add line 7 and line 8)
A.H.
10) Length of Alarm Operation
D
Hrs.
11) A.H for Alarm (multiply line 5 times line 10)
A.H.
12) Total Standby and Alarm A.H required (add line 9 and line 11)
A.H
13) Battery De-rating Factor 1.25
14) Battery Amp-Hour Rating required (multiply line 12 times line 13)
E
A.H.
A. Up to two PAD-3 boards can be connected to a common battery set. When calculating for 2 PAD-3 boards
I. Both boards must be mounted on System 3 rails in the same enclosure.
II. One of the boards must have the battery charger circuit disconnected.
III. The board with the ACTIVE charger is limited to 1.50 amps for the aux. power (terminals 18 and 19).
IV. Both sets of battery connections are to be connected to the same battery set using 2 battery connection splitters, P/N 230-
299203.
B. The Alarm Current must never exceed 6.14 amps! (6 amps output for NACs and aux. power, 0.14 amps for internal operation)
C. A.H. required for AC reporting delay – 0 hours = 0.00 A.H.; 60 minutes = 0.24 A.H.; 120 minutes = 0.60 A.H.; 180 minutes =
0.96 A.H.
D. Alarm operation length while on battery power varies with application and local codes. Check with the AHJ to determine if 5
minutes (0.0833 hours), 30 minutes (0.5 hours), 1 hour, or 2 hours of alarm operation is required.
E. Battery rating required cannot exceed 15 A.H. For battery ratings 7.0 A.H. or below, the full 3.0 amps are available for auxiliary
power (terminals 18 and 19). For battery ratings between 7.0 and 15 A.H., 1.50 amps are available for auxiliary power.
F. The following table shows the maximum standby current allowed: When the Auxiliary Power Output is programmed to
shutdown on AC power fault (SW1.4-ON), up to 3.015 Amps is allowed.
Maximum Standby Current (A.) Standby
Hours
7AH 10AH 15AH
4 1.242 1.842 2.842
24 0.207 0.307 0.473
60 0.082 0.122 0.189
90 0.055 0.081 0.126
To Next Page
Loading...
Need help?
General
