AL1042ULADA / R1042ULADA Installation Guide
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Battery Calculation Worksheet
Device
Number of
Devices
Current per Device
Stand-by
Current
Alarm
Current
For each device use this formula: This column x This column = Equals
Current per number of devices.
AL1042ULADA/R1042ULADA
(Current draw from battery)
1
Stand-by:
130mA
130mA
Alarm:
300mA
300mA
A
AL1042/R1042 Current
130mA
300mA
Auxiliary Devices
Refer to device manual for current ratings.
Alarm/Stand-by
mA
mA
mA
Alarm/Stand-by
mA
mA
mA
Alarm/Stand-by
mA
mA
mA
B
Auxiliary Devices Current (must not exceed 1A)
Refer to device manual for current ratings.
Alarm:
mA 0mA
mA
Alarm:
mA 0mA
mA
Alarm:
mA 0mA
mA
Alarm:
mA 0mA
mA
C
Notification Appliances Current
must
not exceed 10A (10,000mA)
0mA
mA
D
Total alarm current
mA
mA
E
Total current ratings converted to amperes (line D x .001)
A
A
F
Number of standby hours (24 for NFPA 72, Chapter 1, 1-5.2.5).
H
G
Multiply lines E and F.
Total stand-by
AH
AH
H
Alarm sounding period in hours.
(For example, 5 minutes = 0.0833 hours.)
H
I
Multiply lines E and H.
Total alarm
AH
AH
J
Add lines G and I.
Total stand-by and alarm
AH
AH
K
Multiply line J by 1.30.
(30% extra insurance to meet desired performance)
Total ampere - hours required
AH
Units are capable of recharging 36AH battery max. If total ampere - hour required exceeds 36AH,
decrease AUX current to provide enough stand-by time for the application.
