System calculations
A.8
QS4 Technical Reference Manual
Battery calculation worksheet
Use this worksheet to determine the amperage capacity of the panel's standby battery. You can obtain operating
current requirements for field devices from their respective installation sheets.
Example:
There are 10 strobes rated at 80 mA and 40 mini–horns rated at 10 mA connected to NAC circuits
powered by AUX 1. Enter 1200 mA in the Alarm box for AUX 1.
Standby
Current (mA)
Alarm
Current (mA)
Base Panel (Form A)
SMK/ACC power (FormB)
AUX 1 load
[1]
AUX 2 load
AUX 3 load
Loop 1 load
Loop 2 load
Loop 3 load
Loop 4 load
Total Current
[2
]
×
hr
×
min
÷
60
+
=
mAh
×
1.2
mAh
÷
1000
Battery size
[3]
====
Ah
Notes
[1] Maximum 1.5 A per AUX circuit.
[2] If the Total Current Required value exceeds 6 A, switch part of the load to an auxiliary power source. The
auxiliary power source must be UL/ULC listed for Fire Protective Signaling Systems.
[3] If the calculated battery size exceeds 40 Ah, switch part of the load to an auxiliary power source.
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