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PREMIER SX INSTALLATION MANUAL.
Approved Document No: GLT.MAN-101T
PAGE 14
Issue : 1.6s Authorised: GH Date: 06/11/2002
10. STANDBY BATTERY CALCULATION GUIDE
The standby time of the Fire Alarm Panel after the mains has failed depends on the quiescent loading
of the Panel. The alarm load of the panel and the capacity of the batteries.
To determine the capacity of batteries required for any given standby period, the following formula
should be used: -
Standby Time in Ahr = 1.25 x [(Ta x Ia) + (Ts x (Iqp+Iqz))]
The multiplier 1.25 is present to account for lost capacity over the life of the batteries.
Ts = Number of hours standby required
Iqp = The quiescent current of the Panel = 0.048A (48mA)
This figure is with the Mains failed, buzzer operative and the Power Supply and General Fault
indicators lit. If there are other quiescent drains on the Panel then these must be added .
Iqz = The total quiescent current of all zone devices
As a guideline, the quiescent current of most modern detectors is typically 0.00005A (50uA), and that
of manual call points is zero. To obtain the most accurate figures consult the devices manufacturers’
specification.
Ia = The total alarm current of the sounders (plus any other devices being supplied by the panel in
an alarm condition).
Ta = The amount of time in hours required for the alarm (most commonly being half an hour).
Example 1
Panel has a total of 50 detectors each consuming 50uA each, 20 Sounders at 20mA each, the
required standby time is 24 hours and the alarm time is 0.5 hours.
Iqz = 50 x 0.00005 = 0.0025A
Iqp = 0.050A
Ia = 20 x 0.02 = 0.4A
Ts = 24 hr
Ta = 0.5 hr
Standby Time in Ahr = 1.25 x ((0.5 x 0.4) + (24 x (0.50 + 0.0025))) = 1.825 Ahr
(Suggested Batteries 2 x 12V , 2.2Ahr)
Example 2
Panel has a total of 100 detectors each consuming 40uA each, 40 Sounders at 20mA each, the
required standby time is 72 hours and the alarm time is 1 hour.
Iqz = 100 x 0.0000 = 0.004A
Iqp = 0.050A
Ia = 40 x 0.02 = 0.8A
Ts = 72 hr
Ta = 1 hr
Standby Time in Ahr = 1.25 x (1 x 0.8 + 72 x (.050 + 0.004)) = 5.9 Ahr
(Suggested Batteries 2 x 12V , 6Ahr)