997-492-000-5, Issue 5
June 2009
38
EN54 & ISO 7240 2-8 Zone Conventional Fire Panel - Installation & Configuration Manual
9 Battery Calculation
The table in Section 6.4.1 Standby Batteries can be used
to select the correct battery size. If full calculations are
required use the procedure below.
General Data
PSU size Maximum Maximum Internal
No. of sounder External Battery Size
Circuits Alarm Load Range
1.8A 2 1A 2.8 - 7Ah
Standby Load (Amps)
Standby Load in Amps No. Current Total
Basic panel 1 0.034 0.034
Device quiescent current
(max 2mA per zone)
EOL Current (per zone) - 0.0056
fitted with Resistor EOL
Optional 4-way Sounder PCB(s) 0/ 1/ 2 0.047
Auxiliary equipment *
Total Standby Load (L1)
Peak/ Alarm Load (Amps)
Alarm Load in Amps Qty Current Total
Basic panel 1 0.034 0.034
Zones alarm current 2/ 4/ 8 0.03
Optional 2-way Relay PCB 0/ 1 0.04
Optional 8-way Relay PCB(s) 0/ 1/ 2 0.08
Sounder output 1
Sounder output 2
4-way Sounder PCB outputs **
Auxiliary equipment *
Total Alarm Current (L2)
Total <1.8A
Calculation
C
min
= 1.25 {(L1 x T
1
) + (2 x L2 x T
2
)}
= 1.25 x .................................. A
= ........................................... Ah
Next available battery ........................... Ah
T
1
= Standby time in hours, e.g. 24, 72, etc.
T
2
= Alarm time in hours.
This formula calculates the battery capacity required to
provide the specified standby period plus half-hour alarm
load in accordance with BS5839 Part 1 and LPS1014.
* Ensure that any current taken from the
Auxiliary output through the relay circuits are
included in the ‘Auxiliary equipment’ boxes
for alarm and quiescent.
** If an external PSU is not being used for the
Sounder PCB(s) ensure that the battery
calculations cover the loading of these
circuits, including the quiescent current(s).
If using an external PSU for the 4-way
sounder PCB(s) enter a value of ‘0’ in the
last column.
The values given at right are for a basic
panel fit, i.e. with the internal PSU but
without any optional PCBs fitted.
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