Note: A battery and loop calculation spreadsheet is available from your panel
supplier to assist in site calculations
18.Battery Standby Capacity Calculation
This section describes how to calculate the minimum required standby battery
capacity for the control panel. To determine the battery capacity, perform the
following steps:
1. Look-up the mains failed fault battery current. Enter this value as I
panelfault
.
2. Look-up the mains failed alarm battery current. Enter this value as I
panelalarm
.
3. Calculate the quiescent load on each loop in mA. Add these values and enter the
result as I
loopsfault
. Multiply the figure by 1.5 to derive the current drawn from the
battery and enter this figure in the table.
4. Calculate the maximum alarm load on each loop in mA. Add these values and
enter the result as I
loopsalarm
. Multiply the figure by 1.5 to derive the current drawn
from the battery
5. Calculate the maximum load on the alarm circuits in mA in an alarm condition.
Enter this value as I
alarms
and enter this figure in the table.
6. Calculate the load on the auxiliary supply in mA in an alarm condition. Enter this
value as I
auxfault
.
7. Calculate the load on the auxiliary supply in mA in an alarm condition. Enter this
value as I
auxalarm
.
8. Calculate the total battery load in fault, I
fault
.
9. Calculate the total battery load in alarm, I
alarm
.
10. Enter the required standby time in hours, T
fault
.
11. Enter the required time in alarm in hours, T
alarm
.
I
panelfault
=
………mA I
panelalarm
=
………mA
I
loopsfault
=
1.5 x ……mA
=
………mA I
loopsalarm
= 1.5 x ……mA
=
………mA
I
alarms
=
………mA
I
auxfault
=
………mA I
auxalarm
=
………mA
I
fault
=
………
mA I
alarm
=
………
mA
T
fault
=
………
hrs
T
alarm
=
………
hrs
12. Substitute the values in to the formula below.
C
min
=
1.25 x ((T
fault
x I
fault
) + 2 x (T
alarm
x I
alarm
))/1000 Ah
=
1.25 x (
(………
x
………)
+ 2 x (
………
+
………
))/1000
Ah
=
1.25 x (
………
2 x
………
)/1000 Ah
1.25 x (
……… + ………
)/1000 Ah
=
1.25 x
………
/1000 Ah
=
………
/1000 Ah
=
………
Ah
13. Select the next highest available battery size.
Notes:
Page 36 of 111
02/10/03
Содержание Premier AL
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