VESDA
®
LaserSCANNER Installation Manual
Version 1.3 7
5. Battery Backup Calculations
The nominal supply voltage is
24 VDC.
Use Table 2 to calculate and to determine the battery
backup requirements for your VESDA system. Refer to Table 1, page 3 for power consumption
details.
NORMAL LOAD @ 24 V DC FULL ALARM LOAD @ 24 VDC
EQUIPMENT LOAD
(mA)
QTY TOTAL
(ma)
LOAD
(mA)
QTY TOTAL
(ma)
LaserSCANNER
(No display &
programmer)
Display Module
Programmer Module
Remote Display
Other 24V loads
TOTAL (mA)
TOTAL (mA)
X
X
STANDBY HOURS
ALARM HOURS
=
X 1.06
STANDBY CAPACITY
(mAHr)
ALARM CAPACITY
(mAHr)
TOTAL CAPACITY =
STANDBY + ALARM
(mAHr)
DIVIDE BY 1000
MULTIPLY BY BATTERY
FACTOR 1.25
AHr
Table 2 Calculations to Determine the Battery Backup Requirements
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