VESDA by Xtralis VESDA VLI Product Guide
www.xtralis.com 27
3.2.11 Specify Backup Battery
In the event of a mains power supply disruption, the VLI detector runs on a backup battery. The size of the
battery is determined by:
l local codes and standards
l the total power required by the system
l back up time required
l allowance for reduction in capacity with age
l expected temperature variations
Note: It is recommended that batteries be inspected and changed as per manufacturer’s specifications or
as per local codes and standards.
To facilitate the calculation of the backup battery size, a Battery Calculation Sheet is included below.
Table 3-2: Calculating the size of backup battery
Equipment Normal loads@ 24 V DC Full alarm load @ 24 V DC
Load mA Qty Total Load mA Qty Total
Detector 415 440
Remote Display 60 110
Remote Programmer 50
(backlight off)
80
(backlight on)
Hand-held Programmer 50
(backlight off)
70
(backlight on)
System Relay Module 60 105
Other 24V Loads Total
mA
Total
mA
X X
Standby Hours Alarm Hours
=
Standby Capacity Alarm Capacity
Total Capacity =
Standby + Alarm
Divided by 1000 for
Standby Capacity
Multiply by battery
factor X1.25
Note: If the GPI is set to Mains OK, the aspirator speed will be maintained for one hour after the loss of
mains power, after which the aspirator speed will be limited to the minimum speed (speed setting 1)
to conserve power.
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