Specify Backup Battery For Power Supply - VESDA VLQ-100 Product Manual

VESDA by Xtralis
4.3

Specify Backup Battery for Power Supply

In the event of a mains power supply disruption, the VLQ detector runs on a backup battery connected to the
external power supply. The size of the battery is determined by:
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
l
Note: It is recommended that batteries connected to the external power supply 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.
Equipment
Detector
Other 24V Loads
www.xtralis.com
Table 4-2: Calculating the size of backup battery
Normal loads @ 24 V DC
Load mA Qty
170
Total
mA
Standby Hours
Standby Capacity
Full alarm load @ 24 V DC
Total Load mA
190
X
Alarm Hours
=
Alarm Capacity
Total Capacity =
Standby + Alarm
Divided by 1000 for
Standby Capacity
Multiply by battery
factor X1.25
VESDA VLQ Product Guide
Qty Total
Total
mA
X
25