Xtrails VESDA-E VEP-A00 - Page 49

VESDA-EVEP-A00-P Product Guide
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4.3.12 Specify Backup Battery
In the event of a mains power supply disruption, the VEP-A00 detector runs on a backup battery located in the
external power supply (the power supply must be compliant with local fire protection codes and standards).
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.
Equipment Normal loads@ 24 V DC Full alarm load @ 24 V DC
Load (A) Qty Total Load (A) Qty Total
Detector set to Fan Speed 1 0.29 0.33
Detector set to Fan Speed 5 0.37 0.40
Other 24V Loads Total
(A)
Total
(A)
X X
Normal Hours Alarm Hours
=
Normal Capacity Alarm Capacity
Total Capacity =
Normal + Alarm
Multiply by battery
factor X1.25
Table4-3: Calculating the size of backup battery