Specifications

FS-250 Installation and Operation Manual
45
Total System Currents
STANDBY (A) ALARM (A)
Total Panel and Modules current
Total Auxiliary current + +
Total Device current + +
TOTAL PANEL+ Modules + DEVICES
Use the Total Panel+ Modules + Devices for the Battery Size Calculations
Battery Size
Total Standby Current
(from above)
Hours of Standby Required per
NFPA 72 Standard (4, 24 or 60)
AH for Standby
A. x ____ Hours =
Total Alarm Current
(from above)
5 Minutes of Alarm Operation
per NFPA 72 Standard*
AH for Alarm
A. x 0.33 Hours =
A.H. for
Standby
A.H. for
Alarm
Calculated
A.H.
De-rating
Factor
A.H. Required
Battery Capacity
+ = X 1.25 =
Notes:
1. An additional multiplier is included to compensate for the higher discharge rate in alarm. Battery capacity
decreases with age.
2. The Standby current + Alarm current must never exceed 3.0 Amps when using one Transformer, and
6.0amps when using the FS-NPE optional transformer assembly.
3. The following states the maximum standby current allowed for a FS-250 panel using a 38.5 AH battery
set:
60 hours of standby time is 0.457 Amps
24 hours of standby time is 1.144 Amps
4. Does not include lamp or LED current, add separately. Refer to FS-SAU2 Installation Instructions for
maximum activated current rating of individual drive circuits.
Technical Manuals Online! - http://www.tech-man.com