System Sensor PDRP-1002 - Manual (Page 29)

Ampere-Hour Calculations Appendix A: Power Calculations
The PDRP-1002 PN 51135:A 03/11/99 29
Ampere-Hour Calculations
Table 2 Ampere-Hour Calculations
Select a battery with an equal or greater amp/hour rating than the figure obtained
in Table 2. Batteries must be lead-acid type.
PS-1270 12 volt, 7 amp/hour (two required)
PS-12120 12-volt, 12 amp/hour (two required)
Notes:
1.
Alarm amp-hours assumes a maximum system draw of 3 amps in alarm for 5
minutes (0.25 amp/hour) or for 10 minutes (0.5 amp/hour)
2. NFPA 72 Central Station and Local and Proprietary Fire Alarm Systems require 24
hours of standby.
3. NFPA 72 Auxiliary and Remote Station Fire Alarm Systems require 60 hours of
standby.
4. Factory Mutual Systems require 90 hours of standby.
5. The battery charger in this panel will charge a maximum of 15 amp/hours of
batteries within 48 hours (7 amp/hour minimum). Batteries larger than 12 amp/
hour will require a UL listed battery cabinet (e.g. NOTIFIER BB-17).
Standby Battery Current
Convert the total from
Table 1 to amps and enter
here StandbyTime
24, 60, or 90
hours
amps X hours =
Standby
amp/hours
Alarm
amp/hours
Total amp/
hours needed
Enter 0.25 for 5 minutes in alarm
or 0.5 for 10 minutes in alarm
+
Add Standby and Alarm amp/hours =