Installation Guide

FPP-RNAC-8A-4C | Operation and Installation Guide |
12 Bosch Security Systems, Inc. | 8/09 | F01U025431-02
You can use the format in
Table 3 to calculate the required battery size to support the system. Use Table 4 and
Table 5 on page 13 to estimate the required battery size.
Table 3: Standby Time Calculation
Device Quantity Standby
Current for
Each Device
Total Standby
Current for Each
Device (Quantity x
Standby Current for
Each Device)
Alarm Current
for Each Device
Total Alarm
Current for Each
Device (Quantity x
Alarm Current for
Each Device)
FPP-RNAC-8A-4C
Remote NAC Power
Supply
1 150 mA 150 mA 150 mA 150 mA
Grand Total
Standby Current
Grand Total
Alarm Current
Table 4: Calculating the Required Battery Size
Descriptions Calculations
Grand Total Standby Current (in amps [A]) CS
Total Hours of Standby Required (usually 24 or 60) HS
Total Standby Capacity (multiply CS x HS) TS = CS x HS
Grand Total Alarm Current (in amps) CA
Divide by 0.6 CAA = CA ÷ 0.6
Total Hours of Alarm Time Required (usually 0.083 [5 min.] or 0.25 [15 min.]) HA
Total Hours Capacity (multiply CAA x HA) TA = CAA x HA
Total Alarm Capacity Required (add TA + TS) TC = TA + TS
Required Capacity with 20% Derating (TC x 1.2) C = TC x 1.2