Table 3: Standby Time Calculation; Table 4: Calculating The Required Battery Size - Bosch FPP-RNAC-8A-4C Operation And Installation Manual

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
FPP-RNAC-8A-4C 1
Remote NAC Power
Supply

Table 4: Calculating the Required Battery Size

Descriptions
Grand Total Standby Current (in amps [A])
Total Hours of Standby Required (usually 24 or 60)
Total Standby Capacity (multiply CS x HS)
Grand Total Alarm Current (in amps)
Divide by 0.6
Total Hours of Alarm Time Required (usually 0.083 [5 min.] or 0.25 [15 min.])
Total Hours Capacity (multiply CAA x HA)
Total Alarm Capacity Required (add TA + TS)
Required Capacity with 20% Derating (TC x 1.2)
12
Standby Total Standby
Current for Current for Each
Each Device Device (Quantity x
Standby Current for
Each Device)
150 mA 150 mA
Grand Total
Standby Current
FPP-RNAC-8A-4C | Operation and Installation Guide |
Alarm Current
for Each Device
150 mA
Grand Total
Alarm Current
Calculations
CS
HS
TS = CS x HS
CA
CAA = CA ÷ 0.6
HA
TA = CAA x HA
TC = TA + TS
C = TC x 1.2
Bosch Security Systems, Inc. | 8/09 | F01U025431-02
Total Alarm
Current for Each
Device (Quantity x
Alarm Current for
Each Device)
150 mA