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D7024 | Operation and Installation Guide | 2.0 Overview
Table 3:
Standby Battery Capacity Calculations
D7032 8-Point LED Annunciator Expander
D7033 Keypad
D7039 Multiplex Expansion Module
D7042/B Addressable 8-Point Input
D7050 Photo Smoke Detector
D7050-TH Photo Smoke Detector
D7045 Multiplex Pull Station
D7044 Multiplex Single Input Fire
D7052 Multiplex Dual Input Fire
D7053 Multiplex I/O Module Fire
Smoke Detectors
Bells, Horns, and so on
Other Sensors
Other
* Add 30 mA for each relay activated.
The 24 VDC current requirements for the D7030, D7033 and D7035 are shown at 75% of the 12 VDC level shown
on the specification sheets for these models. The D7024 regulates 24 VDC power from the battery to 12 VDC for
these accessories.
The required battery size to support the system can be calculated using Table 3 and Table 4.
Table 4:
Calculating the Required Battery Size
Grand Total Standby Current (in amps)
Total Hours of Standby Required (24 or 60)
Total Standby Capacity (multiply CS X HS)
Grand Total Alarm Current (in amps)
Total Hours of Alarm Time Required (usually 0.083 or 0.25)
Total Standby Capacity (multiply CA X HA)
Total Capacity Required (add TA + TS)
Required Capacity with 20% Derating (TC X 1.2)
2. 1 1
Standby Current Load
1.
Use Table 4 to estimate the size of the battery required to support the standby load.
2. Use the second table to estimate the size of the battery required to support the alarm load.
3. Add the results for the total battery size.
4. Select the next larger standard battery for the system.
If the results show a requirement for a battery over 40 Ah, reduce the current or add an external power supply.
Refer to Table 5 on page 11 for the units in amp hours (Ah). The calculations include a 20% derating factor.
10
1 mA
80 mA
150 mA
150 mA
8 mA
0.50 mA
0.50 mA
0.55 mA
0.55 mA
0.55 mA
0.70 mA
Grand Total
Standby Current
CS
HS
TS= CS X HS
CA
HA
TA= CA X HA
TC = TA + TS
C = TC X 1.2
90 mA
100 mA
150 mA
150 mA
8 mA
0.56 mA
0.56 mA
0.55 mA
0.55 mA
0.55 mA
0.70 mA
Grand Total
Alarm Current
Bosch | 7/05 | 31499J
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