Bosch DS7240V2 - 66.0 Standby Battery Calculation

Page 136 P/N: 4998152533-02 Copyright  2007 Bosch Security Systems, Inc. DS7200V2-UK Installer's Guide
PART V: REFRENCE MATERIALS
66.0 Standby Battery Calculation
A
AC Power On
Normal Current
B
AC Power Off
Minimum Current
C
In Alarm
Maximum Current
Model
Number
Quantity
Used
Each
Unit
1
Total Each
Unit
Total Each
Unit
Total
DS7240V2/
DS7220V2
85 x 1 = 85 85 x 1 = 85 120 x 1 = 120
Keypads:
DS7445i/
DS7445V2
35 x Qty = 35 x Qty = 115 x Qty =
DS7447E/
DS7447V2
100 x Qty = 100 x Qty = 100 x Qty =
Accessories:
DX2010 35 x Qty = 35 x Qty = 35 x Qty =
DX3010 10 x Qty = 10 x Qty = 10 x Qty =
DX3020 10 x Qty = 10 x Qty = 10 x Qty =
DX4010i/
DX4010
25 x Qty = 25 x Qty = 25 x Qty =
DX4020 84/110
2
x Qty = 84/110
2
84/110
2
x Qty = 84/110
2
84/110
2
x Qty = 84/110
2
RF3227E 30 x Qty = 30 x Qty = 30 x Qty =
Sounders Connected to PO 2:
D118 8 Ω
Speaker
0 x Qty =
0 x Qty = 330 x Qty =
Ratings of Other Devices in System that are not Shown Above:
x Qty = x Qty = x Qty =
x Qty = x Qty = x Qty =
x Qty = x Qty = x Qty =
x Qty = x Qty = x Qty =
x Qty = x Qty = x Qty =
Total A = Total B = Total C =
1
Currents shown in milliamperes (1 ampere = 1,000 milliampere)
2
84 mA max, 80 mA nominal 10 Base-T ; 110 mA max, 100 mA nominal 100 Base-T
Use the following formula to calculate standby battery capacity for 24 hours of standby power :
(Total B ____ x 24 hrs) + (Total C ____ x 0.067 hrs) + 10% reserve = Total battery Ah required
If the Column C total exceeds 1.2 A, then an external power supply is required.