
Control Panel Description and Installation
150964 4-11
4.9.4 Battery Calculation Worksheet
To ensure 24-hour standby, the total standby current must not exceed:
285 mA if a battery only is used.
450 mA if the Model 4195 Auxiliary Power Supply is used.
Total alarm current must not exceed 2.25 Amps.
4.9.5 Standby Current For DACT Compliant Installations
In order to meet the 24-hour standby requirement the total standby current Must Not exceed
475mA for the system using both the 4821/4820 Control Panel and the 4195 Auxiliary Power
Supply. The combination of these supplies provides 14 amp hours of standby power.
If your system configuration exceeds 475 mA of standby current you must provide additional
power from an external power supply. Silent Knight has tested the following power supplies
for compatibility with the 4821/4820 Control Panel:
• Alarm Saf Model PS5-BFS-12-UL
• Altronix Model AL400ULX
Table 4-4: Battery Calculation Worksheet
Device
Standby
Current
Alarm
Current
A
Total current used by 4821/4820
(from Table 4-3, Row C)
mA mA
B
Total current ratings converted to amperes
(Line A x .001)
AA
C Number of standby hours (for example, 24) H
D Multiply lines B and C AH
E
Alarm sounding period in hours
(For example, 5 minutes = .084 hours)
H
F Multiply lines B and E AH
G Add lines D and F AH
H
Multiply line G by 1.2
(Total ampere hours required)
AH
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