Determining The Size Of The Standby Battery - First Alert FA2000C Installation And Setup Manual

Worksheet 3: Auxiliary Relay Output Current Load
Device Model #
4. In Worksheet 4, enter the total calculated subtotals of all listed outputs from Worksheets 1 through 3, then add
to get the combined current.
Worksheet 4: Total FA2000C Current Load
FA2000C PCB Current (Includes 2-wire smoke detector and LED indicator PCB
NOTE: Limit the total power supply standby current to 210mA when a 60-hour standby time is desired.

Determining the Size of the Standby Battery

Use the worksheet below to calculate the required battery capacity.
DO NOT use Gates batteries (sealed lead-acid type). These batteries require a different charging voltage than is
supplied by the panel.
Use Worksheet 5 to determine the required backup battery capacity and use the Battery Selection Table to determine
the battery model number. A dual battery harness is supplied that allows two batteries to be wired in parallel for
increased capacity.
5. Using the total calculated from Worksheet 5, calculate the battery capacity required for the
installation.
Worksheet 5: Battery Capacity Calculation Worksheet
Capacity
Standby Capacity
Alarm Capacity
Total Capacity
6. Use the Battery Selection Table to select the appropriate battery for the installation.
Device Current X # of Units =
Auxiliary Relay Output Subtotal
(terminals 5, 6, or 7 & 18 – 350mA max.)
Auxiliary Relay Output Subtotal
(350mA max. standby; 1.0A max. alarm)
Formula
Total standby current X 24 or 60 hours X 1.1 contingency factor.
Total alarm curr. X 0.1 (6 min)
Add standby and alarm capacities (14AH max.)
Auxiliary Power Subtotal
Bell Output Subtotal
currents)
Total Current Load
Section 2 – Installing the Control
Total Current
Standby
XXXXXX
XXXXXX
XXXXXX
XXXXXX
XXXXXX
XXXXXX
Total Current
Standby
155mA
Calculated Value
Alarm
Alarm
235mA
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