# Battery Size Calculations - Siemens PAD-4 Installation, Operation And Maintenance Manual

Distributed power module nac expander

PAD-4 Installation, Operation and Maintenance Manual
6.2

## BATTERY SIZE CALCULATIONS

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A. Up to two PAD-4 boards can be connected to a common battery set. When calculating for 2 PAD-4 boards
I.
Both boards must be mounted on S3AP adapter plates on System 3 rails in the same enclosure.
II.
One of the boards must have the battery charger circuit disabled.
III. The board with the ACTIVE charger is limited to 1.50 amps for the aux. power (TB16, Aux Pwr Supply+, Aux Pwr Supply-).
IV. Both sets of battery connections are to be connected to the same battery set using 2 battery connection splitters, P/N 230-299203.
B. The Alarm Current from sections 3 and 4 above must never exceed 6.0 amps for FP2011-U1 or 9.0 amps for FP2012-U1.
C. Alarm operation length while on battery power varies with application and local codes. Check with the AHJ to determine if 5 minutes (0.0833
hours), 30 minutes (0.5 hours), 1 hour, or 2 hours of alarm operation is required. For Carbon Monoxide (CO) alarms, the alarm operation is
12 hours for local systems, and 1 hour for systems that utilize off-premises monitoring.
D. Battery rating required cannot exceed 18 A.H.
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