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Appendix D: Power Supply and Battery Calculations
Battery Capacity Requirement
Battery (AH) = (Standby Current Total x Discharge Time) + (Alarm Current Total x Alarm Time)
(
[STANDBY (A) ______ ] X [(24 or 60 Hours) ___ ] ) + ( [ALARM (B) ______ ] X [Alarm in Hr. _____ ] ) = (C) ______AH
Total Alarm Current must be 5.5 amperes or less. Indicating Circuits must not to exceed 5 amperes.
Battery Selection:
Battery Size = Multiply (C) by 1.20 to derate battery.
Mircom recommends the following batteries for use with this panel:
Batteries:
• BA-110 (12 AH) will fit into the FX-350 backbox.
• BA-110 (12 AH) and BA-117 (18 AH) will fit into the FX-351/353 and BBX-1024DS(R)
backboxes.
• BA-124 (26 AH) batteries will fit into the BC-160 Battery Cabinet.
Use of alternative batteries may result in failure of the panel to meet agency and regulatory
requirements, and may result in shortened battery life. Batteries should be tested regularly,
and replaced at least every three years.
Table 11 FX-350 Batteries
MIRCOM BATTERY SIZE UL/ULC RATING
BA-110 12AH 10AH
BA-117 18AH 17AH
BA-124 26AH 24AH
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