🔋 NFPA 72 (24-Hour Quiescent Standby + 5-Minute Alarm), 1.20 Safety Factor

NFPA 72 Fire Alarm Secondary Battery Calculator

Size sealed lead-acid (SLA) secondary power backup batteries for commercial fire alarm control panels (FACP) under NFPA 72: calculate 24-hour non-alarm supervisory current (Amps), 5-minute full strobe alarm current, 1.20 safety de-rating factor, and Amp-Hour (AH) battery capacity.

1. Project & Operating Inputs

FACP Supervisory Standby Current (Amps e.g. 0.45 A)

Full Alarm Load Current (Amps e.g. 3.80 A)

Customer Bid Price for Power Supply & Battery Bank ($)

Aux Power Extenders, SLA Batteries & Commissioning ($)

2. Financial Breakdown & Yield

NFPA 72 STANDBY BATTERY SIZING

Turnkey Job Gross Profit

Life Safety Contractor Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost