Accurate fire alarm battery sizing made simple. Quick, free, and Aligned with
BS 5839
Fire Alarm Battery Calculator
Quickly estimate the minimum standby battery capacity required.
Result
Standby load of — mA, alarm load of — mA and a standby period of — hours with — minutes in alarm condition,
You will need – batteries or larger.
Actual value returned by calculation: – Ah
Formula: ((Quiescent mA × Standby H) + (Alarm mA × Alarm H)) ÷ 1000 × Factor
Call 0161 464 0984 Email KLHUse our free calculator to estimate the correct battery size for your fire alarm system. KLH Services Ltd provides installation, servicing, and maintenance of fire alarm systems across Manchester, Ashton under Lyne, Stockport, Tameside, Oldham, Rochdale, and the North West. Enter your panel’s load details to check the required standby and alarm capacity in line with BS 5839 recommendations.