Fire alarm standby battery sizing

Calculates minimum battery capacity (Ah) using a common sizing approach: Ah = (I_q x standby hours) + (I_a x alarm hours), then apply multipliers/derating.

Report details (optional)

Site name

Site reference / job number

Panel / system reference

Notes (optional)

Calculation inputs

Standby duration

If custom: standby hours

Alarm duration

If custom: alarm hours

Quiescent current Iq (A)

Alarm current Ia (A)

Safety multiplier (aging/margin)

Temperature derate (optional)

Other derate (optional)

Existing battery check (optional)

Check existing battery against required?

Existing battery configuration

Existing battery capacity (Ah)

Notes: These calculators are for engineering estimation / planning. Verify critical results with standards, manufacturer data, and site measurement.