Alarm Battery Backup Calculator
A burglar-alarm panel’s standby battery has to keep the system alive through a mains cut and still have enough left to drive the sirens when it triggers. Enter the panel’s quiescent draw, the hold-up hours you need, the siren current and how long it must sound to get the required battery amp-hours — and the next standard size to fit. Planning figures; runs in your browser.
Planning estimate only — the required standby time is set by your installer or insurer, so confirm it rather than trusting a default. Sealed lead-acid batteries fade and are best replaced every 3–5 years; a dead standby battery means no protection during a cut, so test under load and log the result. Verify against the panel and battery datasheets and a timed test.
Plan the backup & the alarm
Related Guides — Deep-dive reading
UPS and Battery Schedule for India (2026): Keeping the System Alive Through a Cut
A ready-to-adapt schedule that lists each backup unit, what it protects and the autonomy it must deliver, so cameras, panels, controllers and the recorder ride through India's frequent power cuts.
SecurityElectrical Backup Assessment for Home Security in India
The under-appreciated gap: a power cut silently disables your cameras, NVR, alarm, gate motor, router and Wi-Fi, leaving the home undefended exactly when it may be most vulnerable. How to map the security load, test what your inverter really covers, size backup, and protect against grid surges.
SecurityInverters & Batteries: How They Work & How to Size Them
The silent workhorse of Indian home backup — how an inverter turns battery power into mains, what the VA rating means, why sine-wave matters, how to size the inverter to your load and the battery to your backup hours, and how to keep the system healthy.
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