This app is a backup power capacity calculator for Fire Alarm and Security Systems.

Batteries are used to provide the Fire Alarm and Security Systems with the required secondary (standby) power.

Most Fire Alarm and Security Systems connected to a central station are required to have 24 hours of battery standby power with an additional amount of power to operate the notification appliances for 5 minutes as per the Fire Alarm Code. If a voice evacuation system is installed, 15 minutes of alarm power is required.

This app calculates the backup power capacity (battery size). The calculations provided with this app are required by the Code and they must be provided as part of Fire Alarm and Security System Systems design documents.

In addition to calculator, an example calculation is provided in the help page of this app.

This app is developed and tested for all versions and sizes of iOS devices including iPhone and iPad.

What’s New

Version 2

This app has been updated by Apple to display the Apple Watch app icon.

Addressed user comments received so far
Revised to comply with the latest releases
Fixed minor bugs
Added text fields for alarm and standby current entries (used to be sliders which make it hard to enter exact values)

Ratings and Reviews

1.5 out of 5
2 Ratings

2 Ratings

App Privacy

The developer, Yuhsiu Lai, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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