# Fire Alarm Systems Backup Power Calculations Guide > Backup power capacity calculator for fire alarm and security systems. (iPhone/iPad app by Yuhsiu Lai.) - Source: https://appshunter.io/ios/app/fire-alarm-systems-backup-power-calculations-guide/id1048234032 (this page in markdown: same URL + `.md`) - Developer: [Yuhsiu Lai](https://appshunter.io/developer/433114647) - Category: Education, Reference - Price: $1.99 - Rating: 3.00/5 from 1 App Store ratings · 5 written reviews indexed - Age rating: 4+ - Requires: iOS 8.2 · 1 MB - Languages: American English - Released: 2015-10-17 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/fire-alarm-systems-backup-power-calculations-guide/id1048234032/reviews.md ## What is Fire Alarm Systems Backup Power Calculations Guide? 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. ## Key features - Backup power capacity calculator - Battery size determination - Standby power calculation - Notification appliance power calculation - Example calculation provided - Supports iOS devices ## Recent user reviews (5 of 5) All indexed reviews: https://appshunter.io/ios/app/fire-alarm-systems-backup-power-calculations-guide/id1048234032/reviews.md ### 1/5 — Waste of money *2021-10-28, version 2* Doesn’t work. Was hoping for a document showing calculations ### 1/5 — Fire battery checker *2021-09-09, version 2* On the iPhone 11 just does nothing so if anyone reads this review I would like a refund. ### 1/5 — Fire alarm engineer *2021-02-17, version 2* Don’t buy this it does not work ### 1/5 — Does not workout *2019-03-13, version 2* Does not work out sums correctly do not buy ### 1/5 — just simply doesn’t work at all. *2019-02-22, version 2* Using the latest iPhone X Max and this app just does not populate the milliamperes section when we click add. ## Frequently asked questions about Fire Alarm Systems Backup Power Calculations Guide ### What is the Fire Alarm Systems Backup Power Calculations Guide used for? The Fire Alarm Systems Backup Power Calculations Guide is used to calculate the required backup power capacity, specifically the battery size, for fire alarm and security systems. This ensures systems meet the 24-hour standby and 5- or 15-minute operational power requirements mandated by fire alarm codes. ### What are the specific power requirements calculated by the app? The app calculates the battery size needed for 24 hours of standby power, plus an additional amount for 5 minutes of alarm operation. For voice evacuation systems, it calculates for 15 minutes of alarm power. ### Is an example calculation available within the app? Yes, an example calculation is provided within the help page of the Fire Alarm Systems Backup Power Calculations Guide. This can assist users in understanding the calculation process. ### What devices does the Fire Alarm Systems Backup Power Calculations Guide support? The app is developed and tested for all versions and sizes of iOS devices, including iPhone, iPad, and iPod. It is compatible with devices running iOS. ### How often is the Fire Alarm Systems Backup Power Calculations Guide updated? The app was last updated on November 4, 2016, with version 2.0. While updates have not been frequent, the core functionality remains relevant for current code requirements. ### What is the user sentiment for the Fire Alarm Systems Backup Power Calculations Guide? Based on the available data, the app has a rating of 3.0 stars from 1 rating. This single rating suggests limited user feedback, making it difficult to gauge overall sentiment. ### Does the Fire Alarm Systems Backup Power Calculations Guide have ads? No, the Fire Alarm Systems Backup Power Calculations Guide does not contain advertisements. It is a paid application without any ad interruptions. ### What is the price of the Fire Alarm Systems Backup Power Calculations Guide? The Fire Alarm Systems Backup Power Calculations Guide is available for a one-time purchase of $1.99. There are no subscription fees or in-app purchases. ## Version history (last 2 releases) ### 2 — 2016-11-04 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) ### 1.1 — 2015-10-17 No release notes. ## More apps by Yuhsiu Lai - [Availability and Reliability](https://appshunter.io/ios/app/availability-and-reliability/id435033141) - [Battery Capacity Calculator](https://appshunter.io/ios/app/battery-capacity-calculator/id445176473) - [48VDC Power System](https://appshunter.io/ios/app/48vdc-power-system/id449477913) - [NEC Electrical Code Tools](https://appshunter.io/ios/app/nec-electrical-code-tools/id469334093) - [Engineer's Toolset](https://appshunter.io/ios/app/engineers-toolset/id478486737) - [Battery Current Simulator](https://appshunter.io/ios/app/battery-current-simulator/id488430945) All apps by Yuhsiu Lai: https://appshunter.io/developer/433114647 ## Related topics [fire alarm systems backup power calculations guide](https://appshunter.io/ios/topics/fire-alarm-systems-backup-power-calculations-guide) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*