# 12V Battery Runtime Calc — Amp-Hour Load Planner

> Amp-Hour Load Planner (iPhone/iPad app by 光 杨.)

- Source: https://appshunter.io/ios/app/12v-battery-runtime-calc/id6778157193 (this page in markdown: same URL + `.md`)
- Developer: [光 杨](https://appshunter.io/developer/1891134953)
- Category: Utilities, Productivity
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-06-11
- Data updated: 2026-08-25
- User reviews in markdown: https://appshunter.io/ios/app/12v-battery-runtime-calc/id6778157193/reviews.md

## What is 12V Battery Runtime Calc?

12V Battery Runtime Calc is an offline planning tool for estimating usable battery hours from amp-hours, battery count, load watts, usable depth, inverter loss, and reserve margin.

Use it when you need a quick runtime answer before packing gear, sizing a small RV or camping setup, or checking backup time at home or on site. Enter battery size, voltage, battery count, load watts, usable depth, system loss, and reserve, then review usable energy, gross runtime, planned runtime, reserve time, and battery count in one result sheet.

Built for narrow field use:
- Works offline after install
- No account required
- No ads or analytics SDKs
- Local calculation inputs only

Boundary: 12V Battery Runtime Calc is an estimating worksheet only. It does not certify electrical safety, battery health, wiring, charger sizing, code compliance, or emergency backup suitability.


## Version history (last 2 releases)

### 1.0.1 — 2026-07-08

Refined the 12V runtime planning presentation and clarified the offline battery worksheet scope.

### 1.0 — 2026-06-11

No release notes.

## More apps by 光 杨

- [ConcretePour Pro](https://appshunter.io/ios/app/concretepour-pro/id6761770433)
- [Roofing Cost Estimator](https://appshunter.io/ios/app/roofing-cost-estimator/id6761807843)
- [Cut Optimizer Pocket](https://appshunter.io/ios/app/cut-optimizer-pocket/id6761807889)
- [KitchenBatch Pro](https://appshunter.io/ios/app/kitchenbatch-pro/id6761807896)
- [Tile Layout Pocket](https://appshunter.io/ios/app/tile-layout-pocket/id6761807981)
- [TipSmart Splitter](https://appshunter.io/ios/app/tipsmart-splitter/id6761808040)

All apps by 光 杨: https://appshunter.io/developer/1891134953

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*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 2026-08-25.*