Wattmargin: Outage Planner
Backup Power Load Plans
$0.99 · Designed for iPad. Not verified for macOS.
Compare running load, startup demand, daily energy, and estimated runtime against your generator, battery station, or inverter.
Wattmargin is a private backup-power planning workbench for deciding what you intend to run before an outage begins.
Build a load list from equipment labels and manuals, choose must-run and rotating appliances, enter duty cycles, and compare running watts, worst startup demand, and estimated daily energy against a generator, battery power station, or inverter. Runtime estimates help reveal tradeoffs before the household is operating under pressure.
KEY FEATURES
- Generator, battery station, and inverter profiles
- Continuous and surge-watt margins
- Daily watt-hour planning with duty cycles
- Conservative single-load startup analysis
- Battery and generator runtime estimates
- Must-run, rotating, and optional priorities
- Circuit directory and readiness checklist
- Local PDF outage plan
- Offline field-reference guide
- No account, ads, tracking, analytics, subscription, or network requirement
Wattmargin is an estimation and planning tool. Actual demand and runtime vary with equipment, temperature, age, fuel, wiring, and operating conditions. Never connect a generator directly to building wiring or a receptacle. Follow manufacturer instructions and use a licensed electrician for transfer equipment or fixed wiring.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Robert Corbin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Robert Corbin
- Size
- 24.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Robert Corbin
