Inside the app
A closer look.
About this app
Made for a clear purpose.
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.
