Wattmargin

Plan a realistic backup-power load list before the lights go out.

See the Margin

Compare selected appliance running watts, startup demand, daily energy, and estimated runtime against a generator, battery station, or inverter.

Outage Tools

Priority and duty-cycle planning
Continuous, surge, and energy limits
Circuit directory and readiness checklist
Offline field guide and local PDF plan

Private by Design

No account, ads, tracking, analytics, cloud sync, or subscription. Equipment details and plans stay on your device unless you deliberately share a report.

Electrical Safety

Wattmargin is an estimation and planning tool. 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.