Wattmargin turns a list of appliances and a backup-power source into a practical, private outage plan. Build a load library, record startup demand and daily use, map household circuits, compare operating profiles, and export a field-ready report without creating an account.
LIVE SCENARIO BENCH
• Compare your current plan, every catalogued load, must-run plus rotating loads, and must-run loads only
• Model reduced source output for heat, altitude, aging, or manufacturer-rated derating
• Hold back a fuel or stored-energy reserve instead of planning to empty
• See running demand, worst startup event, daily energy, estimated endurance, and remaining headroom update immediately
• Identify optional and rotating loads that recover the most energy or runtime first
LOAD AND SOURCE LIBRARY
• Record continuous and surge output for a battery station, portable generator, or vehicle inverter
• For stored-energy sources, enter usable watt-hours and conversion efficiency
• For generators, enter a manufacturer runtime point and rated load
• Record each appliance's running watts, startup watts, daily hours, duty cycle, priority, room, and notes
• Include or exclude equipment without deleting its record
CIRCUIT DIRECTORY
• Keep room-side breaker labels, outlets, fixtures, and notes together
• Associate saved loads with known circuits
• Build the directory using ordinary switches or plug-in testers without opening a panel
OUTAGE CHECKLIST AND NOTES
• Track preparation and shutdown checks in one place
• Keep household instructions and operating notes with the plan
• Restore the built-in sample plan at any time
SHAREABLE PDF
• Export the selected load plan, scenario comparison, endurance estimate, household notes, and circuit directory
• Keep planning assumptions visible for a household member or qualified electrician
OFFLINE OUTAGE ATLAS
• Browse 16 bundled visual reference cards with no connection required
• Review portable-generator carbon-monoxide and backfeed warnings
• Open the U.S. Consumer Product Safety Commission reference when you choose
PRIVATE BY DESIGN
Wattmargin has no account, ads, analytics, or developer-operated cloud service. Your plan is stored on your device. The only network action is an optional link you can open to the U.S. Consumer Product Safety Commission website.
IMPORTANT SAFETY BOUNDARY
Wattmargin is a planning notebook, not an installation guide or a substitute for manufacturer instructions, electrical codes, permits, or a qualified professional. Never run a portable generator inside a home, garage, basement, shed, porch, or carport. Keep it outdoors at least 20 feet from the home with exhaust directed away. Never backfeed home wiring through a wall outlet. Permanent wiring and transfer equipment require qualified installation.
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