Home Emergency Backup Power & Load Sizing Engine
Determine exact Running Watts and Motor Starting Surge Peaks. Calculate generator size (kW), required breaker panel transfer switch, wire gauge, and battery runtime for storm outages.
Emergency Appliance Load Sizing Rig
Click the appliances you need to power during a utility blackout. The engine computes simultaneous running load, surge inrush overhead, and transfer switch spec.
⚡ Standby Sizing Recommendation
Select appliances above to calculate whether a portable 2,000W inverter, a 7,500W dual-fuel generator, or a whole-home standby unit is required.
Explore the 4 Emergency Backup Engineering Silos
Peer-reviewed electrical blueprints, fuel burn models, and NEC-compliant connection diagrams.
Appliance Power Guides
Exact running vs. starting wattage benchmarks for well pumps, sump pumps, central 3-ton/4-ton AC units, and medical CPAP machines.
- ➔ Refrigerator & Freezer Sizing
- ➔ Central AC 3-Ton Soft Starter Guide
- ➔ 1/2 HP vs 3/4 HP Well Pump Surge
Generators & Fuel Operations
Inverter THD harmonic distortion, dual-fuel propane vs gasoline burn rates, floating neutral safety, and winter freeze break-in.
- ➔ Floating Neutral vs Bonded Neutral
- ➔ Dual-Fuel vs Tri-Fuel Runtime
- ➔ Inverter vs Open-Frame THD Limits
Solar & Battery Backup
LiFePO4 chemical cycle life, solar recharge sizing (400W array), low-temperature winter charge cutoffs, and AC coupling.
- ➔ LiFePO4 vs Lithium-Ion Safety
- ➔ 400W Solar Panel Array Sizing
- ➔ Winter Freezing Temperature Cutoff
Transfer Switches & Wiring
Mechanical interlock kits vs automatic transfer switches (ATS), 30-Amp vs 50-Amp inlet boxes, wire gauge rules, and soft starters.
- ➔ Interlock Kit vs Manual Transfer Switch
- ➔ 30-Amp Inlet Box Wire Gauge Spec
- ➔ Soft Starter Wiring for Central Air
US Regional Grid Outage & Climate Resilience Matrix
Select your geographic climate zone to inspect typical outage durations, historical grid reliability scores, and the optimal generator and battery fuel strategy.
Whole-Home Emergency Power Connection Architecture (NEC 702)
Standardized code-compliant connection diagram separating the outdoor generator power source, NEMA 3R rainproof inlet box, mechanical panel interlock, and household branch circuits.
Generator Fuel Burn Rate & Outage Autonomy Calculator
Compare gallons of gasoline vs 20-lb propane tanks required for 24h to 72h continuous emergency operation.
| Generator Size | Load Level (Watts) | Gasoline (Gal / Hr) | Propane (Lbs / Hr) | 24-Hour Fuel Required | Estimated Cost / Day |
|---|---|---|---|---|---|
| 2,200W Inverter | 500W (25% Load) | 0.12 Gal/hr | 0.55 Lbs/hr | 2.9 Gallons Gas | $9.50 – $12.00 |
| 3,500W Inverter | 1,750W (50% Load) | 0.28 Gal/hr | 1.25 Lbs/hr | 6.7 Gallons Gas | $22.00 – $28.00 |
| 7,500W Dual-Fuel | 3,750W (50% Load) | 0.58 Gal/hr | 2.60 Lbs/hr | 13.9 Gal / 3.1 Tanks | $48.00 – $65.00 |
| 12,000W Whole-Home | 6,000W (50% Load) | 0.95 Gal/hr | 4.20 Lbs/hr | 22.8 Gal / 5.0 Tanks | $78.00 – $105.00 |
⚠️ Critical Electrical & Life Safety Protocols (NEC 702 & UL 2201)
1. Never Backfeed Through Dryer Outlets: Connecting a portable generator using a double-male plug ("suicide cord") energizes neighborhood utility lines, risking fatal electrocution of utility linemen. Always install a mechanical interlock kit or code-compliant transfer switch.
2. Carbon Monoxide Buffer Distance: Generators must be positioned at least 20 feet (6 meters) away from all residential windows, doors, and fresh air intake vents with exhaust directed outward.