🔌 Emergency Preparedness Tool

Home Generator Sizing Calculator

Select essential appliances you plan to run during a hurricane, blizzard, or storm blackout to determine your required generator wattage capacity.

Select Essential Appliances:

Refrigerator / Freezer

700W Running • 2200W Starting

2,200W

Window Air Conditioner (10k BTU)

1200W Running • 3000W Starting

3,000W

Microwave Oven

1000W Running • 1200W Starting

1,200W

Wi-Fi Router & Fiber Gateway

25W Running Continuous

25W

Living Room & Bedroom LED Lights (x10)

150W Continuous Total

150W

Sump Pump (1/2 HP)

800W Running • 2100W Starting

2,100W

CPAP / Medical Machine

200W Critical Medical Backup

200W

Central AC (3-Ton Whole Home)

3500W Running • 8000W Starting

8,000W

Total Running Watts 875 W Continuous Load

Total Starting Surge 2,375 W Peak Startup Surge

Recommended Generator 3,500W Inverter / Portable

⚠️ Always allow a 20% safety margin to prevent generator breaker trips. Never run generators indoors!