Disclaimer

Estimates, not engineering

GennySize results are estimates based on typical appliance values (see how we size). Your appliances may draw more or less — check their labels[1], and when in doubt choose a larger generator.

Connecting a generator

Connecting a generator to your home’s wiring, including any transfer switch or interlock, must be done by a qualified, licensed electrician.[2] Never plug a generator into a wall outlet (backfeeding): it can kill you and utility line workers.[3]

Carbon monoxide

Run generators outdoors only, at least 20 feet from your home, windows, doors and vents, and never in a garage — even with the door open.[4][5] Use battery carbon monoxide alarms near bedrooms.[6]

Medical devices

If someone in your home depends on a powered medical device, tell your utility and fire department and plan for outages with your provider.[7]

Affiliate links

Some links on this site are affiliate links. As an Amazon Associate I earn from qualifying purchases. This doesn’t change the price you pay or how we size generators.

Sources

  1. Virginia Cooperative Extension, Estimating Appliance and Home Electronic Energy Use
  2. OSHA, Using Portable Generators Safely (Fact Sheet)
  3. U.S. Consumer Product Safety Commission, Safety Alert: Portable Generator Hazards
  4. CDC, Carbon Monoxide Poisoning Basics
  5. U.S. Consumer Product Safety Commission, Carbon Monoxide Information Center
  6. CDC, What to Do to Protect Yourself During a Power Outage
  7. U.S. Food & Drug Administration, Tips about Medical Devices and Natural Disasters