What Size Generator Do I Need for My House?

Generator size depends on what you want to keep running during an outage, not the size of your house.

Step one: decide what matters

Essentials only (refrigerator, furnace blower, some lights, sump pump, internet) need far less than a whole house that also runs central air, an electric range and an EV charger.

Step two: add up the watts

List the running watts of each item, then account for starting watts: motors in air conditioners, pumps and refrigerators briefly draw several times their running power. An electrician uses a load calculation instead of guessing.

Step three: choose the type

• Portable generators are cheaper but must never be run indoors or in a garage, and must not be plugged into a wall outlet.

• Standby generators are permanently installed, start automatically and run on natural gas or propane.

Safety: the transfer switch

A transfer switch (automatic or manual) is required so generator power cannot flow back into the utility lines, which can seriously injure line workers. Installation normally requires a permit and inspection, and gas connections must be done by a qualified gas fitter.

FAQ

Is a bigger generator always better?

No. An oversized unit costs more and can run inefficiently.

Where can it be placed?

Clearances from windows and structures are set by code and the manufacturer; your village may add rules.

Ask Miron Electricians for a generator estimate at 224-305-7329.

Disclaimer: This article is general information only and is not professional advice. Electrical conditions and local code requirements vary, and electrical work can be dangerous. Miron Electricians is not responsible for any action taken or not taken based on this article. For advice about your own home or business, have a qualified electrician inspect it. Call Miron Electricians at 224-305-7329 to schedule an inspection or request a quote.