How Big of a Generator Do I Need to Run a House?

According to the U.S. Census Bureau, 25% of households reported losing power to their home in the last year. Understanding the right generator size for your home is crucial to ensuring you have enough backup power when it matters most. Here is how to determine the ideal generator size, from assessing your power requirements to choosing between portable and whole-house options.

Understanding your home's power needs

Without knowing how much power your home needs, you could end up with a generator that is too small, leaving important appliances without power, or one that is too large and more expensive than necessary. Consider three factors: the types of appliances and systems you plan to run, the wattage needs of each appliance, and whether you need continuous or peak power.

• Appliance types: most homes want essentials like refrigerators, freezers, heating and cooling, and some lighting; homes with medical equipment or sensitive electronics must factor those in.
• Wattage per appliance: larger appliances like refrigerators, air conditioners, and electric water heaters need far more power than lights or chargers. Labels or manuals show the wattage.
• Continuous vs peak power: some appliances use more electricity at startup than while running. Your generator must handle these brief surges.

How to choose the right size

Calculate the total wattage of everything you want to run at the same time, then add a safety margin so the generator can handle startup surges.

Portable vs whole-house generators

Portable generators are smaller and more affordable, can be moved and stored, and usually run on gasoline. They can power basic appliances but may not run everything at once, and you must store fuel and set them up manually. Whole-house generators are larger, permanently installed, and connected to your electrical system, often running on natural gas or propane. They start automatically when the power goes out for seamless backup, though they cost more to install and maintain. If you only need essentials, a portable unit may suffice; for comprehensive whole-home coverage, a whole-house generator is usually the better option.

A quick buying guide

Choosing the right generator size is essential to reliable power during outages. Understand your needs, add a safety margin, and decide between portable and whole-house coverage. A&A GenPro's certified professionals bring years of experience and quality service to Houston-area customers. Call (713) 715-6618 or request a free quote for help with your generator questions.