Note: Generac customer support cannot size generators because we are not physically onsite to inspect the application, calculate load size, and are not familiar with your local applicable codes. Similarly, we cannot size wiring because we are not on-site to inspect the application, nor are we familiar with any applicable local codes. Work with an Authorized Independent Service Dealer to install a generator.
 

Sizing a Generator for a Home

The most logical way to determine your needs is to envision your home without power. Some outages may be short in duration, while others could last for days or weeks. Use the solution finder on Generac.com to find the right size generator for your needs.

The best way to understand your options and work within your budget is to schedule a free in-home assessment. During your consultation, you will receive the personalized attention and detailed evaluation you need to find a solution that works for your need.
 

• Essential Circuit Coverage – Generac takes the guesswork out of sizing by offering prepackaged Guardian Series generator systems. The generator is paired with a transfer switch containing a predetermined number of circuits based on the generator’s kW power rating. Each circuit is directly connected to a matched circuit on the home’s main circuit breaker panel, providing electricity to that specific appliance or area of the home.
• Managed Whole House Coverage – You can get more coverage with less generator, up to whole-house coverage, by pairing a smaller generator with one of Generac’s load-shedding options. This creates a managed power solution where non-essential circuits are shed when the generator approaches maximum capacity. They are cycled back on when essential circuits no longer require power, so all circuits receive power at different times.
• Complete Whole House Coverage – Easily cover every circuit in your home by pairing one of Generac’s larger kW units and the proper transfer switch to provide full coverage. No circuit is ever left uncovered, so every appliance is available every minute.

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Can I size a generator using only the square footage of my house?

Sizing a home standby generator is about electrical load, not square footage. Add up the running watts (and any starting watts) for the appliances and systems you want powered during an outage to estimate the total. Because this can be complex, schedule a free, no-obligation in-home consultation with a Generac dealer. They’ll assess your needs, review options, and provide a customized total-solution estimate. To learn more about home standby generator installation and to obtain a free estimate, see here: https://www.generac.com/prepare/installation/

 

See also

• Can I install my own home standby generator?