How do I correctly size a generator for my 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. What would your family miss during an outage?

With the broadest product line available, essential circuit coverage starts with the economically priced Generac CorePower™ Series. Other systems are available to cover virtually any application:

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. For example, ten circuits are supplied for the 8 kW generator. With this system, you could connect (1) lights and TV in the family room, (2) microwave and lights in the kitchen, (3) refrigerator, (4) power to the bathroom, (5) computer and home office, (6) garage door opener, (7) air conditioner, and (8) furnace.

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 Nexus™ load shedding switch 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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Visitor Comments

  1. Comment #1 (Posted by Ken Pugh )
    Searching for a backup generator. Our home is 2,800 sq ft, electric stove, hot water heater and 2 large and one small centeral heating/cooling system. During the month of August we average 3,000 KW used, but the monthly yearly average is less than 2,000 KW's. I can email a 6 year history of monthly usage if needed. I do not know what size back up generator to spec out. Thanks for any help
  2. Comment #2 (Posted by Anonymous)
    Ken - you will want to contact your electrician or if you do not have someone that will be installing the generator for you we can provide you with some names and numbers of certified installers in your area. They would need to come and look at your electrical situation, see what you want to run with the generator and then help you make the decision on which generator is the right size for you. They will also let you know which transfer switch is needed to install the generator.
  3. Comment #3 (Posted by John )
    is there a formula to go by

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Last Updated
19th of May, 2011

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