What Size Generator Do I Need For My Home?

It's easiest to determine what home backup generator system is right for your household by first thinking about what household items your family wants to remain functioning normally during a power outage. The number of home appliances or electrical loads you want to power will determine the size and cost of the residential generator.

Choose what appliances you want your generator to power

TIP: Essential appliances typically include: Furnace, Sump Pump, Garage Door Opener, Lights

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Based on the quantity and type of appliances you have selected, we configured the wattage needed to power all of them at one time.

Using your selected wattage, we built in a 20% buffer in case you have more items to power.

When wattage needed is low enough a portable generator might be a better suited and cost effective power product

What fuel type powers your home currently?


Types of Home Generators

There are generally three different types of standby generators, which vary based on how much your home needs to power:

Select Circuit Home Generators: Power Essential Appliances
A select-circuit generator system is a cost-effective way to power your home’s basics to get you comfortably through a power outage. These units can power up to 10 electrical loads in your home, including the fridge, some lights, television and the microwave. It’s a perfect small home generator solution.

Managed Whole-House Power Generators: Smaller, More Power
Equipped with the smartest Power Management system available, Symphony® II Power Management, these backup power solutions give your family the benefits of whole-house power with a smaller, more affordable generator system. With the innovative power of Symphony II, these home generator systems can manage to power all of your electrical needs — including up to two air conditioners.

Whole-House Generators for Maximum Backup Power Needs
Whole-house standby generator options are the best backup power solution for extra-large and luxury homes. They power an array of high wattage appliances – from double ovens to hot tubs – with the performance you could expect from commercial generators.

Home Standby Generator Sizing Calculator (Choose Applications and Fuel)

With the Home Generator Sizing Calculator above, you can determine the best size and type of generator for your home.


Propane vs. Natural Gas Home Generators

For residential use, generators run on either natural gas or liquid propane. Natural gas can keep your generator running for weeks, while liquid propane will keep power for several days. Generators produce more power while operating on liquid propane as the fuel supply is limited depending upon the size of the storage tank. If buying a larger generator and using liquid propane as the fuel source, it is recommended to increase the size of the fuel tank to ensure lasting power for more than a few days.

Natural Gas (NG)

  • Offers virtually endless supply of fuel
  • If available in your municipality, natural gas can be added to your home

Liquid Propane (LP)

  • May need the propane tank refilled at some point due to normal usage depending upon the size of the tank and the requirements of the generator
  • If you already have a LP tank, it may need to be sized up to power our standby generator
  • LP is typical in rural areas where natural gas is not available

Most homes can operate equally well on either fuel source type, but it depends what the home has to offer. Natural gas is supplied by the municipality through the existing infrastructure or you are responsible for having a propane tank and piping installed on the property.


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