How Much Does It Cost to Install a Generac Generator?
The Average Cost of Installing a Generator
What is the Best Size for My House?
Why is Working with a Professional Important?
How Are Professionals Insured and Licensed?
- According to Lawes, the national average cost of a Generac generator installation is approximately $3,000-$13,000.
- The total cost will vary based on how much power output you need, as well as what type of features you decide to include in your installation.
- It’s estimated that an average 7 kilowatt (7kW) home backup standby generator costs about $4,200 for just the unit and installation.

What is the Brand of Generator You Choose?
What Features Should You Look for?
The Cost of Your Generator Purchase



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Appliance Wattage Guide
Appliance/Equipment | Running Wattage |
---|---|
Refrigerator/Freezer | 600 – 800 |
Electric Range (one element) | 2500 |
Toaster | 1100 – 1700 |
Microwave | 1200 |
Hot Plate | 1250 |
Coffeemaker | 400 – 800 |
Electric Oven | 5000 |
Television | 100 – 350 |
Personal Computer | 500 – 2000 |
Hair Dryer | 1200 – 1500 |
Vacuum | 700 – 1400 |
Space Heater | 1250 |
Table Lamp | 150 |
Electric Furnace | 5000 – 25000 |
Heater (radiant) | 1300 |
Central Air Conditioning | 2000 – 4000 |
Water Heater | 3000 – 4500 |
Water Pump | 1000 – 2000 |
Window Air Conditioner | 600 – 1500 |
Outdoor Lighting | 500 – 1000 |
Sump Pump | 1500 |
How to Calculate the Total Wattage You Need for a Generator:
- Make a list of all the appliances and systems you want to power with your generator.
- Look up the running wattage for each item on your list. If you have the manuals for your appliances and systems, this information should be listed there. If not, you may be able to find the wattage information online.
- If any of the appliances on your list have motors (e.g. a refrigerator, air conditioner, or washing machine), you will need to calculate the starting wattage as well. To do this, use the formula: Running wattage (R) + Starting wattage (R x 3) = Total wattage needed. For example, if your refrigerator has a running wattage of 600 and a starting wattage of 1800 (600 x 3), you will need a total of 2400 watts to power it.
- Once you have the running wattage and starting wattage (if applicable) for all of the appliances and systems on your list, add them up to get the total wattage needed.
- Choose a generator that is rated for at least the total wattage needed. If you plan to use multiple appliances at the same time, you may want to choose a generator with a slightly higher wattage rating to ensure that you have enough power.
Example:
Here is an example of how to use this process to determine the total wattage needed for a generator:
- List of items to power: Refrigerator (running wattage 600, starting wattage 1800), microwave (running wattage 1200), television (running wattage 150), and a few light bulbs (running wattage 60 each).
- Running wattage for each item: Refrigerator 600, microwave 1200, television 150, light bulbs (60 x 4) 240.
- Starting wattage for the refrigerator: 600 + (600 x 3) = 2400.
- Total wattage needed: 600 + 1200 + 150 + 240 + 2400 = 4590 watts.
- Choose a generator that is rated for at least 4590 watts, or slightly higher if you plan to use multiple appliances at the same time.
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