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Avatar for Colson's Electrical Services LLC
Colson's Electrical Services LLC
5.0(
29
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+1 more

Serving Fleming Island, FL and surrounding areas

Approved

In business since 2018

Free estimates

Warranties offered

"William was prompt, set expectations and followed through and educated us on the need for a Surge Protector. He came for a quote but was able to install the EV charger quickly and cleanly same day. He is very knowledgeable about the EV market and was in and out quickly. Great experience all around. Highly recommend!!"
26 neighbors recently requested a quote
Power & Control Installations, Inc.
4.3(
181
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Fleming Island, FL and surrounding areas

Approved

In business since 2005

Free estimates

Credit card accepted

"Actually, Power and Control Installations did much more than install electrical switches, outlets and fixtures. They installed a new 20 amp breaker, and ran wiring 60 feet underground to my new shed. The electrician they sent out was very professional, courteous, and answered all my questions. The work was completed to my satisfaction. I would highly recommend this company to others."
Response time1 day
Response rate91%
13 neighbors recently requested a quote
Avatar for Bill Fenwick Plumbing, Inc.
Bill Fenwick Plumbing, Inc.
4.5(
789
)
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Install+1 more

Serving Fleming Island, FL and surrounding areas

Approved

In business since 1969

Free estimates

Emergency services offered

Bill Fenwick Plumbing, Inc. is a Jacksonville, Florida, business that has been offering service to its customers for 40 years. We are a customer-oriented company that arrives on time, uses only quality parts and does the work right the first time.\n\nWe value your opinion and realize that you may have additional questions. Please take a moment to complete our form for more information, quotes, or appointments, and someone from our staff will contact you as soon as possible.

Recommended by88%of homeowners
Avatar for Howard Electrical Services Inc.
Howard Electrical Services Inc.
4.1(
35
)
Fixed Generator - Install

Serving Fleming Island, FL and surrounding areas

Approved

In business since 2007

Free estimates

Emergency services offered

"I'm blown away by the fantastic service. I was trying to get ready for Hurricane Matthew and needed a generator outlet installed. Called and got a call back immediately. Ken was great to work with, installed the outlet while I had to head out of town. I was extremely worried about the hurricane and Ken's was so helpful that I knew we'd have what we needed when the storm hit. He even checked our old cable and suggested that we buy a new one, stayed on the phone with my wife to make sure the right one was ordered. I can't say thank you enough. This is why you deal with highly reputable local companies, they go the extra mile. Highly recommend them without reservation."
Specialty light
New Construction
Kitchen
Family Room
6 neighbors recently requested a quote
Recommended by92%of homeowners
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Generator Install questions, answered by experts

Sizing a generator is a careful process that requires calculating the electrical load of your entire house. You have to take into account every device you want to use and their wattage requirements, plus the wattage needed to start them, and look for a generator that can safely run all that at around 80% capacity.

In more practical terms, a small home can run on a 10,000-watt generator (and if you only want to power a few key appliances, much less than that). A mid-sized home may need something between 15,000 and 22,000 watts. Larger homes require 25,000 watts or more. 

To determine the right size generator for your house, you should calculate the total wattage of the appliances and devices you want to power during an outage. List all essential items, note their start-up wattages, and add them together.

Here are some typical wattage requirements for common appliances:

  • Refrigerator: 600 watts

  • Large dehumidifier: 700 watts

  • Large window air conditioner: 1,400 watts

  • Water heater: 3,000 to 4,500 watts

  • Electric furnace: 5,000 to 25,000 watts

A 7,500-watt generator might be sufficient for essentials like a refrigerator, freezer, well pump, and lighting circuits. However, for high-demand items like a water heater or furnace, a whole-home generator is a better choice. A portable generator may be enough if you only need to power a few critical items.

While home square footage can offer a rough estimate, it is not always a reliable indicator. For reference, here are some typical generator sizes based on square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14 kW

  • 2,500 sq ft: 12–16 kW

  • 3,000 sq ft: 16–20 kW+

For the most accurate sizing, consult a professional who can calculate your home's peak and average power consumption and recommend the optimal generator.

Many services include assembling the unit and securing it in the window. Confirm with your provider.

A 10,000-watt generator can run a small to mid-sized central AC unit (typically up to 3 tons or 36,000 BTU) along with a few other appliances. However, larger AC units or additional loads will require a bigger generator. Consult a local generator installer to ensure you add the correct size generator to your home.

Generators are safe to use as long as they are installed and operated correctly according to the manufacturer's recommendations. The most critical safety tips are to never use a portable or fuel-powered generator inside an enclosed space due to the risk of lethal carbon monoxide poisoning; always operate it outdoors where fumes can dissipate away from your home. Additionally, never attempt to connect a generator to your home’s electrical panel yourself—hire a professional to ensure the setup meets safety standards. Finally, avoid overloading the generator by not connecting more appliances than it is rated for, as this can damage your equipment or cause a fire.

The Fleming Island, FL homeowners’ guide to generator installs

From average costs to expert advice, get all the answers you need to get your job done.