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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!!"
25 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 Tison Inc
Tison Inc
4.3(
32
)
Fixed Generator - InstallPortable Generator - InstallGenerator - Install+1 more

Serving Fleming Island, FL and surrounding areas

Approved

Super Service Award Winner

In business since 2008

Free estimates

Emergency services offered

"Chris Ayarza came in and completed the job perfectly, even helped with assisting on a couple electrical jobs I had planned to take on myself. When the job was completed, I noticed the AC stopped blowing cold air but they came in next day to finish up with labeling our new panel and also spent some time to fix the issue. Overall great experience and learned some new tricks too"
Electrical Project
Home automation
Home theater
Outdoor grill, and outdoor theater
Home automation

+5

Response time1 day
Response rate100%
77 neighbors recently requested a quote
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

Whole-house generators can run continuously for extended periods, even for weeks at a time (around 400 to 500 hours), as long as they have a sufficient fuel supply. However, this type of extensive use will increase wear and tear and can shorten the generator's overall lifespan. During long periods of operation, it's important to check and refill the engine oil as needed, potentially as frequently as daily depending on the model. If your generator uses a fuel tank, ensure it is kept full to prevent unexpected shutdowns.

You may need a permit for a portable generator if you’ll be installing a transfer switch for your primary residence or similar work. Otherwise, a permit for other uses may not be necessary. Check your local building codes or ask a local generator installer for more information about your local regulations.

No, you should never plug a generator directly into a wall outlet in your house. This practice is extremely dangerous, often illegal, and can cause "back-feeding," where power from the generator flows back into utility lines, creating a life-threatening hazard for utility workers. It can also damage your home's electrical system, including appliances like pumps and HVAC fans. If the main power is restored while the generator is connected, it can destroy the generator and cause an electrical fire. To safely connect a generator, you must use a professionally installed transfer switch or an interlocking kit, which prevents back-feeding by disconnecting your home from the utility grid before the generator provides power.

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.

To power a central air system during a power outage, the whole-house generator will need to be at least 5,000 watts, and this number will significantly increase for larger units. Check the specific wattage requirements of your AC unit to choose the right generator size. Consider consulting a generator installer to ensure your whole-house generator meets your electrical load needs.

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.