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Avatar for Greens Electrical
Greens Electrical
5.0(
25
)

Serving Duncan, SC and surrounding areas

Approved

In business since 2000

Free estimates

Emergency services offered

"Mr. Green TRULY puts the customer first! He installed a whole house generator for me last August and called to check on us 6 months later because bad weather is coming. Brought me a key and showed me (again) how to add oil. I had several estimates and he beat other prices by several thousand $ AND he installed a bigger generator! I will definitely hire him again and recommend him to every one!! 5 star service *****!!"
Additional Photos
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+1

Response time1 day
7 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for Mr. Electric of Greer
Mr. Electric of Greer
4.9(
15
)

Serving Duncan, SC and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

"We were looking to have a generator installed, having several quotes already cody from mr electric came and walked me thru all my options getting me the best price with a better generator I also had my main panel replaced since it was original to our home. They did the job perfect cleaned up everything and weà  à ¢à  à  à  à  ve never been happier with their overall service 5 stars!"
Whole Home Generator
Kitchen remodel
Parking lot lighting
Panel install
Response time2 days
13 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for U.S. Energy Solutions
U.S. Energy Solutions
4.7(
74
)

Serving Duncan, SC and surrounding areas

Approved

In business since 2015

Warranties offered

Credit card accepted

"5 stars! Mark Chapman with US Energy Solutions just installed a manual transfer switch box for my portable generator. The work was done professionally, on time, and very reasonably priced. Mark tested the install before he finished and it was perfect the first time. He was knowledgeable and experienced. My next electrical project will start with a call to Mark!"
Horan Solar and Battery -Easley SC
Horan Solar and Battery -Easley SC
Horan Solar and Battery -Easley SC
Horan Solar and Battery -Easley SC
Horan Roof Installation 3rd day

+1

14 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for US Energy Solutions, LLC
US Energy Solutions, LLC
4.8(
146
)

Serving Duncan, SC and surrounding areas

Approved

In business since 2015

Free estimates

Credit card accepted

"Whole house Generator installation was neat and clean and the electricians, Forest and Kevin were personable, professional and did such a great job! Richard did a wonderful job communicating with us. Great Company! We highly recommend them!"
Roof Mounted Solar System
Solar Battery Energy Storage
Solar Battery Energy Storage
Heat Pump
Air Conditioning Unit

+6

Response time10 hrs
Response rate92%
1 neighbors recently requested a quote
Avatar for Surge Electrical Contractor, LLC
Surge Electrical Contractor, LLC
4.7(
19
)

Serving Duncan, SC and surrounding areas

Approved

In business since 2019

Free estimates

Warranties offered

"Serge and Reuben were very kind and professional. They showed up on time, managed the permits and inspections in record time. AND got the power company in my area on board in record time also! This in the middle of storm damage all over our town! When there were some issues with wiring (as there always is in a house built initially in 1940 and added to in no apparent plan, quirky but cool!) Serge explained them to me and we came up with a plan and though he could have, didn't charge me for the extra effort. We discussed some future projects as the remodel goes forward and he ran wires for them so it will be a go when we get there. I couldn't have asked for better service, better communication, better replacement equipment and better understanding when I wanted to change things on the fly. He will be my go to guy for all future projects and I would recommend him highly and plan to with everyone I know. He does commercial and residential and is truly a part of the pro family now"
Response time6 hrs
2 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Just Electric, LLC
Just Electric, LLC
4.6(
21
)

Serving Duncan, SC and surrounding areas

Approved

In business since 2000

Free estimates

Credit card accepted

"What a joy it is to recommend Pete and â  Just Electricâ  . To folks in need of electrical work and want reliable service! I needed a new light fixture installed as well as an inoperative wall switch. One call to Pete and he had a great team at my house working in no time. Job done quickly and to my wifeâ  s liking! Thanks Pete and your technicians! I recommend â  Just Electricâ  for any project!"
Response time6 hrs
Response rate85%
6 neighbors recently requested a quote
Avatar for Cerberus Electrical, LLC
Cerberus Electrical, LLC
5.0(
47
)

Serving Duncan, SC and surrounding areas

Approved

In business since 2022

Small jobs welcome

Credit card accepted

"Kevin with Cerberus did a fantastic job with our electrical with our remodel. We had 2 walls removed and an island and bathroom installed. He removed all the wiring with the old receptacles in the walls that were removed and he installed all new outlets in our kitchen and in the new island. He rewired all the switches to work with the new lights and cleaned everything up. He did a fantastic job, always on time and no issues."
Response time4 hrs
Response rate93%
Recommended by79%of homeowners
Avatar for Homeland Electric LLC
Homeland Electric LLC
5.0(
15
)

Serving Duncan, SC and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Credit card accepted

"Matthew installed a new sub panel box for us. His work was thorough and fast. The finished job looked great and worked perfectly. He also installed recess lighting for us. Again another job very well done. Not only is he reliable and does a great job but he's also personable and very kine. We highly recommend Matthew with Homeland Electric"
Response time9 hrs
5 neighbors recently requested a quote
Avatar for VoltX Electrical
VoltX Electrical
5.0(
6
)

Serving Duncan, SC and surrounding areas

Approved

Super Service Award Winner

In business since 2025

Free estimates

Offers commercial services

"VoltX is the premier electrical service provider in our area. I have worked with Andrew of VoltX for some time now and the work they do is nothing short of exceptional. From wiring my outdoor area at my home, to my business, to my complete home generator, each time has been a pleasure and I will continue to use their services in the future, as I have dozens of times in the past! If you re looking for electrical.. Call these guys!"
Mid install
Response time2 days
2 neighbors recently requested a quote
Showing 1-10 of 50
Generator Install questions, answered by experts

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.

Homeowners can often access federal tax credits, such as the Investment Tax Credit (ITC), which covers a percentage of installation costs. Many states and utilities offer additional rebates, grants, or performance-based incentives. These programs can significantly lower your upfront investment. Check the Database of State Incentives for Renewables and Efficiency (DSIRE) or contact your local energy office for current offers.

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.

Generally, you’ll want to keep between 60 and 70 feet between the generator and the transfer switch. There are a few reasons for this, including:

  • The distance reduces the noise coming from the generator into your home.

  • It increases efficiency because you won’t have a voltage drop from this short of a distance.

  • Prevents carbon monoxide poisoning: keep at least 15 feet between your generator and an open window. 

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.

The Duncan, SC homeowners’ guide to generator installs

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