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Avatar for Invictus Electric Service Company, LLC
Invictus Electric Service Company, LLC
4.7(
25
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+3 more

Serving Hermitage, TN and surrounding areas

Approved

Super Service Award Winner

In business since 2021

Free estimates

Emergency services offered

"David has done several jobs for us and we have been really happy with his work and would recommend him. He did all the electrical work on a new garage we built, this was a big job. He pulled the permits, ran a new line, installed a new panel, installed lighting and switches. He also completed the wiring and lighting for a remodel we did. Would hire him again, he’s nice guy and does good work."
Electrical Project
Electric Vehicle Charger Install
Electric Vehicle Charger Install
Electrical Project
Electrical Project

+63

Response time1 day
Response rate100%
4 neighbors recently requested a quote
Avatar for Top Notch Electrical Group llc
Top Notch Electrical Group llc
5.0(
5
)
Fixed Generator - InstallPortable Generator - InstallFixed Generator - Repair+1 more

Serving Hermitage, TN and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"This is definitely the guy to hire if you need any electrical work done! He was kind and exceptionally professional. It was supposed to be a simple ceiling fan replacement. However, Larry found a serious problem with my wiring that I'm blessed didn't actually cause a fire in my home. He showed me the problem and fixed it even though that really should have been a separate call. I am over the top pleased with the service and work performance. I HIGHLY recommend Top Notch Electrical and Larry!!! 5 STARS!!!"
New panel upgrade
30 neighbors recently requested a quote
Avatar for Sensible Home Services LLC
Sensible Home Services LLC
5.0(
16
)
Portable Generator - Install

Serving Hermitage, TN and surrounding areas

Approved

In business since 2012

Free estimates

Emergency services offered

"Michael and his team were professionals and solved our electrical issues quickly and affordably. They were kind and trustworthy. I'll be certain, hands down, to call them when I need any electrical services performed in the future!! I'd recommend them to my friends! If anyone is looking for an experienced, knowledgeable, friendly, kind, and trustworthy team...call them right away, you'll be satisfied with the results and your experience!"
Lighting Upgrade
Lighting Upgrade
Lighting Upgrade
Lighting Upgrade
Lighting Upgrade

+19

Avatar for On Site Industrial Electrical LLC
On Site Industrial Electrical LLC
4.2(
13
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+2 more

Serving Hermitage, TN and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

"These young men took the inner working of the main electrical power distribution center of my house loose. Dismantled the connections and removed the panel, installed A new panel box, installed all the proper breaker and connected the wiring back in the right order. All in all an amazing feat to be completed in the time in was done. Puled up to the house at 7 in the morning and by 1:30 early the same afternoon power shut off to the house, MDP (main distribution Panel) and all associated hardware switched over, inspected and approved by State Electrical Inspector, and power restored. WOW. This company is about a year old and the young man that owns it is old school. His thinking is simple and straight forward. If I need work done and I'm in the area, one decision will be easy to make.
"
1 neighbors recently requested a quote
Recommended by15%of homeowners
Tyler Lauria
5.0(
5
)
Fixed Generator - InstallPortable Generator - Install

Serving Hermitage, TN and surrounding areas

Approved

Free estimates

Emergency services offered

Small jobs welcome

"Tyler installed an EV charger in my garage. He was very professional and kept me informed from first contact of arrival time and stuck to it or made me aware of any delays. He was meticulous in his work and stayed late into the night until the job was done. I will hire him again in the future for my electrical needs."
53 neighbors recently requested a quote
Avatar for M & M Electric & Mechanical LLC
M & M Electric & Mechanical LLC
4.1(
13
)
Fixed Generator - InstallGenerator - Install - For Business

Serving Hermitage, TN and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"It would be very difficult, if not impossible to find another company that has the commitment to excellence that M&M Electric has. I had them put in new central heating and air in my house and was surprised at how quickly they installed everything while still maintaining a high quality standard and while paying attention to every detail. Very impressive considering what they charged for the install was way less than what I was expecting to pay. I will definitely keep their number handy for any other jobs that pop up."
Gas Lanterns
Wine Room Chiller
Townhomes
Brewery Steam Removal
Rooftop Install

+2

Response time9 hrs
Response rate98%
Recommended by75%of homeowners
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Generator Install questions, answered by experts

Generators are usually sized by running watts and starting watts. Ideally, you’ll want a generator that can offer both the necessary running watts and starting watts for everything you need to power without going beyond 90% of its capacity. Calculate your home’s electrical load based on the breakers in your home or adding up the appliance and lighting needs of connected rooms.

Portable generators provide backup power for essential appliances during outages and are easy to relocate.

Yes, in some locations, it is required by the National Electric Code (NEC) to have a transfer switch installed for electrical emergencies. In addition to following electrical code, generator transfer switches ensure your home is fully protected during a power outage. By switching the power from the main breaker to the generator breaker, you can seamlessly operate your HVAC, lights, appliances, devices, and more during an emergency. 

The average cost to install a home generator is $5,200, but total costs can range from $500 to $18,000 or more. The final price depends on several factors, including the generator's size, type, brand, fuel source, and the cost of labor and assembly. The generator's size is the most significant cost factor, as units that can power larger homes with higher energy demands cost more.

Cost breakdowns by generator type are typically as follows:

  • Portable or Emergency Backup Generators (1kW–7.5kW): $500–$2,000

  • Partial-Home Generators (9kW–20kW): $2,000–$6,500

  • Whole-House Generators (22kW–48kW): $5,000–$18,000

To ensure you get the right size unit for your needs without overpaying, consider hiring an electrician to calculate the electrical load of your essential appliances. It is also recommended to get at least three quotes from qualified installers to find the best fit for your budget.

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.

The Hermitage, TN homeowners’ guide to generator installs

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