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    Average homeowner rating
  • Verified reviews icon26
    Verified generator installs reviews

Find Generator install pros in Derby

Avatar for Frank's Generator Sales Service & Repair
Frank's Generator Sales Service & Repair
5.0(
21
)
Fixed Generator - InstallFixed Generator - RepairPortable Generator - Install+4 more

Serving Derby, CT and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"10 yr old Generac GP6500E wouldn’t start. Called around and many want to upsell to permanent. Found Franks and what a delight. Honest, down to earth, affordable for senior. Showed up on time. Changed oil, spark plug. Pulled carburetor and found it dirty and fouled. Got used one from his shop(same day) and installed. Gen started right up on one or two pulls. Battery was dead but showed us how to replace. Highly recommend Frank’s Generator."
Generator emergency service call
Generator Project
Generator Service
Generator emergency service call
Generator Project

+29

Response time2 days
17 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for Power Forward, LLC
Power Forward, LLC
4.9(
19
)
Fixed Generator - InstallPortable Generator - Install

Serving Derby, CT and surrounding areas

Approved

In business since 2017

Free estimates

Credit card accepted

"Ian was able to schedule me within 24 hrs of contact. Corrected my wiring problem and installed new fixture efficiently, even fixed a noise problem with unit (range hood) Answered my many questions thoroughly. Being new to area it was a great find Would definitely recommend."
Broken driveway lights
Front walk way post light
Response time3 hrs
Recommended by100%of homeowners
Avatar for Firemans Services LLC
Firemans Services LLC
5.0(
4
)
Portable Generator - Repair

Serving Derby, CT and surrounding areas

Approved

Free estimates

Emergency services offered

Warranties offered

Firemans Services LLC is a trusted, locally owned electrical contracting company dedicated to delivering safe, reliable, and high-quality electrical solutions. We specialize in residential and light commercial work, including service upgrades, panel replacements, generator installations, and custom electrical projects.\n\nWith a strong commitment to craftsmanship and customer satisfaction, our team takes pride in doing the job right the first time—on schedule and within budget. Whether you need a full service upgrade, backup power solutions, or everyday electrical repairs, Firemans Services LLC is your dependable choice for professional service you can count on.

Meter
Tesla Charger
Avatar for Equipment Unlimited
Equipment Unlimited
4.6(
21
)
Fixed Generator - InstallPortable Generator - Install

Serving Derby, CT and surrounding areas

Approved

In business since 1997

Free estimates

Emergency services offered

"Incredible experience. Matt and Miseal came to my 1960s era condo in rural CT to do an assessment of what I wanted. Matt (a veritable genius) recommended in order to save time (labor $) and to help bring my aging condo into the 20th century, to install the new Lutron Caseta system. Turns out, it’s Alexa, Google, and Apple compatible, in addition to just being wireless. Over the decades, Ive wired outlets, switches, ceiling fans, and fixtures of all types many, many times. This system is light years ahead of “old school”. With a simple Echo Dot or Echo Show and the affordably priced Caseta bridge, even my adult son could easily control my lighting and ceiling fans from his house or anywhere in the world. Incredulous! This system actually becomes part of your environment, so to speak. Anyhow, I got the quote a day or so later from Equipment Unlimited and was “dead nuts” right where I thought it would be and thought was reasonable. 1 week later, everything is done, working perfectly, not a single glitch. Again… incredulous. Matt and Miseal were neat and tidy, which was great because their working with me there did not ignite my OCD. Cleaned and used a tarp as they went from one area to another. If you’re looking to electrically update your home, consider yourself freaking lucky if you get Matt and Miseal. Personable, clean, on time, reasonable and yes, even a sense of humor; a rarity among electricians. EXCELLENT JOB, Matt and Miseal from Equipment Unlimited. You made this old swamp yankee a very happy guy."
pendants
under cab
under cab1
new kitchen
kitchen lights

+10

Response time5 hrs
8 neighbors recently requested a quote
Recommended by95%of homeowners
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Generator Install questions, answered by experts

As a safety measure, you should always turn off the main breaker while operating your generator’s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.

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. 

A home that is 2,500 square feet will likely need a 20kW to 25kW generator. Consult your local generator installer to confirm the generator size needed to power your home before purchasing a new one. Be sure to consider how much power your necessary devices need to run.

Energy output depends on turbine size, average wind speed at your site, and system efficiency. A 5 kW turbine in a good wind location can generate 8,000 to 12,000 kilowatt-hours per year, which may cover a large portion of an average home’s needs. Accurate output estimates require a professional wind assessment and a review of your household’s energy usage patterns.

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 Derby, CT homeowners’ guide to generator installs

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