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Avatar for Mr. Electric of Huntsville
Mr. Electric of Huntsville
4.5(
95
)
Fixed Generator - InstallFixed Generator - Repair

Serving Boaz, AL and surrounding areas

Approved

In business since 2001

Free estimates

Emergency services offered

"This was the first time I used Home Advisor to find a contractor. Home Advisor linked me with Mr. Electric who did an outstanding job. They were on time, on budget, courteous, professional, and totally a pleasure to work with. Thomas installed a 50 and 30 amp service for us at our property servicing two RV lots as well as installed a power pole with a meter box for the power company to tie into. Jan was a pleasure to work with as she was the voice for the company dealing from everything from scheduling to invoice as well as general questions. Jan was very pleaseant and professional. We will use Mr. Electric in the future and highly recommend their service..."
EV Charger Install
EV Charger Install
Electrical Upgrade in Home Shop
panel upgrade
panel upgrade

+15

38 neighbors recently requested a quote
Recommended by84%of homeowners
Avatar for APS Lighting and Electrical LLC
APS Lighting and Electrical LLC
5.0(
5
)
Fixed Generator - Install

Serving Boaz, AL and surrounding areas

Approved

In business since 2023

Free estimates

Credit card accepted

"This is our go to electrical contractor for all of our commerical projects. They communicate clearly, arrive on time, and complete everything efficiently and professionally with quality always in mind. Their attention to detail and reliability always help the projects to run smoothly. Can’t recommend them enough for whatever you need done!"
28 neighbors recently requested a quote
Avatar for Coolray Heating, Cooling, Plumbing and Electrical
Coolray Heating, Cooling, Plumbing and Electrical
4.2(
23
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install+4 more

Serving Boaz, AL and surrounding areas

In business since 1966

Free estimates

Emergency services offered

"My installer Samuel was top notch, very detailed, pleasant, answered all my questions. Excellent representative. The only problem I had was miscommunication on their end as I was told available payment options and Samuel was told another. Did not affect installation or quality of work at all."
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Recommended by45%of homeowners
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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.

The amount of time a standby generator can run continuously is around 3,000 hours on average. However, standby generators can generally run indefinitely as long as they have a continuous fuel supply. Generators hooked up to a home’s natural gas supply are the best option for extended usage, as these won’t rely on a finite fuel supply based on how much you have in storage. Generators running on liquid propane or diesel won’t last as long, as these require fuel storage and regular refueling to stay running.

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. 

It is safe to run a generator continuously, but you must follow safety protocols to ensure personal and home safety. Read the manufacturer’s instructions for specific recommendations, but the general recommendation is to turn generators off overnight or when you’re away from the house. Overworked generators can pose a fire hazard and if your generator is not in a well-ventilated area, running it continuously could lead to carbon monoxide poisoning.

While the rating will tell you how many watts the refrigerator needs at the peak of its cycle, it requires additional wattage to start. At the bare minimum, you’ll need a 1,500-watt generator to get the fridge up and running after a blackout. A 2,000-watt generator should be sufficient for most home refrigerators.

The Boaz, AL homeowners’ guide to generator installs

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