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Top-Rated Generator install pros in Sun Prairie - Updated Nov 2026

Avatar for Wisconsin Generators LLC
Wisconsin Generators LLC
5.0(
10
)
Fixed Generator - InstallGenerator - Install - For Business

Serving Sun Prairie, WI and surrounding areas

Approved

In business since 2023

Free estimates

Emergency services offered

"I cannot say enough great things about Jamie and the team at Wisconsin Generators LLC. From the very first conversation, Jamie was professional, knowledgeable, and incredibly responsive. He took the time to walk me through all my options, answered every question thoroughly, and made sure I felt confident in the decision we were making. The installation process was seamless. The crew showed up on time, worked efficiently, and treated our property with respect. Their attention to detail and commitment to doing the job right was obvious from start to finish. Everything was clean, organized, and completed exactly as promised. What really sets Jamie apart is his integrity and customer-first approach. There was no pressure just honest recommendations and clear communication. If you’re considering a standby generator, I highly recommend Jamie and Wisconsin Generators LLC. Reliable service, expert installation, and true peace of mind. Five stars all The way!!"
Whole house back up
Installation Trailer
New propane generator
Partial home backup
Partial home backup

+1

22 neighbors recently requested a quote
Avatar for Cardinal Heating & Air Conditioning
Cardinal Heating & Air Conditioning
4.8(
166
)
Fixed Generator - InstallFixed Generator - Repair

Serving Sun Prairie, WI and surrounding areas

Approved

In business since 1984

Free estimates

Emergency services offered

"I purchased a new HVAC system from Cardinal. Everything about the job went as planned, in the amount of time we were promised. The installers were professional and cleaned up the work space very well when they were finished. I would use Cardinal again without hesitation."
Cardinal Heating Air
Cardinal Heating Air
Cardinal Heating Air
Cardinal Heating Air
Cardinal Heating Air

+14

117 neighbors recently requested a quote
Recommended by89%of homeowners
Avatar for PRECISION POWER & ELECTRIC LLC
PRECISION POWER & ELECTRIC LLC
5.0(
10
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Sun Prairie, WI and surrounding areas

Approved

In business since 2024

Free estimates

Warranties offered

"How’s this? Full disclosure — I’m the proud parent of the guy behind Precision Power LLC, but I’d recommend Hunter even if I wasn’t! He’s a licensed Master Electrician who takes real pride in doing things the right way, not just the fast way. Hunter handled our new lighting and several electrical projects with professionalism, precision, and an eye for detail. He’s reliable, fair, and genuinely cares about his customers. If you want quality electrical work done right the first time, Precision Power LLC is the one to call."
Added cabinet lighting
Added cabinet lighting
Added cabinet lighting
Commercial work
Commercial work

+8

Response time4 hrs
Response rate100%
5 neighbors recently requested a quote
Avatar for All Comfort Services
All Comfort Services
5.0(
6
)
Fixed Generator - InstallGenerator - Install - For BusinessPortable Generator - Install

Serving Sun Prairie, WI and surrounding areas

Approved

In business since 1973

Free estimates

Emergency services offered

All Comfort Services is a 50+ year old employee-owned heating, cooling, plumbing, and electrical contractor serving residential and commercial customers in Dane and parts of Rock, Columbia, and Jefferson counties. We may need to confirm a specific zip code that we service. Our team understands that when you call a local electrician, you need a trained, certified, and insured professional who will arrive on time and be ready to provide the solutions you need. Our repair dispatch fee is $149.

Generator
Generator
Panel Installation
Service Upgrade
Avatar for Ls industrial repair
Ls industrial repair
5.0(
2
)
Portable Generator - Repair

Serving Sun Prairie, WI and surrounding areas

Approved

Free estimates

Small jobs welcome

Credit card accepted

"He showed up in a timely manner. He did the job quickly. There was a shorted wire that he had to re-run and pull through the existing pipe. So far it's all working great and has not needed to return. So far everything working great."
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Generator Install FAQs, answered by experts

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. 

Natural gas and electricity rates vary significantly based on location, and pricing can change over time, too. It’s possible that in locations where natural gas is particularly inexpensive, it will cost less than grid-based electricity will. However, you should also factor in the generator’s initial costs and maintenance needs, as well as its noise level and if it can comfortably power all your home appliances.

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.

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.

Here’s what you can run with different wattages and types of generators:

Portable generator:

  • 2,000 watts can handle a large appliance like a freezer or refrigerator, plus a few smaller items like phones or computer chargers. 

  • 4,000 watts will keep two large appliances operating and a few smaller devices.

  • 8,000 watts should power most essential appliances and other devices, including a sump pump, well pump, or your dishwasher.

Partial to whole-house generator:

  • 20,000 watts and above will make it seem like your home’s power is still on.

The Sun Prairie, WI homeowners’ guide to generator installs

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