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Full Spectrum Solar - Profile & Reviews

U.W. Madison mechanical engineering alumni, Burke and Mark O'Neal, started Full Spectrum Solar in August 2002. Burke had returned from his position as a lead engineer with one of the largest California solar energy companies at that time, and with Mark, they envisioned building an environmentally friendly contractor that would install the best quality photovoltaic systems possible, with unmatched customer service and at a competitive price.

Today, Full Spectrum Solar is one of the most highly-credentialed solar energy contractors in the Midwest. Among our experienced staff, we have degreed mechanical and electrical engineers, with over 40 years of combined renewable energy experience between them. Our staff includes master electricians, two with over 15 years of photovoltaic installation experience, journeyman-level electricians, NABCEP-Certified Installers, and solar-experienced roofers.

We are proud of our zero-energy-cost office and shop on East Washington Ave and our energy-efficient vehicles, including three electric vehicles. In early 2013, our office and shop was awarded an ENERGY STAR 100/100 rating. That’s the highest rating in Wisconsin; better than 99 percent of comparable buildings!

Our team has installed over 800 of the finest quality solar energy systems in southern WI, for homes, apartments, and a wide variety of businesses and non-profits. Our most visible projects include Forest Edge Elementary School, Dane County Job Center, Willy Street Grocery Co-op, Troy Gardens Co-housing, and Holy Wisdom Monastery in Dane County; the Milwaukee Recycling Center in Milwaukee; Organic Valley Cooperative in La Farge; Evansville Community Pool in Evansville; and Dominican Eco-Justice Center in Racine.

2 reviews

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  • "Top-notch solar and EV charger installer"

    "Top-notch solar and EV charger installer"

    Reviewed Jun 24, 2021

    I've used Full Spectrum on three separate occasions: (1) a solar array, (2) an expansion of the solar array a year later, and (3) the installation of two EV chargers. The Full Spectrum engineer and electricians that I worked with were awesome. I am very happy with my SunPower solar system; it has worked perfectly!

  • "Shining through Covid"

    Reviewed Jun 09, 2021

    The challenges were many. Both, myself and Full Spectrum failed at finding a electrical contractor to upgrade my electrical panel for my proposed larger array. Full Spectrum agreed to, and stepped up to do the upgrade, so we could go forward. The electrical supplier ordered a uncommon size main breaker for us. It was a 6 week wait because of Covid shortages.

    The power company disconnected the power for the electrical panel upgrade. While installing the upgraded panel, it was discovered, after a 6 week wait, the supplier gave Full Spectrum the wrong size and incompatible Main breaker. In order to get my power back on, the electrician, volunteered a compatible Main breaker from her home rewiring project. My Full Specrum project manager left his office, went to the electricians home, removed the breaker from her panel, brought it to my home. So they could keep working to get my power back on.
    The Covid and non-Covid issues continued like any addon, Full Spectrum kept stepping up, on budget.
    I would hire them again.

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We provide excellent customer service and install the best photovoltaic systems available at a competitive price. Instead of a commissioned salesperson, you will work with a skilled and experienced project manager to arrive at the right system for your needs, who will guide the project from contract to commissioning. Established in Madison in 2002, we will be here if you ever need warranty support or want to expand your system.

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Full Spectrum Solar Headquarters

1240 E Washington Ave
Madison, WI
53703 United States

Local Offices (1)

  • 3000 Hubertus Rd
    Hubertus, WI 53033

Workmanship Warranty

5 year workmanship warranty covering any defects in our work or problems caused by our work, in addition to the manufacturers' warranties.


Dane County Small Business Award, Midwest Renewable Energy Association, RENEW WI, Energy Star, Dane Buy Local, Bicycle Friendly Business Award, Green Masters, MPowering Champion


Full Spectrum Solar holds Design and Installation Certificates from the National Accredited Board of Certified Energy Practitioners (NABCEP), Solar Energy International, SMA Industries, Fronius, Enphase Energy, Generac, and the Midwest Renewable Energy Association.


Master Electrician #908748, #1080240
Journeyman Electrician #1485055, #1012013
Electrical Contractor License #1055530
General Contractor License #1055530
HVAC Contractor License #1055530


$1,000,000 liability insurance, worker's compensation, errors and omissions coverage, vehicle coverage through Acuity Insurance Company

States served by Full Spectrum Solar

  • Wisconsin WI

Languages spoken by Full Spectrum Solar