Independent Wisconsin solar experts since 2002
Solar, managed with purpose.
Full Spectrum Solar is a family-owned Wisconsin company built around engineering, craftsmanship, clear guidance, and support that continues long after installation.
01 Our History
Built in Wisconsin for the long haul.
What began with two engineers and a belief in better solar work has grown into a multidisciplinary team serving homeowners, businesses, public agencies, and community organizations.
Our story has always been about doing careful work, explaining it clearly, and standing behind the result.
Brothers and UW–Madison mechanical engineering alumni Burke and Mark O'Neal founded Full Spectrum Solar in August 2002. Burke had returned from work as a lead engineer with a large California solar company, and the brothers saw an opportunity to build a Wisconsin solar contractor around engineering, quality, and long-term customer support.
Today, our team includes mechanical and electrical engineers, master and journeyman electricians, NABCEP-certified professionals, experienced roofers, project managers, and service staff. Together, we guide projects from early feasibility through design, permitting, installation, commissioning, and long-term support.
Our work spans homes, businesses, apartments, schools, public facilities, nonprofits, and community projects across southern Wisconsin—each approached with the same attention to long-term performance.
Full Spectrum Solar is founded
Burke and Mark O'Neal establish a Wisconsin solar company grounded in engineering, high-quality installation, and dependable customer service.
Madison headquarters earns top marks
Our zero-energy-cost office and shop receives an ENERGY STAR 100/100 rating—the highest rating in Wisconsin and better than 99% of comparable buildings.
A complete renewable-energy team
More than 1,500 systems and 28 MW later, our Madison and Waukesha teams continue to design, build, support, and service renewable-energy projects across the region.
02 Our Project Managers
clear guidance & direct communication.
Your project manager is not simply a handoff between sales and construction. They are a knowledgeable, accountable point of contact who helps define the project, surface constraints, and keep decisions moving.
Ron Chester
With more than 10 years of project management experience, Ron combines leadership, strategy, and clear execution. He holds an MBA and the CAPM® credential and enjoys helping homeowners understand solar, storage, and the decisions behind a successful project.
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Brent Janssen
With a degree in architecture and a minor in civil engineering, Brent brings a strong construction perspective to each project. He has designed and managed more than 250 installations, from homes and offices to warehouses and public facilities.
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Ted Gundlach
Ted has managed more than 125 solar projects, including multifamily housing, healthcare, recreation, and office facilities totaling over 2 MW. His collaborative, data-driven approach keeps technical requirements and project stakeholders aligned.
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Deiter Dettling
Deiter brings more than 20 years of experience across nonprofit and for-profit work with an environmental focus on sustainability and recycling. He has managed more than 150 residential, agricultural, business, and nonprofit projects to completion.
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Nick Aikens
With an electrical engineering background and a practical approach to energy use, Nick blends design and equipment choices to serve each project's real needs. He is glad to discuss technical questions and solutions for both solar and heat pumps.
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Greg Sanden
Greg brings more than 25 years of engineering management experience, with an emphasis on planning, communication, and follow-through. His Six Sigma Black Belt background supports a practical process while keeping each customer's goals at the center of the work.
Email Greg03 Our Mission
Education first. No pressure.
Solar should be understood before it is purchased. We start by helping each customer understand what solar can do, what it cannot do, and how design, utility rules, electrical infrastructure, batteries, incentives, and energy use affect the outcome. The aim is an informed decision—not simply a sales decision.
Quality project management is more than presenting an appealing idea. It means identifying the challenges that can shape a project—roof condition, shading, structural and electrical needs, utility interconnection, equipment compatibility, permitting, schedules, and future service—then addressing those issues honestly and early.
When a challenge can be resolved, we build the solution into the plan. When it cannot be resolved cleanly, we say so. That is how we protect the customer's investment and the long-term performance of the system.
A good solar conversation should leave you better informed, whether or not you move forward.
Explain the tradeoffs
We translate design, equipment, utility policy, production, and financial assumptions into clear choices.
Find obstacles early
Strong planning identifies project constraints before they become costly surprises in construction.
Own the follow-through
A dedicated team remains accountable through design, permitting, installation, commissioning, and service.
Start with a conversation
Tell us what you are trying to accomplish.
We will help you understand the options, the tradeoffs, and the next useful step for your property.