Award Winning Services
How Full Spectrum Solar Became One of Wisconsin's Best
Full Spectrum Solar is a family owned and operated business that has been proudly serving Wisconsin for 20-years. Founded by brothers and UW-Madison Mechanical Engineering alumni, Burke and Mark have always strived to create a company culture that believes that the ethics of good business practice and contributing to the wellness of nature come first. We pride ourselves for how little we focus on marketing and instead believing that through great work and trust, our customers become our greatest supporters as a local small business.
We are a small business with an environmental mission which supports our emphasis on communication, service, and community connections.
Why Choose Full Spectrum Solar?
- 20+ Years of Solar Experience
- Direct Pricing with No Sales Pressure
- Industry Leading Warranty Coverage
- Smart Phone System Monitoring
- North American Products
- Certified Master Electricians
- Accredited Project Managers Dedicated to Each Project
- Post-Installation Service Department
Some Feedback
What Our Clients Say
EXCELLENT Based on 180 reviews Posted on Tyler Koerth Very personable staff. Very responsive. Great pricing compared to other companies in the surrounding area. No complaints about the product. Smooth process from permits, installation, through inspection. They even applied for a grant on my behalf and got some money off.Posted on schpinck schpinck The process was a breeze throughout. I'm now powering my home with solar and selling the excess.Posted on Scott Sauer I didn't really shop around for a solar provider. FSS has been on the scene for years, so I trusted that. They were quick and clean in the installation. Just wish I had taken this leap a few years earlier.Posted on Andrew Handeland We had a great experience with Full Spectrum Solar! The communication was excellent and the installation was smooth. They have also been very helpful with answering all of our questions. We are very happy we made the decision to hire them!Posted on Indrani Datta I had many options, but I went with Full Spectrum because of Dieter's clear and straightforward explanations. I was trying for the federal tax credits, but he was up front about their packed schedule. Full Spectrum was trustworthy, kept their timing promises, and offered fair warranties going forward. I love watching the solar energy accrue on my app and seeing the electricity spikes from stove/dryer, etc.Posted on David Johnson We chose Full Spectrum Solar to install an EV charger in our garage precisely because their installation of solar panels on our roof in 2018 has been such an unqualified success! Everyone at Full Spectrum Solar (Ron our project manager; Eliot & Tanner our install electricians) has been outstanding. They were respectful about our wishes to keep the basement footprint of wires and drilled holes minimized, and the charger is safely tucked away on a garage wall with easy access to our new EV. Can't say enough great things about this group....we trust them with all of our alternative energy needs!Posted on Joe Nelson We had a great experience with Full Spectrum Solar! Ron took advantage of our house's design and recommended an array to fully cover our south-facing garage roof. It's been very productive so far, and we're looking forward to see how well it does throughout the year! The install process was a breeze since everyone communicated well, from the electricians to the install crew. The system's functionality was explained well and we feel confident that it'll provide maintenance-free energy for many years to come. Excited to work with them again in the future to add batteries (and another array, probably)!Posted on Julie Trinkner Highly recommend. Explained the entire process. Install was quick and answered all our questions.Posted on Karen Everything was good. Installers were professional.Posted on Dan Sinclair We worked with Full Spectrum to install solar through the MadiSUN Group Buy program. We signed in July 2025 and, despite challenging winter weather, the project was completed by December 2025; an impressive feat given their busy season. Deiter, our Project Manager, was exceptional: thorough, patient with questions, and consistently responsive. He walked us through multiple design options and kept me informed about any scheduling changes. Eric and his electricians expertly handled our electrical service upgrade, dealt with our old house's electrical complexities, and seamlessly added an EV charger during the project. Their pricing was competitive with four other quotes (local and national), but Deiter's knowledge and the company's strong local reputation made the difference. My instinct that they'd do the job right proved correct: they delivered quality work with excellent communication throughout.
See Our Work
Portfolio
We Can Help You
Estimate Your Savings
$90/Mo Electric Savings
10-14 Panels-
Up to $4,900 in State Grants
-
10-16 Year ROI
-
25 Year Warranty
$180/Mo Electric Savings
22-26 Panels-
Up to $4,900 in State Grants
-
10-15 Year ROI
-
25 Year Warranty
Articles

Full Spectrum Solar Teams up with Grow Solar Milwaukee- Group Buy
We’re proud to share that

The Design Reason Most Home Solar Panels Are Black
Residential solar panels are typically










