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Solar Installer GuildUnited States · independent

Full Spectrum Solar

Solar energy company · Madison, WI

What the listing shows you

5.0★

201 Google reviews

What it doesn’t

0%

rated 1–2★

typical in the Milwaukee area, 2%

Newest review held

Aug 2026

newest held review this month

Google's rating breakdown · all 201 reviews

Rated 1–2★
0%
typical in the Milwaukee area, 2%
Posted an update
—
we saw no owner post, which is not the same as none existing
Replies to reviewers
100%
of the 201 reviews we hold

Its one and two star share is 2 points below the typical installer in the Milwaukee area. Across Wisconsin, 28 of the 58 installers whose breakdown Google has published carry a higher share than this one.

The percentages are Google’s own arithmetic over every review it holds, not a sample we assembled. Separately we hold 201 review texts for this company, quoted below. Google publishes review ages rather than dates, so every date here is approximate.

On the Wisconsin ranking

The strongest review record in Wisconsin →

Ordered by the share of one and two star reviews, weighted by how many reviews stand behind it. It ranks review records, not workmanship.

Every company we hold in the Milwaukee area, on one axis

0% rated 1–2★40%

Each mark is one company we hold in the Milwaukee area whose Google breakdown has been read, placed by its share of one and two star reviews. Full Spectrum Solar is the red one. The amber line is the middle of that set, which includes suppliers and maintenance businesses as well as installers.

What reviewers said

  • 5★ · around August 2026 · the company replied

    We had excellent service from Spectrum Solar. Ron and his crew worked through some unique challenges and he always communicated thoroughly and promptly. We were especially impressed with their determination and focus to work through issues brought up from our electric company. Each step was intentional, thoughtful, and professional. We strongly recommend Spectrum Solar to others who are considering adding solar to their property. We also found everyone from this company to go above and beyond to answer questions and help with additional support so we could use the Enlighten app to see our ener

  • 5★ · around August 2026 · the company replied

    Just got my solar system up and running. The system came in on time and on budget. There were no surprises, and Ted and his crew were good at communicating throughout. In comparing FSS's prices to another vendor's, I found their costs to be very reasonable. In sum: A pleasure working with FSS and I'd recommend them to all prospective customers. Update (7/30/26): Due to a hailstorm in April, my roof needed to be removed and replaced. This required having my solar panels removed and then reinstalled by FSS after the new roof was in place. FSS was helpful, communicative, and responsive in getting

  • 5★ · around August 2026 · the company replied

    Hi everyone. I can't say enough about Ron and his team. From start to finish. Absolutely spit on. I've been in construction all my life. I'd hire them anytime. My electricity and gas bill are 40$ to 70$. And I like my house cool. This is almost August 2026. Completely satisfied, especially when friends are crying about there 3 to 400$ bill.

Reviewer names are not published here. Negative reviews are shown first because they are the ones a listing hides, not because they are more representative.

What reviewers keep mentioning

  • solar installation 36
  • project management 25
  • scheduling 16
  • responsive staff 12
  • rooftop solar 11
  • ev charger installation 7
  • reasonable quote 6
  • installation crew 5
  • no pressure sales 3
  • home solar array 2

Topics Google derives from the review text, with how often each appears. A frequent topic is not a good one: “price” turns up in praise and in complaints alike.

What the company says about itself

Taken from its own website. We have not checked any of it, and a sentence on a website is not evidence.

  • Family owned

    “Contractor" Full Spectrum Solar is a family owned and operated business that has been…”

Its website also mentions warranty, but not in a sentence we can quote cleanly.

Elsewhere

  • It is also reviewed on Yelp. Worth reading before you sign anything: those are a different crowd, and the complaints that reach the Better Business Bureau rarely reach Google.
  • It posts on LinkedIn and Facebook. A page that stopped posting years ago tells you something a listing will not.

When they say they are open

Sunday
Closed
Monday
8 AM to 5 PM
Tuesday
8 AM to 5 PM
Wednesday
8 AM to 5 PM
Thursday
8 AM to 5 PM
Friday
8:30 AM to 4 PM
Saturday
Closed

As Google published them when we last read the listing, not a live check. Ring before you drive anywhere.

Who Google shows alongside them

Google’s own “people also viewed” set, in Google’s order. It is Google’s comparison, not ours.

The ones without a link have no page here, either because Google does not categorise them as solar businesses or because we could not match the name to a listing with confidence.

Other installers around Milwaukee

1–2★3★4★5★gauge 0–20%typical here, 2%

Ordered by how much we can tell you about each, which is not an order of quality. We do not know which of these is better and would not say if we did.

What we don't know

  • The date above is the newest review we hold, which is not necessarily the newest that exists — we hold a large share of Google's reviews, not all of them.
  • We do not verify licences, insurance or bonding. Nothing here has been checked against a state licensing board.
  • We cannot tell you what an installation costs, and we hold nothing about the equipment they fit.

Something wrong here? Tell us and a person will read it.

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