Full Spectrum Solar Review
Solar, battery and EV charger installerBased in Madison, WisconsinProfile updated October 13, 2026
Is Full Spectrum Solar a good choice?
Full Spectrum Solar fits southern Wisconsin homeowners who want a local installer with its own electricians and service department. It says it has installed solar in Wisconsin since 2002, uses no commissioned salespeople and services systems other companies installed. It publishes no workmanship or roof penetration term and lists no financing for homes. Ask for the warranty documents and payment options in writing.
- Price
- Quote required; its homepage calculator gives a planning estimate it says is not a quote. Costs
- Coverage
- WI: Madison, Dane County and southern and southeastern Wisconsin. Service area
- Warranty
- Advertises “industry-leading warranty coverage”; workmanship and roof terms not published. Warranty
On this page
Why choose Full Spectrum Solar, and why you might not
What Full Spectrum does well, and where to be careful, compared with the installers it competes with most.
Reasons to choose Full Spectrum
Its Google score is the highest hereIts head-office Google listing shows 5 from 206 reviews. That is the highest score in the table below. Owners praise neat work, clear answers and no pressure to buy.
It fixes systems other companies put inFull Spectrum has its own electricians and its own service team. It says it also services systems that other companies installed. Two owners say it took their panels off and put them back smoothly after hail hit their roofs.
Its sales staff are not paid by the saleFull Spectrum says it uses no salespeople who earn a commission. It says it has put in solar in Wisconsin since 2002.
It names the batteries it usesIt mainly uses Enphase batteries, and also offers Tesla, SolarEdge, FranklinWH and Generac. You can look these up before a sales visit.
Reasons to look at others
It lists no warranty on its own workFull Spectrum publishes no warranty on its own work or for leaks where the panels are bolted to the roof. Arch lists 5 years on its work, and Certasun lists 10. Get both in writing.
It lists only one way to payIts pages are written for people who buy the system outright. It lists no loan, no rent plan and no PPA. Ask what financing it can arrange.
No panel brands or license numberFull Spectrum names no panel or inverter brand. It prints no Wisconsin license number. Ask for the exact models in your written quote, and ask for its license number.
Its reviews do not show how it handles problemsWe found no negative reviews among those we read. That does not tell you how it handles problems. Ask who takes service calls after the install and how fast they respond.
Full Spectrum Solar reviews: what customers say
Each review site shows its own score; we read them on October 12 and 13, 2026 and do not combine them or add our own rating.
- Google5 / 5206 reviews · Madison, WI office listing only, not company-wideRead reviews
The five positive reviews below praise quick, clear communication, neat installations finished on time and on budget, and no-pressure sales, and two owners report panels removed and reinstalled smoothly after hail damage to their roofs. There were no negative reviews among the reviews we read. Positive reviews alone do not show how a company handles problems. Ask Full Spectrum how it handles panel removal and reinstallation if your roof needs work later.
5 recent 5-star reviews
“If you're considering solar and storage, I'd highly recommend working with Ron and the team.”
Mark M. · Read on Google
“Very happy with my solar, thank you.”
R K · Read on Google
“I highly recommend Full Spectrum.”
Cindy M. · Read on Google
“Our installation was excellent and all billing was transparent.”
Eric Z. · Read on Google
“FSS was helpful, communicative, and responsive in getting the solar panels off and then reinstalled in a timely manner.”
Gary K. · Read on Google
How we picked these: the five newest 5-star and the five newest 1- or 2-star reviews with written text on Google and Trustpilot, as of October 2026 (200 reviews read, back to Dec 27, 2016). We found no Trustpilot page for Full Spectrum Solar on October 12, 2026. Each quote is one sentence, word for word. Picking the highest and lowest ratings shows the range of experiences; it is not a representative sample, and we did not verify what reviewers describe.
How much does Full Spectrum Solar cost?
Full Spectrum Solar publishes a planning calculator on its homepage that uses a stated per-watt base price, but it says the result is not a quote. Ask for an itemized quote showing the cash price, system size and equipment models, and which incentives, if any, it assumed. For state price ranges, see our solar panel cost guide; for how the plans compare, see loans, leases and PPAs.
Purchase
You own itIts FAQ and calculator are written for buyers. No residential loan, lease or PPA is listed; ask what financing it can arrange.
Based on Full Spectrum Solar’s FAQ and homepage calculator, read October 13, 2026. Its nonprofit page describes bridge loans and long-term financing through Legacy Solar Co-op for organizations, not homeowners.
Full Spectrum Solar does not name panel or inverter brands on the pages we read; its homepage mentions “North American product options.” Its battery page says it mainly designs with Enphase batteries and also offers Tesla, SolarEdge, FranklinWH and Generac. Its roof attachment article says flashing plates under the shingles are its first choice on asphalt roofs. Your written proposal should list the exact panel, inverter and battery models, the system size in kilowatts (kW) and the forecast yearly production in kilowatt-hours (kWh).
What does Full Spectrum Solar’s warranty cover?
Coverage | What Full Spectrum publishes | What to confirm |
|---|---|---|
Solar panels | Not published as a company term | Confirm in your proposal: the panel maker and its warranty term. |
Panel output | “Performance warranties up to 25 years,” per its FAQ | The output guarantee for your panel model and its term. |
Inverter | Not published | Confirm in your proposal: the inverter model, its maker’s term and who pays labor to replace it. |
Battery | Maker’s warranty; the company says Enphase offers 10+ years | The battery model you get and who services it. |
Labor and workmanship | Not published | Confirm in your proposal: the workmanship warranty term behind its “industry-leading warranty coverage” claim. |
Roof penetrations | Not published | Confirm in your proposal: who repairs and pays if a leak starts at a panel mount. |
Company-published terms from Full Spectrum Solar’s FAQ, battery page and homepage, read October 13, 2026. It has no separate warranty page. Your signed agreement decides what applies.
Its roofing page covers removing and reinstalling panels for reroofing; that is a separate service, not a roof warranty.
Where does Full Spectrum Solar operate, and which licenses were checked?
Full Spectrum Solar’s homepage says its work is concentrated around Madison and southeastern Wisconsin, with offices in Madison and Waukesha (read October 13, 2026). Its 24-year anniversary post says its projects are densest around Madison and Dane County and reach southern, central and southeastern Wisconsin. A listed area does not mean every address qualifies or that EcoGen can connect you with Full Spectrum Solar there.
Showing Madison, WI (headquarters)
Office addresses (2)
- Madison, WI (headquarters)1240 East Washington Ave, Madison, WI 53703Show on mapOpen in Google Maps
- Waukesha, WI (Waukesha/Milwaukee area)2110 Pewaukee Rd, Unit 103, Waukesha, WI 53188Show on mapOpen in Google Maps
Address from Full Spectrum’s website, read October 13, 2026.
Licenses
We have not checked Full Spectrum’s licenses in a state registry yet, and its website does not list license numbers we could match. Check the license yourself under the exact business name on your contract. A license check confirms registration, not workmanship quality.
Wisconsinno number publishedNot published
- License
- Electrical license
- Number
- Not published
- Registry check
- Not checked by us
- Note
- The homepage says its team includes certified master electricians but prints no license number (read October 13, 2026). Ask for it before you sign.
Full Spectrum Solar’s about page says its team includes NABCEP-certified professionals, and its homepage mentions certified master electricians. It shows Midwest Renewable Energy Association and Focus on Energy logos on its homepage. These are company statements; we did not verify them.
Full Spectrum Solar compared with three other installers
Each of these three also serves Wisconsin, Full Spectrum’s only state. Arch and Current Electric are Wisconsin electrical contractors, and Certasun, like Full Spectrum, puts in batteries and car chargers. Every fact comes from the company profiles linked below.
| Full Spectrum SolarThis page | Arch Solar | Current Electric | Certasun | |
|---|---|---|---|---|
| Best for | A local crew with its own electricians and service | One electrical contractor with its own crews | Solar, batteries, generators and car chargers together | One local crew for panels, battery and car charger |
| Head office | Madison, WI | Plymouth, WI | Wauwatosa, WI | Buffalo Grove, IL |
| States shared with Full Spectrum | Its only state | 1: WI | 1: WI | 1: WI |
| Roofing | Not listed | Not listed | Not listed | Not listed |
| Ways to pay | Buy | Buy, loan | Buy, financing, rent | Buy, loan, rent, prepaid plan |
| Labor warranty | Not listed | 5 years | Not listed | 10 years |
| Roof leak warranty | Not listed | No set term; fixes damage it causes | Not listed | Not listed |
| Brands named | Enphase, Tesla, SolarEdge, FranklinWH, Generac (batteries) | Tesla, FranklinWH (batteries) | FranklinWH, Generac, Tesla (batteries) | REC, Enphase, Tesla, FranklinWH |
| Google score* | 5 (206 reviews) | 4.6 (64 reviews) | 4.9 (2,255 reviews) | No Google listing found |
*Each Google score is for the company’s head-office listing only, read October 12 and 13, 2026.
Full profiles: Arch Solar · Current Electric · Certasun
Before choosing Full Spectrum Solar
Ask for these in writing:
- An itemized quote with the cash price and the financed total, including the APR and all fees.
- The exact panel, inverter and battery models, the system size in kW and the forecast yearly production in kWh.
- The warranty documents for your payment plan: panels, inverter, labor and roof penetrations.
- Your local service contact, and who handles utility approval and warranty claims.
- The exact company on the contract, such as Full Spectrum Solar, and its license for your state.
Before you sign, read the quote line by line and bring our questions to ask a solar installer.
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How we researched this profile
We read Full Spectrum Solar’s own pages on October 13, 2026: homepage, about, services, solar electric, battery backup, roofing, FAQ, resources, nonprofit solar, roof attachment and anniversary articles, and contact. We did not check its licenses in a state registry. We did not buy a system, request a quote, visit an office or interview customers. Full Spectrum Solar did not review this page.
Our installer methodology explains what we check.
Sources (9)
- Full Spectrum Solar: Homepage (addresses, calculator), read October 13, 2026
- Full Spectrum Solar: About us, read October 13, 2026
- Full Spectrum Solar: Solar electric, read October 13, 2026
- Full Spectrum Solar: Energy storage and battery backups, read October 13, 2026
- Full Spectrum Solar: FAQ, read October 13, 2026
- Full Spectrum Solar: Roofing, removing and installing solar, read October 13, 2026
- Full Spectrum Solar: How solar attaches to your roof, read October 13, 2026
- Full Spectrum Solar: Celebrating 24 years, read October 13, 2026
- Full Spectrum Solar: Solar for nonprofit organizations, read October 13, 2026