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How do I compare solar quotes and choose a solar installer in Central Wisconsin?

Updated October 2026. Put every quote on the same terms. Compare price per watt and system size, yearly production and its assumptions, equipment, all three warranties, who services the system, who handles permits and utility approval, battery sizing, and financing fine print. Then check the company: a Wisconsin electrical contractor credential, who actually does the install, and a record you can verify. Walk away from pressure tactics, "free solar," or any promise of the federal homeowner tax credit, which ended after 2025.

Northwind Solar is a worker-owned cooperative in Amherst, founded in 2007. We are glad to review a quote you already have.

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Residential and commercial solar installations in Central Wisconsin by Northwind Solar
How battery backup works in Central Wisconsin: diagram

What should I compare on each solar quote?

Line up the quotes side by side and check each item:

  • Price per watt and system size. Divide the total price before incentives by the system size in watts (DC). A lower total can just mean a smaller system.
  • Yearly production (kWh per year). Ask what shade, tilt, direction, and losses were assumed. You can check an estimate with NREL's free PVWatts calculator.
  • Savings assumptions. Ask what buyback or net-metering terms and rate increases the savings math uses. See how net metering works in Wisconsin.
  • Equipment. Get the exact brand and model of panels, inverters, and batteries, not just "tier 1."
  • Three warranties. Product (the equipment), performance (panel output over time), and workmanship (the installer's labor, roof penetrations, and wiring). Get each in writing, with its length.
  • Service. Who answers the phone if something fails in year eight?
  • Permits and interconnection. Does the price include permits, inspections, and your utility's application?
  • Battery sizing. Which circuits stay on in an outage, and for how long?
  • Financing fine print. Compare the cash price with the loan price. Look for dealer fees, rate changes, and prepayment terms.
  • Roof condition. If your roof needs replacing in the next few years, do it before solar goes up.
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Why do solar quotes differ so much, and what should I ask?

Quotes differ because of system size, equipment brand, battery choice, roof type, electrical work such as a main panel upgrade, trenching for a ground mount, and sales and financing costs. For a benchmark, EnergySage reported an average of $3.31 per watt and an average system size of 11.81 kW for Wausau-area quotes on its marketplace as of October 2026. Your home may differ.

Questions to ask every installer:

  • Does your company hold a Wisconsin electrical contractor credential, and who is the master electrician responsible for my job?
  • Will your own employees install my system, or a subcontractor? Where is the crew based?
  • How many systems have you installed in my county, and can I talk to past customers?
  • Are any of your installers NABCEP certified?
  • Which incentives does this price assume, and what happens if I don't get one?
  • Who handles service, and how fast?

Northwind Solar was founded in 2007 and has completed more than 1,000 projects since 2008, including 389 in Portage County, 141 in Marathon County, and 110 in Wood County. We also service and repair systems another company installed.

Sources: EnergySage Wausau solar data; FTC solar scam alert; Wisconsin DSPS Electrical Contractor credential; NABCEP certifications; IRS Residential Clean Energy Credit.

Red flags in a solar sales pitch

Most installers are honest, but some sales tactics should make you slow down. The FTC warns about several of these.

Pressure to sign today

A door-knocker with a "today only" price or a tablet you must sign on the spot is a reason to stop. The FTC says not to sign without seeing the full agreement. For many sales made at your home, the FTC Cooling-Off Rule gives you until midnight of the third business day to cancel.

"Free solar"

The FTC warns to avoid companies that say a government program will cover the whole cost of solar. "Free" usually means a lease, a loan, or a power purchase deal with payments for many years. Ask for the total you will pay over the life of the contract.

A tax credit that is gone

The federal Residential Clean Energy Credit is not available for systems placed in service after December 31, 2025. If a 2026 quote counts that credit in a homeowner's price or payback, ask the seller to redo the numbers. Wisconsin homeowners can still look at the Focus on Energy rebate, up to $2,400.

Who is really installing?

Some sales companies sell the job and hand it to a subcontracted crew from out of the area. Ask who will be on your roof, whether they are employees, and who will come back for service. A local installer can usually return faster when something needs attention.

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How do I choose a solar installer in Central Wisconsin?

Step 1 – Get two or three quotes

Give each installer the same 12 months of electric bills and the same goals, such as offsetting most of your use or adding backup power.

Step 2 – Put them side by side

Compare price per watt, kWh per year, equipment, warranties, and what is included, using the checklist above.

Step 3 – Check credentials

Look up the company's electrical contractor credential on Wisconsin's LicensE site and check installers in NABCEP's directory.

Step 4 – Ask for local references

Ask for project counts in your county, reviews, and past customers you can call.

Step 5 – Read the whole contract

Read the warranty, payment schedule, cancellation terms, and fees before you sign, and keep a copy.

Frequently Asked questions

Does a solar installer need a license in Wisconsin?

Solar and battery wiring is electrical work. In Wisconsin, a business that installs electrical wiring needs an Electrical Contractor credential from the Department of Safety and Professional Services (DSPS). The wiring must be done by licensed or registered electricians, with a master electrician responsible for the work. You can check a credential on the state's LicensE public lookup.

Is NABCEP certification required to install solar in Wisconsin?

NABCEP offers national certifications for solar and battery storage installers. It is not a Wisconsin license, so the state's electrical credential rules apply either way. Ask whether the people designing and installing your system are NABCEP certified, and check NABCEP's online directory. Northwind Solar has NABCEP-certified technicians.

Is price per watt a fair way to compare solar quotes?

It is a good start, because it corrects for different system sizes. But two quotes with the same price per watt can still differ a lot in equipment, yearly production, warranties, batteries, and what is included. Compare the cost per watt and the expected kWh per year together, then read the warranty and service terms.

How do I know if a production estimate is realistic?

Ask what shade, roof tilt, direction, and system losses the estimate assumes. Then enter your address and system size into NREL's free PVWatts calculator and see if the numbers are close. If one quote promises much more output from the same size system, ask the installer to explain why.

Will Northwind service a solar system another company installed?

Yes. Northwind Solar services and repairs systems installed by other companies, including systems whose installer has gone out of business. Use the service request form to tell us what equipment you have and what is going on. We can check performance, find faults, and help with warranty claims where they still apply.

Is there still a federal tax credit for home solar in 2026?

No. The IRS says the Residential Clean Energy Credit is not available for property placed in service after December 31, 2025. Wisconsin homeowners can still apply for a Focus on Energy rebate of $600 per kW, up to $2,400, for qualifying systems purchased and installed in 2026. See our incentives page.

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