Learning how to choose a solar panel company is harder than it looks, because “company” hides two very different decisions. One company sells you the system, designs it, pulls the permits, and bolts it to your roof. A separate company, often one you never speak to, actually manufactures the panels sitting up there for the next 25 to 40 years. Homeowners in California who blur these two together tend to buy on price alone and regret it later, usually when a claim needs filing, and nobody answers the phone. This guide separates the installer decision from the manufacturer decision and gives you a practical way to vet both before you sign.
Installer vs. Manufacturer: Two Companies, Two Decisions
The solar industry rarely explains this cleanly, so start here. The manufacturer is the factory that engineers and builds the physical panels, tests them, and stands behind them with a product and performance warranty. The installer is the local business that designs a system for your roof and your utility, secures permits and inspections, and physically installs the equipment. These are rarely the same organization. A proven panel installed poorly, or a great crew installing a weak panel, undermines the whole investment either way. Choosing well means judging both on their own terms rather than assuming a good price on one guarantees quality on the other.
The reason this matters is accountability. When something goes wrong years later, the fix depends on which party is at fault and whether that party is still reachable. A cracked panel is a manufacturer issue; a roof leak around a mount is an installer issue. Vet only one of the two has a coverage gap you will not discover until you need it.
What a Panel Manufacturer Is Responsible For
The manufacturer owns everything about the product itself: cell technology, build quality, degradation rate, and the long warranty that promises the panel will still produce a defined percentage of its rated output decades from now. This is the decision covered in depth in our guide to choosing the right panel manufacturer, and it deserves its own scrutiny. You are evaluating how long the manufacturer has actually been building panels, whether their reliability claims rest on field-tested data rather than marketing, and whether the company will realistically exist to honor a 25 or 40-year warranty.
Brand matters here more than in most purchases, because the warranty is only as strong as the balance sheet behind it. Understanding who actually makes the panels tells you whether that promise is backed by a serious, long-running manufacturer or by a label that could disappear. What the manufacturer does not do is design your system, handle your permits, or answer for how the panels were fastened to your roof. That entire second half belongs to the installer.
What a Solar Installer Is Responsible For
The installer is the company you are actually hiring to work on your home. They assess your roof, size the array for your usage and your utility’s rules, engineer the layout, pull permits, coordinate the inspection, connect the system, and file the interconnection paperwork. They also own the workmanship: the mounting, the wiring, the flashing that keeps water out, and the cleanup. When people picture a “solar company,” this is almost always who they mean, and it is where the largest quality gap in the industry lives.
Two installers can quote the same panel and inverter and deliver wildly different outcomes. One anchors the system correctly and leaves a watertight roof for 25 years. Another rushes the flashing, misfiles the interconnection, and vanishes when the first rain reveals a leak. Because the installer touches your roof and your utility relationship directly, vetting this company carefully is the single highest-leverage thing you can do.
How to Vet a Solar Installer Before You Sign
This is the part most buying guides skip. A polished sales pitch tells you almost nothing about whether a crew can build a durable system, so work through the checks below on every company you are seriously considering.
Confirm the License and Classification
In California, solar installation is licensed work. Verify the contractor holds an active license through the Contractors’ State License Board, and check the classification: a C-46 solar license or a C-10 electrical license is what you want to see for this work. Confirm the license number on the state’s public lookup rather than trusting a logo on a brochure, and make sure the name on the license matches the company writing your contract.
Check Insurance, Bonding, and Business Longevity
A legitimate installer carries general liability insurance and workers’ compensation, so a job-site injury or a mistake on your roof does not become your financial problem. Ask for current certificates. Then look at how long the business has operated under its current name. A company that has been installed in your region for many years is far more likely to be around to honor its workmanship warranty than one founded last spring, and longevity is the best predictor of whether claims get answered at all.
Read the Workmanship Warranty and the Reviews
The installer’s workmanship warranty is separate from the panel warranty and covers their labor, the mounting, and roof penetrations. Read the length and the fine print, because a strong installer typically backs their work for 10 years or more, while a weak one offers a token year. Then verify their reputation with recent, verifiable reviews and, ideally, a local reference or two you can actually contact. Lowballing the workmanship guarantee is a common tell, and skimping on the install is exactly the kind of corner-cutting explored in our look at the hidden cost of cutting corners.
Watch for High-Pressure Red Flags
Be wary of any company that demands a same-day signature, pushes a “today only” discount, wants a large payment before permits are approved, or buries a large dealer fee inside a low advertised monthly payment. Reputable installers give you time, itemize their pricing, and welcome comparison. Pressure is a signal that the company is optimizing for the sale, not for the 25 years you will live with the result.
How the Product Warranty and Workmanship Warranty Fit Together
Once you understand the two companies, the two warranties make sense. The manufacturer provides the panel’s product and performance warranty, which covers defects in the panels and guarantees a minimum output over time. The installer provides the workmanship warranty, which covers the quality of the physical installation. These are two layers of protection, and a well-chosen system has both. A gap in either one leaves you exposed: a flawless panel installed badly still leaks, and a perfect installation of a failing panel still underproduces.
The practical catch is that coverage only holds if the responsible party is still in business and the paperwork was filed correctly. Manufacturer warranties often require the installer to register the system at commissioning, and whether that coverage survives a home sale frequently depends on transfer steps the installer is supposed to handle. This is one more reason installer longevity matters: a defunct installer cannot honor a workmanship claim or help you transfer coverage, no matter how good the panel is.
Questions to Ask Before You Choose a Solar Company
Bring the same questions to every company so you are comparing like for like. Good answers are specific and written into the proposal; vague or evasive answers are their own kind of red flag.
Questions About the System and the Work
Ask how they arrived at the system size and production estimate, and make sure the logic is transparent rather than a round number pulled from thin air. Correctly sizing the system for your actual usage and your utility’s current rules is the installer’s job, and a serious company can walk you through it. Ask who performs the installation, whether it is in-house crews or subcontractors, and who to call for service after the system is running.
Questions About the Panels and the Price
Ask exactly which panel model and inverter are in the proposal, and confirm the brand and specifications rather than accepting “premium panels” as an answer. Comparing panel models and real pricing helps you sanity-check whether the quote is fair for the equipment you are getting. Insist on an itemized price with no hidden dealer or financing markups, and get every promise, from production estimates to warranty terms, in writing before you sign.
Why the Right Installer and the Right Brand Matter Together
The strongest outcome pairs a diligent, properly licensed installer with a manufacturer that has a genuine long-term reliability record. That pairing is what a certified dealer relationship is designed to deliver: a vetted local installer standing behind the workmanship, plus a proven panel brand standing behind the product. US Power installs a brand with a proven reliability record and backs the installation with its own workmanship warranty, so both layers of protection come from parties that intend to be around for the long haul. That is the difference between a system that quietly performs for decades and one that becomes a series of unanswered phone calls.
Getting Both Decisions Right
Choosing a solar panel company is really two choices wearing one label. Pick the installer for licensing, insurance, longevity, a real workmanship warranty, and a straight-talking sales process, and pick the manufacturer for proven, field-tested reliability and a warranty backed by a company that will last. Vet both, get everything in writing, and refuse to be rushed. If you want help sorting a good installer and a proven panel brand from the noise, you can talk to the US Power team at maxeonsolarpanels.com/contact-us for a straightforward, no-pressure conversation about your roof and your options.
Frequently Asked Questions
Is the solar installer the same company as the panel manufacturer?
Rarely. The manufacturer is the factory that builds and warranties the physical panels, while the installer is the local contractor who designs your system, pulls permits, and mounts the equipment on your roof. You are effectively hiring one company and buying a product from another, which is why each deserves its own evaluation.
Do solar installers need a license in California?
Yes. Solar installation is licensed work in California, and a legitimate installer holds an active license through the Contractors’ State License Board, typically a C-46 solar or C-10 electrical classification. Always verify the license number on the state’s public lookup and confirm it matches the company on your contract before signing.
What is the difference between a product warranty and a workmanship warranty?
The product warranty comes from the manufacturer and covers defects in the panels, plus a guaranteed level of output over 25 years or more. The workmanship warranty comes from the installer and covers the quality of the physical installation, including mounting and roof penetrations. A well-chosen system carries both, because they protect against completely different failures.
How do I know if a solar company will still be around to honor its warranty?
Look at how long the business has operated under its current name, check verifiable reviews and references, and confirm it carries proper insurance and bonding. For the panel itself, choose a manufacturer with a long track record and the financial strength to back a decades-long warranty. Longevity on both sides is the best predictor that a future claim will actually get resolved.
What are the biggest red flags when choosing a solar company?
High-pressure sales tactics, “today only” discounts, requests for large payments before permits are approved, refusal to itemize pricing, and dealer fees hidden inside a low monthly payment. An unusually cheap bid is also a warning, because the savings usually come from corners cut on the installation or the equipment.