What Should You Ask a Solar Installer?
Solar is a decades-long investment tied to your roof and electrical system, so the installer you choose matters enormously. The right questions before signing reveal whether an installer is experienced, reputable, and offering a well-designed system with solid warranties. Here’s what to ask to protect your investment.
What Size System Do I Need, and Why?
Ask how they determined the system size and why it’s right for your home. A good installer bases the size on your actual electricity usage, roof space, and goals, and can explain the reasoning. Understanding why they’re proposing a particular size, and how it relates to your energy use and expected production, ensures the system fits your needs rather than being oversized or undersized. An installer who thoughtfully sizes the system to your consumption is designing for your benefit; one who proposes a size without clear justification warrants more questions.
What Equipment Are You Using, and Why?
Ask about the specific panels, inverter, and components they’ll install, and why they’ve chosen them. Equipment quality affects both production and longevity, and a good installer explains the trade-offs of their chosen panels and inverter type (string versus microinverters or optimizers) for your roof. Understanding the equipment, and its warranties, helps you judge the system’s quality and value. An installer who can explain their equipment choices and how they suit your specific roof and needs is demonstrating expertise and giving you the information to compare quotes meaningfully. The Department of Energy’s Homeowner’s Guide to Going Solar walks through site suitability, financing options, and what to ask an installer.
What Will My Real Cost Be After Incentives?
Ask for a clear breakdown of the total cost and your net cost after all applicable incentives. A reputable installer helps identify the federal, state, local, and utility incentives you qualify for and shows your true out-of-pocket cost. Understanding the net cost, not just the sticker price, is essential to evaluating solar’s value. An installer who is transparent about the full cost and the incentives, and doesn’t overpromise savings, is being honest, which is exactly what you want when making a major financial decision about a long-term investment. (For more on this, see How to Find the Best Solar Installer.)
What Production Can I Expect, and Do You Guarantee It?
Ask how much electricity the system is expected to produce and whether they offer any production guarantee. A good installer provides a realistic production estimate based on your roof and location, and being clear about expected output helps you evaluate the savings and payback. Some installers offer production guarantees. Understanding the expected production, and any guarantee behind it, protects you from a system that underperforms and helps set realistic expectations for your savings. Beware of installers who promise unrealistically high production or savings.
Are You Licensed, Insured, and Experienced?
Ask about licensing, insurance, and experience with installations like yours. Solar involves roofing and electrical work, so proper credentials and insurance are essential, and an experienced installer with a track record is far more likely to do quality work that lasts. Confirm they’re properly licensed for both the electrical and roofing aspects and carry adequate insurance, protecting you if something goes wrong. An established, credentialed, experienced installer is a safer choice for work that ties into your home’s structure and electrical system for decades.
What Warranties Do You Offer, and Will You Be Around?
Ask about all the warranties, on the equipment, the workmanship, and the roof penetrations, and, importantly, whether the company is likely to be around to honor them. Solar warranties span many years, and a warranty is only as good as the company behind it. A long-established, financially stable installer is more likely to be there if you need warranty service years later. Understanding the warranties and the installer’s stability protects a decades-long investment, since you want assurance that both the equipment and the company will stand behind the system over its long life.
Asking About the Roof, Timeline, and What Happens After
A few practical questions round out your evaluation of a solar installer. Ask specifically about your roof: have they assessed its condition and suitability, do they think it needs any work before installation, and how do they handle the roof penetrations to prevent leaks? Since solar mounts to your roof and involves drilling into it, an installer’s approach to protecting your roof’s integrity, and their willingness to flag if the roof needs attention first, is important for avoiding the costly problem of installing on a roof that will soon fail or that leaks around the mounts. A thorough installer treats the roof as central, not an afterthought. (For more on this, see Hidden Costs of Solar Panel Installation.)
Also ask about the realistic timeline and what support you’ll get after installation. Solar involves design, permitting, installation, inspection, and utility approval, so ask for a realistic estimate of the full process, not just the installation days, and who will handle the permitting and utility interconnection paperwork. Just as important, ask what happens after the system is running: how do they handle service or warranty issues, do they provide monitoring so you can verify production, and how do you reach them if something goes wrong years later? Understanding the timeline sets expectations, and understanding the post-installation support tells you whether you’re buying from a company that will stand behind the system over its long life or one that disappears after the sale. Both are essential for a decades-long investment. (For more on this, see Common Solar Installation Mistakes and How to Avoid Them.)
Putting It Together
These questions, especially about system sizing, equipment, net cost, production, warranties, and the installer’s stability, ensure you hire a reputable installer offering a well-designed system you can rely on for decades. A trustworthy installer answers them all clearly. When you’re ready to get quotes from qualified local pros, connect below.
Frequently Asked Questions
How they sized the system and why, what equipment they'll use and why, your real cost after all incentives, the expected production and any guarantee, whether they're licensed, insured, and experienced, and what warranties they offer and whether the company will be around to honor them. These cover system design, cost, performance, and long-term protection.
Based on your actual electricity usage, roof space, and goals, and they should be able to explain the reasoning. Understanding why they propose a particular size, and how it relates to your energy use and expected production, ensures the system fits your needs rather than being oversized or undersized. An installer who thoughtfully sizes to your consumption is designing for your benefit.
Ask for a clear breakdown of the total cost and your net cost after all applicable incentives. A reputable installer helps identify the federal, state, local, and utility incentives you qualify for and shows your true out-of-pocket cost. Understanding the net cost, not just the sticker price, is essential to evaluating solar's value, and transparency here signals honesty.
Some do, and it's worth asking. A good installer provides a realistic production estimate based on your roof and location, and some offer production guarantees. Understanding the expected output, and any guarantee behind it, protects you from a system that underperforms and sets realistic savings expectations. Beware of installers who promise unrealistically high production or savings.
Because solar warranties span many years, and a warranty is only as good as the company behind it. A long-established, financially stable installer is more likely to be there to honor warranty service years later. Understanding the installer's stability, alongside the warranties on equipment, workmanship, and roof penetrations, protects a decades-long investment tied to your home.
