What Goes Wrong With Solar Installations?
Solar is a major, long-term investment, and mistakes, in planning, installer choice, or system design, can cost money, reduce production, or create problems that last for decades. Avoiding them ensures your solar system delivers the savings and reliability you expect. Here’s what goes wrong and how to avoid it.
Mistake: Installing on an Old Roof
How to avoid it: Installing solar on a roof that’s aging or near the end of its life is a costly mistake, because when the roof needs replacing, the panels must be removed and reinstalled, an expensive extra step. Avoid it by assessing your roof’s condition first and replacing or repairing it before installing solar if it’s worn or aging. Since panels last decades, the roof beneath them should have comparable life left. Getting the roof right before installation prevents the expensive rework of pulling panels to redo the roof later. (For more on this, see How to Budget and Pay for Solar Panel Installation.)
Mistake: Choosing an Installer on Price Alone
How to avoid it: Picking the cheapest installer risks poor workmanship, inferior equipment, or a company that may not be around to honor warranties, serious concerns for a decades-long investment. Avoid it by choosing on reputation, experience, credentials, equipment quality, and warranty, not just price. A quality installer using good equipment and standing behind their work delivers a system that performs and lasts; a cut-rate one may cut corners you’ll regret. For a long-term investment tied to your roof and electrical system, the right installer matters far more than the lowest bid.
Mistake: Undersizing or Oversizing the System
How to avoid it: Getting the system size wrong, too small to meaningfully offset your bills, or larger than you need or your utility rewards, wastes money or opportunity. Avoid it by having a professional properly size the system to your actual electricity usage and goals, accounting for your consumption, roof space, and utility policies. A correctly sized system maximizes your return; an undersized one leaves savings on the table, while an oversized one may cost more than it returns. Proper sizing to your real needs is fundamental to good value.
Mistake: Not Understanding the Incentives
How to avoid it: Failing to understand or claim available incentives means overpaying for solar, since incentives substantially reduce the net cost. Avoid it by researching the federal, state, local, and utility incentives you qualify for, and confirming how they apply to your situation, before committing. A knowledgeable installer helps identify them. Because incentives change and vary by location, and can dramatically affect your true cost, understanding them is essential, missing an incentive you were eligible for is leaving real money on the table on a major purchase. (For more on this, see Questions to Ask a Solar Installer.)
Mistake: Ignoring Utility Policies
How to avoid it: Overlooking how your utility handles solar, net metering, rate structures, interconnection requirements, can lead to disappointment if the savings don’t match expectations. Avoid it by understanding your utility’s solar policies before installing, since they directly affect your savings and whether a battery adds value. Solar’s economics depend partly on utility policies, so knowing yours ensures your expectations are realistic and your system is designed to maximize savings under your specific utility’s rules. Don’t assume, verify how your utility treats solar.
Mistake: Skipping the Fine Print on Contracts and Warranties
How to avoid it: Not carefully reviewing the contract, warranties, and any lease or financing terms can lead to surprises about ownership, obligations, or coverage. Avoid it by reading and understanding all terms before signing, the equipment and workmanship warranties, the production guarantees if any, and the financing or lease terms and their long-term implications. For a decades-long investment, the details matter. Understanding exactly what you’re agreeing to, what’s covered, who owns the system, and what your obligations are, protects you and prevents costly misunderstandings down the road.
The Mistake of Rushing or Falling for High-Pressure Sales
A mistake that underlies many others is rushing the decision or succumbing to high-pressure sales tactics, which are unfortunately common in the solar industry. Because solar is a significant, decades-long investment tied to your roof and finances, it deserves careful research and comparison, not a same-day signature driven by a limited-time offer or an aggressive salesperson. High-pressure tactics, artificial urgency, exaggerated savings claims, pressure to sign immediately, are warning signs, and a reputable installer gives you the information and time to make a considered decision rather than pushing you toward a fast close. Rushing into a solar contract under pressure is how homeowners end up with the wrong system, an overpriced deal, or an installer they later regret. (For more on this, see How to Find the Best Solar Installer.) The Department of Energy’s Homeowner’s Guide to Going Solar walks through site suitability, financing options, and what to ask an installer.
The defense is to treat solar like the major purchase it is: get multiple quotes, compare them carefully, verify the incentives and realistic production estimates, check the installer’s reputation and stability, and read the contract and warranties thoroughly before signing anything. If a salesperson pressures you to commit on the spot or won’t give you time to compare, that itself is a reason for caution. Legitimate installers understand that an informed customer making a considered decision is a good customer, and they support your due diligence rather than undermining it. Taking the time to research and compare, rather than being rushed by sales pressure or a supposedly expiring deal, is one of the most important things you can do to avoid the many downstream mistakes and end up with a solar system and installer you’re genuinely happy with for decades.
Staying Ahead of Mistakes
The common solar mistakes, installing on an old roof, choosing on price, wrong sizing, not understanding incentives, ignoring utility policies, and skipping the fine print, are all avoidable with careful planning and a reputable installer. When you’re ready to connect with a qualified local pro, connect below.
Frequently Asked Questions
Installing on an old roof. Since panels last decades, putting them on an aging roof means removing and reinstalling them when the roof needs replacing, an expensive extra step. Assess your roof's condition first and replace or repair it before installing if it's worn. The roof beneath decades-lasting panels should have comparable life left.
No. The cheapest installer risks poor workmanship, inferior equipment, or a company that may not be around to honor warranties, serious for a decades-long investment. Choose on reputation, experience, credentials, equipment quality, and warranty. A quality installer delivers a system that performs and lasts; a cut-rate one cuts corners. The right installer matters far more than the lowest bid.
Yes. Too small fails to meaningfully offset your bills; larger than you need or your utility rewards wastes money. Have a professional size the system to your actual electricity usage and goals, accounting for consumption, roof space, and utility policies. A correctly sized system maximizes your return, so proper sizing to your real needs is fundamental to good value.
Because failing to understand or claim available incentives means overpaying, since they substantially reduce the net cost. Research the federal, state, local, and utility incentives you qualify for and confirm how they apply before committing. A knowledgeable installer helps identify them. Missing an incentive you were eligible for is leaving real money on the table on a major purchase.
Yes. Overlooking how your utility handles solar, net metering, rate structures, interconnection, can lead to disappointment if savings don't match expectations. Solar's economics depend partly on utility policies, so understand yours before installing, since they affect your savings and whether a battery adds value. Knowing your utility's rules ensures realistic expectations and a system designed to maximize savings.
