Installing solar panels is a significant investment, and when designed and installed correctly, a solar system can provide reliable, renewable electricity for decades.
However, not every installation delivers the same results.
Many of the problems homeowners experience aren’t caused by the solar panels themselves, but by decisions made before the installation even begins. From choosing the wrong installer to overlooking your home’s future energy needs, a few common mistakes can reduce the performance and value of your investment.
The good news is that they’re all avoidable.
Here are 10 of the most common solar installation mistakes and how to avoid them.
It’s tempting to choose the cheapest quotation, but the lowest price doesn’t always represent the best value. A reputable installer like Sheerwater Solar will provide:
An unusually low quote may indicate compromises in equipment, workmanship or aftercare. Instead, compare what’s included rather than simply comparing prices.
One of the most important checks you can make is whether your installer is MCS certified.
The Microgeneration Certification Scheme (MCS) sets recognised quality standards for renewable energy installations. Using an MCS-certified installer is also typically required if you want to access the Smart Export Guarantee (SEG). Before agreeing to any installation, check that your installer appears on the official MCS register.
Bigger isn’t always better. A system that’s too small may not generate enough electricity for your household, while an oversized system may not deliver the best return on investment.
A professional installer like Sheerwater Solar, will recommend a system based on factors such as:
Every home is different, which is why bespoke system design is so important.
Many homeowners only think about their current electricity usage. But what about five years from now? You may be planning to:
Planning for future demand can make your solar investment even more valuable in the long term.
Solar panels are designed to last for 25 years or more. If your roof is already approaching the end of its lifespan, it may make sense to replace it before installing solar.
Removing and reinstalling solar panels later to carry out roofing work can add unnecessary cost and disruption. If you’re already planning a roof replacement, it’s often the ideal opportunity to install solar at the same time.
Even a high-quality solar system won’t perform at its best if it’s regularly shaded. Nearby trees, chimneys and neighbouring buildings can all reduce electricity generation.
A professional survey should include a detailed shading assessment to identify any potential issues before installation. According to the Energy Saving Trust, reducing shading wherever possible helps maximise the amount of electricity your system can generate.
It’s not just about fitting as many panels onto the roof as possible. A good installer will carefully design the panel layout to maximise:
Roof windows, chimneys and roof vents should all be considered when planning the final design. A well-planned installation will often look as good as it performs.
Battery storage isn’t essential for every home, but it’s worth discussing during the design stage. Even if you don’t install a battery immediately, planning for one in the future can make upgrades simpler later.
A battery allows you to store surplus electricity generated during the day and use it in the evening, helping reduce your reliance on electricity from the grid.
Your installer should explain whether battery storage is likely to benefit your household.
Before signing a contract, make sure you understand exactly what’s covered. There are usually several different warranties involved, including:
Knowing who to contact if something goes wrong provides valuable peace of mind. A reputable installer should explain these warranties clearly before work begins.
Perhaps the biggest mistake of all is relying on online estimates or generic quotations without a proper site visit. A professional survey assesses factors including:
The Energy Saving Trust recommends obtaining a professional assessment before installing solar panels to ensure the system is correctly designed for your home. Without this information, it’s impossible to accurately recommend the right system.
| Mistake | How to Avoid It |
| Choosing the cheapest quote | Compare quality, experience and what’s included, not just price. |
| Using a non-certified installer | Choose an MCS-certified installer. |
| Installing the wrong size system | Base the design on your energy usage and future needs. |
| Ignoring future electricity demand | Consider EVs, batteries and heat pumps. |
| Installing on an ageing roof | Replace the roof first if it’s nearing the end of its lifespan. |
| Overlooking shading | Arrange a professional roof survey. |
| Poor panel positioning | Choose an installer who designs bespoke layouts. |
| Not considering battery storage | Discuss current and future battery options. |
| Not checking warranties | Understand product, performance and workmanship cover. |
| Skipping the home survey | Always have a professional assessment before committing. |
Many of these mistakes can be avoided simply by working with an experienced installer who takes the time to understand your home.
At Sheerwater Solar, every project begins with a detailed survey and consultation. We assess your roof, discuss your energy usage and future plans, and design a bespoke solar system that balances performance, appearance and long-term value. Rather than recommending a standard package, we’ll provide honest advice that’s tailored to your property.
Installing solar panels should be an exciting investment, not one filled with uncertainty.
If you’re considering solar, book a professional home survey with Sheerwater Solar. Our experienced team will assess your property, explain your options and design a system that’s built to perform for years to come, helping you avoid common pitfalls and make the most of your investment.
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Reaching out to Sheerwater Solar is straightforward and hassle-free. Whether you’re interested in solar panels for your home or business in Woking, we’re here to guide you every step of the way. You can contact us directly by calling 01932 627 555 or by sending an email to info@sheerwatersolar.co.uk.
Alternatively, fill in our online form for a swift response.
What happens next?
In most cases, we’ll need to conduct an on-site survey at your property to assess the feasibility and provide you with a tailored quote. This visit allows us to understand your specific needs and explore the potential for renewable energy solutions. Following the survey, we’ll discuss the best options for integrating solar energy into your property, including detailed costs and the installation process.
We’re excited to assist you on your journey to renewable energy and look forward to hearing from you.