Best Roof Angle for Solar Panels: What You Need to Know?

John McEvoy
August 11, 2023

Are you considering the addition of solar panels to your home and wondering about the best roof angle for optimal energy production? The effectiveness of solar panels is significantly influenced by their orientation and angle, making this a critical factor in the design of any solar energy system. In Ireland, where sunlight patterns can vary significantly across seasons, finding the right balance is key to maximising solar gain.

This blog aims to guide you through the factors that affect the optimal angle for solar panels, ensuring you make an informed decision for your home's solar setup.

What is the Best Roof Angle for Solar Panels?

The best roof angle for solar panels will depend on the specific location of your property. In Dublin, Ireland, the best roof angle is generally south-facing, with an angle between 30 and 40 degrees. This angle is best for capturing the maximum amount of sunlight, producing the best overall energy efficiency from your solar panel setup.

However, if your property is in an area with trees or other obstructions blocking the sunlight, you may need to adjust the best roof angle for optimal energy production.

Determining the Optimal Angle for Your Home

There are several factors to consider when determining the optimal angle for your solar panels. These include:


As mentioned earlier, your location plays a significant role in determining the optimal angle for solar panels. The closer you are to the equator, the more perpendicular the sun’s rays are, and the steeper the angle should be. Adjusting the angle according to latitude maximises the solar panels' exposure to sunlight, enhancing energy production.


The sun's angle changes throughout the year, so it’s essential to consider the season. For example, in Ireland, the sun is higher in the sky during summer, so a lower angle may be more optimal during this period. Adapting the angle seasonally can optimise solar energy capture year-round, balancing efficiency across changing solar elevations.

Roof Orientation

The orientation of your roof, whether it faces south, north, east, or west, can impact the optimal angle. A south-facing roof will receive the most sunlight throughout the day and may require a steeper angle to generate maximum electricity. Aligning solar panels to face the true south (in the Northern Hemisphere) ensures maximum sunlight absorption throughout the day.


Trees, buildings, and other obstructions can shade your solar panels and reduce their efficiency. Therefore, it’s essential to consider obstructions when determining the optimal angle for your solar panels. Minimising shading by carefully considering surrounding obstructions ensures uninterrupted solar exposure, which is important for maintaining high energy output.

Roof Type

Different roof types may require different angles. For example, a flat roof may require a steeper angle to ensure rainwater can run off easily.

Working with a professional roofing companies can help you to determine the optimal angle for your solar panels. Our team of experts can assess your home or business and recommend the best angle based on your location, roof type, and other factors.

Why roof angles are important for the yield of solar panels?

The best roof angle for solar panels is important because it will determine how much of the sun’s energy can be captured and converted into usable electricity. The optimal roof angle for solar panels can provide several benefits, including:

Increased Energy Efficiency

Installing your solar panels at the best roof angle will ensure you capture as much sunlight as possible. This will result in optimum efficiency and maximum energy production from your solar panel setup. Maximising energy production through optimal angling directly contributes to a more sustainable and cost-effective energy solution.

Cost Savings

Optimal energy production will save you money on energy bills in the long run. When your solar panels are installed at the best angle, they will be able to capture more sunlight and produce more energy, which will result in lower energy bills and more savings for you. The financial benefits of optimised solar panel angling are realised through reduced dependency on grid electricity and lower energy costs.

Extended Life Span

Installing your solar panels at the best angle will also extend their life span. This is because the best roof angle for solar panels will reduce the amount of stress and wear on the panels, increasing their longevity. Enhanced durability and reduced maintenance needs contribute to the long-term viability and cost-effectiveness of the solar panel system.

The Best Roof Angle for Different Types of Roofs

No matter what type of roof you have, they can help you determine the best roof angle for your solar panel setup. Here’s a look at the best roof angles for common roof types:

Flat Roofs

A flat roof is best suited for a south-facing 30 to 40-degree angle. This will allow the solar panels to capture the maximum amount of sunlight and produce the best overall energy efficiency. This angling strategy is pivotal for flat roofs to compensate for the lack of natural inclination, ensuring effective solar energy capture.

Low-Pitched Roofs

Low-pitched roofs should be angled between 20 and 30 degrees for the best results. If the angle is too shallow, the solar panels won’t be able to capture enough sunlight.  A careful balance between angle and roof design maintains aesthetic appeal while optimising energy production.

High-Pitched Roofs

A high-pitched roof should be angled at around 40 to 50 degrees. This will allow the solar panels to capture the sun’s energy best and produce the best overall energy efficiency.  This steeper angle aligns with the roof's natural slope, enhancing solar panel performance and integration into the roof's design.


To wrap up, optimising the roof angle for solar panels is important for energy efficiency. In Ireland, considering latitude, seasonal sun angles, roof orientation, and potential obstructions is essential for peak performance. Properly angled solar panels enhance energy production and offer significant cost savings. HP Roofing specialises in ensuring your solar panels are ideally positioned to harness the maximum amount of sunlight. With our expertise, we provide customised solutions tailored to your specific needs, ensuring your solar investment yields optimal results. Reach out to HP Roofing today and let us guide you towards a more energy-efficient future with ideally positioned solar panels.

Contact us today!

HP Roofing is a team of residential & commercial roofing contractors and solar panel installation experts in Dublin. We offer a wide range of services, from roof repairs and replacements to solar PV installations and maintenance, with quality beyond expectations.
Call HP Roofing 01 453 3366

Frequently Asked Questions

Why does the roof angle matter for solar panels?

The roof angle determines how directly the solar panels face the sun. A more direct orientation means the panels can capture more sunlight, converting it into more electricity, thus improving the efficiency and overall energy yield of the system.

If my roof isn’t facing south, is it still worth installing solar panels?

While south-facing roofs in the Northern Hemisphere (like in Ireland) are typically the most optimal for solar energy production, solar panels can still be efficient on east or west-facing roofs. The energy yield might be slightly reduced, but it's still a viable option, especially with advancements in solar technology.

Is it possible to adjust the angle of solar panels after installation?

Some mounting systems allow for adjustability, which can be beneficial to change the tilt based on seasonal sun positions. However, frequently changing the angle might not be practical for all homeowners, so it's vital to find the most optimal angle during installation.

How does the sun's path affect my solar panel's efficiency?

The sun's path changes depending on the season. In summer, the sun is higher in the sky, whereas in winter, it's lower. The roof angle should ideally capture the most sunlight throughout the year. Therefore, the angle should be optimized for the sun's average position over different seasons.

Are there any tools or services that can help me find the best angle for my solar panels?

Yes, various online solar calculators and software tools can help homeowners estimate the best angle based on their location. Additionally, professional solar installers, like HP Roofing, typically conduct site evaluations to determine the most optimal angle for installation.

Besides the roof angle, what other factors can impact the efficiency of solar panels?

Many factors can influence solar panel efficiency, including the quality and type of solar panels, ambient temperature, shading from nearby structures or trees, and the cleanliness of the panels. Regular maintenance and ensuring the panels remain free from debris and dirt can also significantly impact their efficiency.

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*FYI, parts of this blog post were drafted by artificial technlogy. But rest assured, it's been thoroughly researched, edited, reviewed and me & my team.
Founder @ HPRoofing

The founder of HP Roofing, with years of industry experience, providing top-notch roofing and solar panel services for residential and commercial properties in Dublin, delivering high-quality and customised solutions that combine both aesthetic appeal and durable functionality.