Harnessing solar power on flat roofs: benefits and considerations
Solar energy is becoming a go-to option for both homes and businesses. While many people think of pitched roofs when they consider solar panels, flat roofs are a great, often overlooked choice. Flat roofs are perfect for solar panel installations because of their wide, open spaces. Unlike pitched roofs, flat roofs let you place panels with more flexibility, ensuring you get the most sunlight and energy production possible. These roofs are common in commercial buildings and modern homes, making them a valuable option for solar energy. By taking advantage of the unique features of flat roofs, property owners can boost their energy output and support a greener future.
Advantages of solar on flat roofs
There are several key benefits to installing solar panels on flat roofs. First, flat roofs make installation easier. They provide a stable and accessible platform, which simplifies the process compared to pitched roofs. This can lead to lower installation costs and faster setup.
Another big advantage is the ability to optimise panel orientation. On a flat roof, you can adjust the panels to the perfect tilt angle to capture the most sunlight throughout the day. This flexibility ensures you get the best energy production, no matter which way your building faces. Flat roofs also allow for larger solar arrays. Since you can use the entire roof surface, you can install more panels than you could on a similar-sized pitched roof. This maximises your available space and increases the overall energy output of your system.
Finally, flat roofs also enable efficient use of space. Solar panels can be installed without disrupting the building's look or function. This makes flat roof installations an attractive choice for both homes and businesses looking to boost their sustainability efforts.
Maximising solar exposure
To get the most sunlight on your flat roof panels, there are a few strategies you can use. As discussed, adjusting the tilt angle of the panels is crucial to ensure they receive the optimal amount of sunlight, along with selection of optimal panel orientation.
Minimising shading from nearby structures or equipment is essential to prevent drops in energy production. SolarEdge Power Optimisers can help with this by allowing each panel to work independently. This ensures that underperforming panels don’t affect the performance of the entire system. This technology provides more flexibility in panel placement and maximises energy production, even in less-than-ideal conditions.
Structural considerations
When installing solar panels on flat roofs, it's important to consider the roof's structural integrity. The roof must be able to support the weight of the solar panels. You might need to consult a structural engineer, especially for older buildings or those with questionable strength.
Roof material compatibility is another consideration. Some roofing materials, like tar and gravel or certain membranes, may need specific mounting systems to ensure proper attachment and waterproofing. You should also check if any reinforcement is needed to support the added weight of the panels and mounting equipment.
Installation methods
There are several ways to mount solar panels on flat roofs, each with its own pros and cons:
Ballasted systems use weights to hold the panels in place without penetrating the roof. They are ideal for roofs that cannot be punctured due to waterproofing concerns. However, ballasted systems might require additional roof load capacity to support the extra weight.
Penetrating systems secure the panels to the roof with bolts or screws that go through the roof surface. While this method provides a secure attachment, it requires careful waterproofing to prevent leaks and potential roof damage.
Hybrid systems combine elements of both ballasted and penetrating systems, offering a balance between secure attachment and minimal roof penetration. These systems can be customised to suit specific roof conditions and structural needs.
Roof maintenance and access
Maintaining a flat roof with solar panels requires careful planning to ensure the panels are accessible for inspections, repairs, and routine cleaning. Regular maintenance is crucial to keep the panels free from dirt, debris, and other obstructions that can reduce their efficiency.
Access needs should be considered during the installation planning stage. Walkways or designated access paths can be included in the design to make it easier to reach the panels. Regular inspections should be scheduled to identify and address any potential issues, like loose connections or new shading problems.
Regulatory and permitting requirements
Installing solar panels on flat roofs involves navigating various regulatory and permitting requirements. Building codes and zoning regulations may set specific rules for installations, such as setback requirements and height restrictions. It's important to check with local authorities and obtain the necessary permits before starting the installation. If you go with a trusted SolarEdge installer, they can take care of these (and many other) considerations for you.
Utility connection agreements are another key consideration. These agreements outline the terms for connecting the solar system to the local DNSP (Distributed Network Service Provider). Working with an experienced solar installer can help ensure that all regulatory and permitting requirements are met, streamlining the process and avoiding potential legal issues.
In summary
Flat roofs offer a unique and beneficial platform for solar panel installations, providing flexibility in panel placement, optimal orientation options, and the potential for larger arrays. With SolarEdge, you can enhance the feasibility of flat roof installations through market-leading products like our Power Optimisers, which can maximise yield performance and allow for greater flexibility in panel placement, while tools like the mySolarEdge app enable users to monitor the performance of flat panels versus tilted panels, ensuring their solar investment is working efficiently. To learn more, locate one of our trusted installers in your area or get in touch with our team now.
