In-roof solar panels: An overview of the advantages and disadvantages of in-roof photovoltaics

Discover the pros and cons of in-roof photovoltaic systems and in-roof solar panels. Find out how this attractive and efficient solar technology can power your home with renewable energy.

What are integrated roof solar panels?

In-roof solar modules are an efficient and aesthetically pleasing alternative to traditional rooftop photovoltaic systems. They partially or completely replace the roof covering, thereby making optimal use of solar energy. The result is an in-roof photovoltaic system with a distinctive aesthetic appeal, which stands out for its high durability and energy efficiency.

Difference between rooftop and in-roof photovoltaics

Unlike roof-mounted photovoltaic systems, where the solar cells are placed on top of the existing roof, in-roof solar modules, as the name suggests, are integrated into the roof. They replace the roof tiles and lie flush with the rest of the roof. This roof integration results in a discreet and aesthetically pleasing PV system that protects against the elements and prevents moisture ingress. This type of photovoltaic system is also known as building-integrated photovoltaics, a prime example of green technology.

Advantages and disadvantages of in-roof solar panels

Advantages of integrated roof solar panels

In addition to their aesthetic appeal, in-roof photovoltaic systems offer further advantages thanks to their even weight distribution and high mechanical load-bearing capacity. The in-roof solar modules are securely mounted on rails, which are in turn firmly attached to the roof. Thanks to their flush fit with the roof, they offer little surface area for the wind to catch, even in strong gusts. Robust solar modules in particular, especially glass-glass modules, are characterised by their durability, thus ensuring reliable protection and the efficient use of solar energy.

Disadvantages of in-roof solar modules

On the other hand, the installation of an in-roof photovoltaic system is more complex and costly compared to the installation of a conventional rooftop photovoltaic system. As the in-roof solar modules replace the roof covering, additional waterproofing measures and consequently higher installation costs are required. Furthermore, the lack of clearance from the roof can impair cooling, which may lead to a drop in performance at high temperatures. It is therefore advisable to choose high-quality modules with improved heat dissipation.

Aesthetic aspects of in-roof photovoltaics

In-roof photovoltaic systems are not only visually appealing, they also contribute to a building’s energy efficiency. With their slim profile, the solar modules blend seamlessly into the roof, making the house a real eye-catcher. Windows and chimneys can also be integrated into the system without difficulty. Installation is also significantly simpler and less prone to errors compared to solar roof tiles. This makes in-roof photovoltaics a safe, space-saving and elegant-looking PV solution that sets new standards in solar technology.

Costs of an in-roof photovoltaic system

Cost comparison: Rooftop vs. in-roof photovoltaic systems

When building a new property or renovating a roof, it may be more cost-effective to install an in-roof photovoltaic system rather than mounting a photovoltaic system on the roof. There are no additional costs for roof tiles or roofing work. However, if a PV system is to be installed on an existing building, a conventional rooftop system is often the cheaper option.

Costs for new installation vs. renovation

The higher costs associated with installing in-roof solar modules are mainly due to the labour required to remove and dispose of the existing roof, as well as the special fixings needed for the solar modules. Depending on the condition of the roof, it may also be necessary to replace roof battens and beams. For this reason, it is particularly advisable to consider the use of in-roof solar modules when carrying out a roof renovation or constructing a new building. A solar installer can advise on the options and costs.

Options for installing in-roof photovoltaic systems

Suitable roof coverings

Whether an in-roof photovoltaic system is a viable option depends primarily on the roof covering. Whilst metal or bitumen roofs are unsuitable, tiled roofs are well-suited for the use of in-roof solar modules.

Required pitch

It is also crucial that the roof has a suitable pitch. For in-roof photovoltaics, this angle must be slightly greater to ensure unobstructed drainage of rainwater. In-roof solar modules are therefore only suitable for pitched roofs, whilst they are not suitable for photovoltaics on flat roofs.

The installation of in-roof photovoltaics is particularly cost-effective when re-roofing, as the roof tiles can simply be replaced with the modules. However, with an existing roof, the old roofing material must first be removed, which increases the overall costs.

Conclusion: Integrated photovoltaic systems and integrated solar modules

In-roof photovoltaic systems offer an aesthetically pleasing and space-saving alternative to conventional rooftop photovoltaic systems. They are particularly suitable for new builds or roof renovations and can help to save costs. Despite higher installation costs and potential losses in performance at high temperatures, they offer a range of benefits, including improved aesthetics, increased wind resistance and durability. Thanks to their characteristics, they help to improve energy efficiency and make an important contribution to the use of renewable energy.

FAQs – Integrated roof photovoltaic systems

1. What is the difference between rooftop and in-roof photovoltaic systems?

Roof-mounted photovoltaic modules are placed on top of the existing roof covering, whereas in-roof modules replace it and are flush with the rest of the roof. This is also referred to as roof integration of solar technology.

2. What are the advantages of in-roof photovoltaic systems?

The advantages include improved aesthetics, even weight distribution, high mechanical strength and a long service life for the modules. These aspects make in-roof photovoltaic systems an important component of green technology.

3. What are the disadvantages of in-roof photovoltaics?

The disadvantages include higher installation costs and potential performance losses at high temperatures due to limited rear cooling. In this case, it is advisable to use high-quality solar modules with improved heat dissipation.

4. Which roof types are suitable for in-roof solar modules?

In-roof solar modules are only suitable for pitched roofs with tiled roofing. They represent an important step in the use of solar energy for homes and businesses.

5. Are in-roof photovoltaic systems cheaper than on-roof photovoltaic systems?

Costs can vary depending on the circumstances. For new builds or roof renovations, in-roof photovoltaic systems can be more cost-effective. For existing roofs, a rooftop photovoltaic system is often the cheaper option. A solar technology expert can provide personalised advice on this.

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