Novel PV system design for green rooftops from France – pv magazine International

French startup Ecovégétal has developed a PV system configuration that uses vegetation to reduce the operating temperature of the modules. It says the presence of certain plants on a flat rooftop can even serve as a bulwark against the risk of fire.
Image: Ecovégétal
From pv magazine France
France’s Ecovégétal has released Héliovert, a PV system for green rooftops that combines solar power generation and urban gardening.
“The idea of ​​exploiting the synergy between these two technologies came from a study currently being carried out by Cerema, a French public agency for developing public expertise in the fields of urban planning, in Nancy,” Pierre Georgel, the CEO and founder of the green roof specialist, told pv magazine France.
The new system is the result of several years of research under the PROOF project, which aims to assess the energy contribution of a green rooftop to the electrical efficiency of a solar panel.
“The first results show an increase in electricity production yields of 8 to 10% thanks to the presence of vegetation which acts as a thermal regulator under the photovoltaic panels,” said Georgel. “But it goes much further than putting lawn on a roof. It is indeed the vegetation that serves as ballast for the solar panel fixing system.”

In the proposed system configuration, drains known as XD20, DK20, or equivalent are laid over the entire surface of the roof and serve as an anti-root sealing system and for the retention of rainwater at a rate of 7 liters per square meter. A recycled plastic slab is installed on top.
“This slab will serve both as a water drainage basin and as fixing support for the aluminum frames inclined at 15 degrees on which the photovoltaic panels are installed,” Georgel said. “It is therefore not necessary to drill into the roof structure.”
A substrate known as Saxalis 1.1,  which is non-flammable and is based on mineral aggregates enriched with organic matter, is then spread over the roof. Finally, the company plants flowering meadow-type vegetation that can change color with the seasons. The plants are chosen for their high evapotranspiration, which lowers the temperature on the roof by several degrees, especially in hot weather.

According to Georgel, the presence of certain plants on a flat rooftop can even serve as a bulwark against the risk of fire.
“Finally, we are witnessing the return of biodiversity to the urban environment. Local fauna such as birds and pollinating insects and the reintroduction of flora adapted and resistant to its environment,” he said.
Ecovégétal chooses solar modules and its partners according to customer preferences. The panels can be oriented south or east-west, depending on the geographical area and the biodiversity. Beforehand, the thickness and the dry weight of the substrate – that is to say, the weight of the earth and the vegetation in the event of severe drought – is the subject of a study to ensure the resistance of the solar panels to the wind.
The Broue-based company’s first projects include the roofing of Bosch’s offices in Saint-Ouen, coordinated by Metropolis Architectes Associes. An area of 990 square meters will be planted and 790 square meters will be covered with 395 solar modules.
This content is protected by copyright and may not be reused. If you want to cooperate with us and would like to reuse some of our content, please contact:
More articles from Gwénaëlle Deboutte
Please be mindful of our community standards.
Your email address will not be published. Required fields are marked *

By submitting this form you agree to pv magazine using your data for the purposes of publishing your comment.
Your personal data will only be disclosed or otherwise transmitted to third parties for the purposes of spam filtering or if this is necessary for technical maintenance of the website. Any other transfer to third parties will not take place unless this is justified on the basis of applicable data protection regulations or if pv magazine is legally obliged to do so.
You may revoke this consent at any time with effect for the future, in which case your personal data will be deleted immediately. Otherwise, your data will be deleted if pv magazine has processed your request or the purpose of data storage is fulfilled.
Further information on data privacy can be found in our Data Protection Policy.
Legal Notice Terms and Conditions Privacy Policy © pv magazine 2022
This website uses cookies to anonymously count visitor numbers. View our privacy policy.
The cookie settings on this website are set to “allow cookies” to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click “Accept” below then you are consenting to this.


By admin

Leave a Reply

Your email address will not be published.

No widgets found. Go to Widget page and add the widget in Offcanvas Sidebar Widget Area.