Two patented technologies that work together: a solar roof that replaces the roof itself, and energy storage that runs on compressed air.
Technology · Solar roof
Our patented solar roofing system replaces the roof itself. Modules, frames and cabling form a single watertight assembly: no exposed cables, no wiring errors. Pick the modules, and mix them on the same roof.
Three steps: a galvanized steel structure, the modules laid on top of it, and the connections that link them.
A galvanized steel structure is fixed over the roof first. Once the modules are in place, it is hidden from view.
The photovoltaic modules are laid edge to edge on the structure and wired together.
Each module plugs into the rail through dedicated connectors, so the electrical link is made by the assembly itself.
A ferritic stainless steel frame, with an expansion rate close to that of the module glass, is bonded to it with a flexible adhesive for exceptional mechanical strength. The steel also resists corrosion, so the roof suits seaside and industrial sites without losing its looks.
Steel conducts little heat and the photovoltaic surface is airtight. On a blind façade it forms a ventilation column that can be closed at night as an insulating air layer. A 2013 study estimated up to 60% less summer heating and up to 40% less winter cooling.
The assembly is airtight and watertight. Air warmed behind the modules can be drawn off at the top of the roof and fed into the building’s dual-flow ventilation, recovering energy that would otherwise be lost.
Independent tests with 225 km/h gusts and pressurized water showed no leak up to 2,500 Pa and no plastic deformation at 3,000 Pa. A simulation at 5,400 Pa, equal to a 340 km/h wind, is above Eurocode requirements.
Prefabricated in the factory, so quality does not depend on the installer. In a fire, the cables inside the frames short-circuit as their insulation melts. Diodes can be replaced without removing the panels, and anti-theft screws come in the kit.
Stainless steel emits 6.15 kg of CO₂ per kg, against 8.24 kg for aluminum with 33% recycled content. An installed m² needs about 4 kg of stainless steel and 4 kg of galvanized steel. Steel recycles indefinitely, and glass, about 80% of a panel’s weight, is recycled too.
Protected by several patents: our modular roofing systems in all their configurations, including all the connections and, for some models, the inverters, with more filings under way.
Request the technical fileTechnology · Energy storage
Our patented compressed-air storage system serves single-family homes as well as large industrial installations, and each system is custom-designed to its requirements and performance targets.
Solar and wind are intermittent and unpredictable, vary with the seasons and are rarely in line with demand. Storage is therefore a key technical issue for the future of clean energy. Batteries are the only viable solution today, but compressed air is an advantageous alternative.
Technologically simple, and very attractive for sites far from power grids that need a reliable, long-term energy solution.
Electricity becomes compressed air, waits in the tanks, then comes back when it is needed.
Illustration. Example of an installation for industrial needs only.
Three blocks work together: the energy input, the compressed air storage and the power generation.
Illustration. Example of an installation for industrial needs only.
Electricity from the solar panels drives the compressor, which turns electrical energy into pneumatic energy by compressing air.
The two large black cylinders hold the energy as compressed air, for when production exceeds consumption. They play the role of the battery in a conventional electrical system.
To recover the energy, the compressed air is released and expands. The expansion produces a mechanical movement that drives an electrical generator.
By combining the fluid-dynamic properties of air and the efficiency of the compressed air motor, electrical energy is stored in the form of compressed air, then reused when it is needed.
The air leaves the engine at −60 °C. This cold can be used to refrigerate premises or production machinery.
Injection into the grid can be programmed and spread over time, for “power” or “energy” services, contributing to the quality and safety of the electrical system.
Compressed air can be drawn on demand to supply users.
The valves let ambient air enter the cylinder when the pressure inside falls to atmospheric level or below, so only the bare minimum of compressed air is injected. This reduces losses during expansion.
The higher the inlet air temperature, the higher the efficiency of the engine. Losses from many industrial processes can be reused to produce more energy.
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