The Challenge At the Pflanzen-Kölle logistics centre in Wiesbaden, the building's sandwich panel facade could not support the weight of conventional glass modules (approx. 20 kg/m²). A lightweight, load-friendly solution was required.
The Solution 212 Peakup Power Dandelion lightweight modules (89 kWp) were installed on the south and east facades. Weighing just 2.4 kg/m², these glass-free, flexible modules enabled solar installation without overloading the structure.
Installation Process Substructure: Aluminium U-profiles were screwed onto the facade using brackets. A steel girder behind the insulation provided additional stability. Adhesive bonding: Profiles were sanded, then high-performance adhesive was applied. Modules were placed on the adhesive and lightly pressed. Fixing: Fixing tape was used to hold panels in place until the adhesive fully cured. Precision layout: Seven substructures per module – one at each end, five evenly distributed in between. Precise spacing prevents wind uplift and ensures stability.
Key Advantages Ultralight: Only 2.4 kg/m² – ideal for low-load-bearing roofs and facades Flexible: Suitable for curved surfaces such as barrel roofs Glass-free: Composite laminate construction with excellent cell protection Minimal substructure: Rectangular plastic pipes reduce system weight on flat roofs
Technical Details for Flat Roof Installation Modules rest on at least seven plastic pipes as substructure Pipes are sprayed with primer to enhance adhesion Adhesive applied with electric cartridge gun (approx. 10 mm bead, 3–5 mm thickness after pressing) Modules pressed lightly using a rubber roller – no primer needed on module backside Adhesion test recommended for large projects: test different adhesives on the roof for two weeks, then peel-off test by Osnatech experts
Design Considerations Maintain defined gaps: 2–3 cm at plug connections, 1 cm between back-to-back modules Connector side should face the maintenance walkway for easy cable duct installation 90% of working time is spent on preparation – installation itself is quick
Results
Facade transformed into a power plant without structural reinforcement
System suitable for flat roofs, pitched roofs (up to 8° without tape, steeper with tape), and barrel roofs
Proven durability: fixing tape dissolves after ~6 months, by which time adhesive is fully cured
