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How are Lumeta modules attached to the roof?
Lumeta modules are adhesively applied to roof surfaces utilizing a revolutionary design. The installer simply removes the release sheet on the back of the module, exposing the adhesive pads, then places the module in the desired location and applies pressure. After applying 40lbs of pressure over the surface, the module is now fully adhered.
Are Lumeta modules a BIPV product?
No. The term BIPV, or building integrated photovoltaics, refers to products that act as part of the building’s envelope. Lumeta’s modules are designed to install on existing roofing materials and they do not replace any part of the roofing surface.
Are Lumeta modules a thin film product?
No. Lumeta modules use monocrystalline silicon solar cells, the same type used in most traditional solar modules. The difference with our module is in the front sheet and back sheet materials, as well as the elimination of the frame and separate mounting structure. Lumeta modules use high quality, high efficiency black solar cells that provide better aesthetics.
Do Lumeta modules damage the roof?
No. Lumeta modules are designed to be compatible with composition shingle and tile residential roofs and most types of flat and low slope commercial roofs. In fact, they are less likely to harm the roof than traditional solar PV systems. By eliminating racking, there is no need to drill holes in the roof to attach the system. Plus Lumeta systems are half to one-third of the weight of traditional glass-fronted, rack-mounted solar PV systems, putting less structural load on the roof compared to traditional or ballasted commercial systems. The adhesive bonds to the roof surface, but will not compromise the integrity of the roof system, even if the modules are removed.
Can I remove a module?
Yes. Lumeta modules can be removed using a PVC heat blanket heated to a temperature of 290°F. Lay the heat blanket on the module for approximately 5-7 minutes and then ease the module off. If the module is being replaced, simply apply the replacement module in the same area, using additional adhesive tape if needed. If the module is not being replaced, once the module has been removed, granules can be spread in the areas where adhesive is still present and the areas will blend in with the roof. For more detailed information, attend one of our installation webinars.
How does the module handle heat?
Lumeta modules are specially designed to shed heat through their ETFE front sheet, allowing maximum heat dissipation while being mounted directly on the roof surface. Underneath the module, the gaps in between shingle and tile rows allow air to flow around the module, providing additional cooling. Our studies have found that only 2% of power output is lost compared to glass-fronted modules on rail-free mounting systems.
Do Lumeta modules need to be grounded?
No. Lumeta modules do not have a metallic frame, and are installed using all non-metallic components. Installers still need to be aware of grounding requirements under the NEC and their local AHJ to ensure code compliant installations. All the associated non-current-carrying conductive materials associated with the overall PV system still need to be connected to earth.
How long does the adhesive last?
The adhesive used has been tested and is rated to last the lifetime of the system, 25 years or more. The butyl adhesive is commonly used in roofing systems and other long-lived external applications.
Can I install Lumeta on a shed / RV / boat / other structure?
Where code allows, the module can be installed on sheds or other structures that use traditional roofing materials such as composition shingle, concrete tile, or other acceptable commercial roofing materials. It has not been tested for other applications and the warranty does not cover use on non-traditional surfaces.
Can I bend the modules or put them on a curved surface?
It depends. The Lumeta modules has a semi rigid back sheet that allows for a small amount of variation in the surface it is applied to, however it is not designed for a significant curve. Tests have shown that it can maintain a bend of up to 15 degrees without damaging the cells.
Can I walk on the Lumeta modules?
No. While we have done extensive robustness testing and find that the modules are likely to withstand impacts that would damage glass modules, we do not recommend walking on the modules. Like all monocrystalline silicon solar cells, excessive point loading and bending of the cells can create stress fractures which can lead to hot spots and performance issues.
Do you need to leave a gap between modules? If so, how much?
Yes. We recommend leaving between 1/8' and 1/4" gap between modules to allow for thermal expansion and contraction.