Mounts & Trackers

Fastening material and elevation for your solar modules

A decisive factor for solar yield is the correct positioning and alignment of the solar modules toward the sun. Installing the photovoltaic modules flat on the roof or vertically on the balcony is not advisable for optimal solar yield. That is why we offer elevation systems for flat roofs and wall facades, which set up the solar modules at a favorable angle of inclination to the high-yield midday sun. For the sloping roof, we offer our “sloping roof assembly set”. With this, the solar modules are fastened parallel to the roof surface on mounting rails

In addition to the inclination toward the sun, the elevation systems have another practical and important property: with their help, the solar modules can be easily and securely attached to the wall or set up on a flat roof. The elevation triangles are screwed firmly to the wall or facade, and the mounting rails on the flat roof variant are attached to the rafters using roof hooks. The “ValkBox” system can be easily placed on your flat roof, e.g. the garage or garden shed, without drilling a hole and only needs to be adequately ballasted with gravel or paving slabs.

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Installation, commissioning

Due to the different types of photovoltaic assembly, solar modules can be used almost universally. In addition to the widespread roof mounting, integrated facade mounting is becoming increasingly popular. If roof mounting is possible, this almost always proves to be the better option.

On-roof and in-roof installation

If a photovoltaic system is installed on the roof, there are three possible stages of integration into the building. In the most widespread variant, the so-called photovoltaic on-roof installation, the solar modules are simply mounted on the existing roof, and the roof itself remains unchanged. This type of photovoltaic installation is very simple and inexpensive and is always the most economical option if a complete roof renovation is not pending anyway. Installation costs are around $300 to $400 per kilowatt of rated power. In addition, most roofs offer the option of integrating solar modules into the roof. The photovoltaic modules replace the roof tiles and form an even surface with the rest of the roof. This is the visually more appealing variant, and it is usually chosen for this reason. The roof is sealed under the solar modules with special cover plates or foils.

Building integration and facade assembly

Building-integrated photovoltaics offer an even higher degree of integration into the building. Here the photovoltaic modules completely replace the roof. Roof tiles with an integrated photovoltaic function are offered as standard. Experiments are also already underway with elastic roofing materials, which can also function as photovoltaic modules. The first bitumen membranes with a solar function are already on the market, but there is still a lack of practical experience in long-term testing. These different ways are also possible in the case of façade installation. Here the spectrum ranges from solar modules that are simply screwed in front of the facade to solar-active facade components that also take on thermal insulation tasks.

Mounting systems for all roof shapes and roof coverings

The photovoltaic installation on roofs that have a sufficiently large flat surface with a suitable orientation is problem-free. The solar modules are anyway attached to the supporting roof structure under the roof covering, which is why the material of the roof covering is of secondary importance. The differences are more in the details since different screws and roof hooks have proven to be optimal for different materials. A special assembly device is used to fasten the photovoltaic modules, which are connected to the rafters via two rails. These rails usually run parallel on the underside. Alternatively, models with crossed rails are also available. Mounting systems with extended rails that protrude far beyond the edges of the modules are also available.

Special mounting systems are required for roof coverings, which expand more when heated. These include, for example, sheet metal and bitumen roofs. These photovoltaic mounting systems must offer a certain tolerance to allow the expansion of the material. The photovoltaic modules are rigidly connected to the bracket. If this is made of a material with excessive thermal expansion, it can tear the glass cover of the modules.

Planning and implementation

If a roof has a flat surface with a suitable orientation and slope, it is almost always possible to install a photovoltaic system. Today, special mounting systems are offered for every roof construction and every cover, all of which have been tried and tested.

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