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FAQ

Frequently asked questions

autarq solar roofs are especially safe. A particular feature is that they operate in the low-voltage range and protect users from dangerous electric shocks. This is made possible by connecting the solar cells in parallel. Roofers and the fire brigade can walk on the roof without any concerns. Conventional photovoltaic systems, however, require special fire protection measures.

For autarq solar roofs, no building encumbrances have to be registered for fire protection purposes.
There’s an emergency stop switch on the inverter.

It’s no longer essential that your roof faces south. The autarq technology has significantly improved energy yields. South-facing roofs are, of course, ideal, but east- and west-facing roofs are now also highly suitable. It’s recommended that the roof is no steeper than 45° so that it can utilise as many hours of sunlight as possible.

If you’re using your own electricity, there’s even a decisive advantage in covering an east- and west-facing roof because the electricity is generated much more evenly over the course of the day than with a purely south-facing roof. Although the latter produces a high yield peak at midday, most clients are not able to use it at all.

North-facing roofs can also be used if they are gently pitched.

autarq will be delighted to provide you with a yield forecast for your individual roof area based on your system data. You will be given a basis for deciding which roof areas seem worthwhile.

No, the risk of a direct lightning strike is not increased. The general rule for all solar power systems is that the cables in a “mesh” should be routed as close together as possible to reduce indirect hazards from induced voltages caused by lightning striking nearby. The smaller the “mesh”, the lower the risk. The fact that the plus and minus wires in the autarq wiring harness are kept no more than 15 mm apart is another advantage here. The mesh is therefore extremely small and minimises hazards much more than with conventional solar power systems.

Here, the autarq technology has a clear advantage over conventional solar power systems and enables significantly higher energy yields. autarq solar roof tiles are connected in parallel, unlike conventional solar power systems. There the modules are electrically connected in series – which means that even small shadows can have a major impact on the entire system, i.e. especially on the unshaded areas. In the autarq system, the solar tiles are connected in parallel and work independently of one another. The shaded areas therefore have no effect on the unshaded areas.

Most shadows are “shifting” shadows and change with the course of the sun. If, for example, 20 solar tiles are always shaded across an area with 500 solar tiles, the 20 tiles shaded in the morning will be different than those shaded at noon, and those shaded in the evening will in turn be different from those shaded at noon. With a conventional solar power system, the entire area with “shifting” shadows would be largely disabled. Bei der autarq Anlage führt dies lediglich dazu, dass die Anlage über den ganzen Tag konstant mit 480 Ziegeln, d.h. mit 96% ihrer Leistung arbeitet.

Such projects are not supported by autarq for good reasons. Only tiles from one system guarantee a solid and functional roof covering. Furthermore, mixing tile shapes does not go along with the underlying aesthetic concept behind autarq solar tiles. It would usually lead to higher costs for the client due to the increased complexity of connecting different roof surfaces.

A special feature of the autarq solar roof system is that it can be installed in the usual manner by the roofers. As soon as the cable harness has been laid by autarq, the rest of the work can be completed by the roofers. The transfer point is provided by the PV converter (preferably under the roof). All cables from the roof are routed there. If desired, the electrician doesn’t need to come until a few weeks later and can then carry out his work (connecting the inverter and battery). Roofers and electricians don’t have to be present at the same time!

Yes. The rows of solar tiles can be interrupted at any point with corresponding special tiles. The wiring harness simply runs past them accordingly. The tiles to the left and right are connected to the cable harness as usual.

Remove the old tile and unplug the cable. The 40 cm cable length provides enough slack. Then insert the cable for the new tile and install it like a standard tile, i.e. push it under its neighbouring tiles so that the interlocking sections slot together.

Yes, because the autarq solar roof tiles use precisely these standard tiles with the same interlocking system, etc. as their basis. The only difference is that a solar module is attached to their top side. The cable is fed through the rear side behind the glass pane and this is absolutely watertight.

Yes. However, due to the glass panes used, solar tiles are more slippery than normal tiles when wet. You shouldn’t rest roof ladders directly on the glass panes. For protection purposes, it is sufficient to use padding such as wrapping the ladder with fabric at the support points.

There are no limitations compared with standard tiles. The solar tiles have exactly the same functionality as the standard tiles. In fact the solar modules, which are made of specially hardened glass, already meet the highest hail protection class 5.

No. If snow lies on a solar tile, it doesn’t produce electricity but is otherwise fully functional. When the PV module is exposed to light and thus generates a slight amount of heat, the snow will usually melt more quickly.

It’s widely known that solar power systems perform less well the hotter they are. The dependency amounts to approx. 0.4% per °C. The reference value is 25°C. Since roofs can heat up to 80° in summer, this means that they deliver 55 x 0.4% = 22% less power on these days than they would theoretically deliver with the same irradiation and 25°C. This is perfectly normal and is the same with all solar power systems.

The question now is whether or how much hotter roof-integrated (solar tile) systems get compared with rooftop solar systems where the modules are mounted about 10 cm above the tiles. According to our measurements, the temperature difference on normal (sunny to cloudy) days is about 5-10°C, so the 2-4% difference is hardly significant. A temperature difference of 10-20°C can be measured on very sunny and hot days (in Germany that’s a maximum of 50 days per year), i.e. the system produces a maximum of 8% less yield. For systems that generate their own electricity, this difference is completely irrelevant, because on these days at least 150% of the required electricity is normally generated.

The adhesive is UV-resistant and has been used in the solar and building materials industry for many decades. It has TÜV approval and meets the EOTA ETAG 002 requirements for structural sealant glazing kits. The bonding is at least 50 times oversized. According to the available climate chamber tests and our calculations, the bond will last at least 40 years.

Monocrystalline solar cells from various leading manufacturers are used with efficiencies between 20% and 22%. autarq always utilises leading technology.

There’s 100% output control, i.e. all solar modules are measured on a “flasher”. The flasher emits a flash of light that is modelled on the solar spectrum. During the flash, the solar module’s entire power curve (approx. 200 measuring points) is traversed. Based on the curve, it’s possible to read off the solar module’s output (maximum power point) as well as identify abnormal features. Abnormal solar modules are rejected.

No, not normally. The glass has a textured surface (prism refraction) that refracts the light in different directions. In addition, the viewing angle on roofs is usually very flat and therefore, in contrast to (vertical) façades, there are no reflections or glare effects towards the viewer.

Your electrician can answer this question. You will probably have to rewire older junction boxes (50 years or older), because they no longer comply with the latest regulations. Until now they will have been “grandfathered”, i.e. exempt from new regulations, but connecting the solar power system requires an intervention. As a result of the intervention, the junction box loses its grandfather status and may therefore have to be adapted to the new regulations.

The sizing of your battery storage unit depends in particular on your electricity consumption – and of course on the size of the solar power system on the roof. Normally, for smaller systems <10kWp, a good rule of thumb is to make the battery storage unit about the same size in kWh as the solar power system in kWp. <

The batteries must be installed in a cool, dry room, ideally with a temperature between 5 and 25°C. The inverters should be installed as close as possible to the batteries. Fire safety regulations apply to the installation (for example, do not mount on a wooden wall). Since the units also generate waste heat, suitable air circulation may have to be provided. The units must not be installed in escape routes such as stairwells.

Due to the aforementioned requirements, we recommend using a plant room in the basement or garage. In very few cases is installation in the attic sensible or permissible.

The battery storage unit has two tasks: storing the solar power during the day and making the solar power usable during the hours of darkness. Especially on cloudy days or when the weather is rather “unsettled”, the solar power can fluctuate strongly and quickly, and in the late morning or early evening it can still be weak. In all these phases, the battery “backs up” the power coming from the solar radiation and so considerably extends the hours that can be used per day.

During darkness, i.e. especially later in the evening or earlier in the morning, the electricity then comes entirely from the battery. This is because more electricity is usually generated during the day than is needed and can therefore be used later.

The battery storage unit is not a seasonal storage system. It is therefore not suitable for storing electricity in summer and then using it in winter.

Your house always remains connected to the electricity grid (grid parallelism). When the sun shines, the power generated is used primarily to cover consumption in the house. For this purpose, the inverter is equipped with a measuring device mounted in your meter cabinet. For example, if 3kW are currently coming from the roof and you are consuming 1kW in the house, the remaining 2kW are used to charge the battery. If the battery is already full, the surplus 2kW is fed into the grid. Conversely, if for example 2kW come from the roof and 3kW are needed in the house, then 1kW is “added” from the battery. If the battery is already empty, 1kW is drawn from the grid.

As with every modern solar power system made of crystalline solar cells, the relevant physical values are used as the basis here. Accordingly, it can be assumed that the system loses a maximum of 0.5% of power per year. The technical term for this is degradation.

autarq solar tiles have the advantage that– unlike standard solar modules – they do not require an enclosing frame in which dirt can collect. It’s not normally necessary to clean roofs with pitches greater than 20°. The system always cleans itself when it rains.

However, cleaning may be advisable with gentler roof pitches or with roofs close to, for example, industrial plants with increased air pollution. example, industrial plants with increased air pollution. This should only be done with water and very soft brushes. There are companies almost everywhere in Germany that offer such cleaning services.

The solar power system must be registered with the grid operator. Before installation, a “grid request” must be submitted and, after installation, a notification of completion must be completed. In addition, in Germany the system must be registered with the Federal Network Agency.

No, an autarq roof neither raises nor lowers the temperature in the house.

PV system: no
PV converter: no
Inverter: A quiet fan similar to that of a laptop switches on at higher power levels.

Battery: no

autarq assumes liability and warranty for the solar tiles’ ability to function as roofing and provide solar power. The roofing company carrying out the roofing work assumes liability and warranty with regard to the roof’s proper installation and its resulting ability to function as such.

autarq solar tiles are manufactured according to the state-of-the-art methods used in the solar industry with the same familiar materials and manufacturing processes that have been tried and tested a million times over with conventional crystalline solar modules. The raw materials are sourced from certified and monitored suppliers. Compliance with our manufacturing processes is based on strict quality criteria and continuous controls in our production. Our solar tiles are tested and certified according to the two standards IEC 61215 (longevity and durability) and IEC 61730 (safety). Many years of experience in the solar industry show that solar modules manufactured and tested in this way lose a maximum of 0.5% power per year (degradation).

The degree of self-sufficiency provides a good indication when sizing economically viable systems. A value between 67% and 75% is within a window that is particularly economical.

The costs for purchasing electricity are generally rising. It’s therefore more attractive to use the energy you generate yourself instead of having to purchase it. Therefore, the principle of self-consumption takes precedence over feeding electricity into the grid because this creates the desired self-sufficiency.

Yes, you can feed electricity into the grid at any time. When you’re on holiday or away, the self-produced energy first supplies the house, which requires a certain basic load (household appliances such as refrigerators and freezers, etc.). The surplus is automatically fed into the grid.

PVGIS is the abbreviation for Photovoltaic Geographical Information System. The information system is developed and made freely available by the European Commission’s Joint Research Centre. It therefore provides reliable data. To ensure that you also realise the values on which our calculation is based in “shadier years”, we’ve included an additional rebate of 4%.

Yes. The inverters for the autarq solution are prepared for operation with battery storage units.

It takes only a few hours longer to clad a roof with solar tiles than it would with conventional tiles. During the installation you will continue to have electricity provided by your electricity supplier as usual.

The autarq system is maintenance-free and does not incur any running costs.

Houses with attractive roofs and smart energy solutions fetch higher prices than houses with simple roofs or with conventional PV modules. Potential buyers sometimes decide against buying houses with conventional PV modules for aesthetic reasons.

autarq solar tiles are connected in parallel and are operated in the low-voltage range. This makes them particularly flexible in use and also very safe for installers (roofers) and house occupants. A PV converter is needed to make the low voltage usable for conventional solar inverters. It’s mounted under the roof and raises the voltage accordingly. Here we also take safety very seriously: Automatic monitoring enables the PV converter to switch itself off independently in the event of danger. The PV converter is practically the interface between low-voltage and usable household electricity.

While autarq solar roof tiles operate in the protective low-voltage range and the current is only converted at the PV converter interface, conventional solar modules are electrically connected in series and are under high voltages.

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