Solar Roof Tiles

Video: Solar Roof Tile Full Hybrid (FH)


The systems which are currently available on the market include a further receiving system which is typically installed (raised) on a roof already covered with roof tiles, which then receives panels (solar power or solar heat). The "disfigurement" and the insufficient use of the roof surface are (in addition to the installation costs of such a "double roofing") the serious disadvantages of this system. The usage of a solar roof tile instead of a "normal" roof tile is a quite obvious solution. However, it requires a very efficient design to be able to mount these solar roof tiles quickly and easily on the existing roof battens with different lath spacing. It also requires a roof system, which guarantees the supply and discharge of the fluid (in case of solar heat) and electricity (in case of solar power - also called photovoltaics). We are developing these solar roof tiles and roof systems and have patented them in different patents. Our solar roof tiles have the same dimensions and the same weight as comparable roof tiles made of clay, but are considerably more stable, more durable, walkable and storm-proof. 


Solar Roof Tile.NRW - Decentralized power and heat supply made in NRW

This project is funded by the European Regional Development Fund (EFRE).

Project partner: University of Applied Sciences Cologne

Solar Roof Tile Mild Hybrid (MH)

The solar roof tile MH combines photovoltaics (electrical energy production) with solar thermal energy (thermal energy generation) through the formation of an air duct, which arises as a result of the overlap of the individual solar roof tiles. At the same time, this air duct ensures ventilation and thus cooling of the solar cells, which increases the efficiency of power generation and the life of the cells. With a heat pump the heated air can be used for domestic water heating or underfloor heating.

The solar roof tile MH can be laid in a conventional way and replaced quickly and safely. The solar cells are not visible from the outside, which preserves the look of a normal house roof.

The specific rated output is extremely high at 150 W/m², so that for a capacity of 10 kWp (STC) only 66 m² of roof area are required. The rest of the roof area is covered with inexpensive complementary roof tiles.

Because of the small module format, even rugged roof areas can be optimally utilized and shading can be compensated significantly better.

The solar roof tile MH can be designed in different designs and colors.



Advantages of the solar roof tile MH:

  • Optical impression of a normal roof (solar cells are not visible)
  • Ventilation despite roof integration
  • High power density
  • Optimum roof utilization
  • Very good shading compensation
  • Solar roof tiles are walkable
  • High safety thanks to switching off at module level
  • Many colors possible, thanks to new multilayer coating
  • Long life thanks to glass/glass construction
  • Defrosting function for areas with snowfall
  • Optional waste heat utilization of the solar roof tile via heat pump

With the solar roof tile MH we are currently in the prototype phase. At the Intersolar Europe trade fair in Munich, we presented this solar roof tile variant to the public for the first time. For the further development up to the serial production we are looking for additional investors and partners. If you would like to promote this project together with us and lead it to success - then we look forward to hearing from you:



Solar Roof Tile Full Hybrid (FH)

Copyright: RheinEnergie


The solar roof tile FH combines photovoltaics with solar thermal energy using a fluid that cools the solar cells and whereby the heating system can be directly supported.

The chain of tiles with "snap-in system". Astonishingly easy and quick to use is the "snap-in system", with which a roof can be covered just as quickly as a roof with normal roof tiles. Due to the length variability, the tiles fit to the normal slat dimensions (the distances of the slats vary by up to 10% depending on the length of the roof and the number of tiles, so that an integer number of tiles can be covered uncut)

Performance data for a solar roof tile FH:

  • 4 wafers (12.6 cm x 12.6 cm) each with 0.6 volts MPP voltage and 4.1 watts peak
  • 1 absorber (33 cm x 30 cm) with heat exchanger
  • thus 16.4 watts peak electric per solar roof tile (STC)
  • thus 30 watts peak thermal per solar roof tile*                                  (*at 50 degrees Celsius temperature difference and 1000 W/m² irradiation)
  • Visual dimensions of the solar roof tile at maximum coverage:                  30 cm wide, 36 cm long / high
  • A roof side of a saddle roof of a "typical"single-family house with 12 m roof width and 7.2 m stretched roof length/height would have:        40 tiles in width and 20 tiles at maximum coverage in height, so in sum 800 solar roof tiles
  • the electric power would be 13.12 kW peak and
  • the thermal power would be 24 kW peak

This energy yield in photovoltaics is actually achieved with the paXos solar roof tile FH, while conventional systems degrade in summer from 25 degrees Celsius with about 0.4% per further degree of heating, ie. often bring significantly less yield.



Note 1: As a kind of "hidden performance", the paXos solar roof tile FH offers a much cooler attic in summer, which in turn requires no or significantly less air conditioning power.


Note 2: The performance data for the roof refer to a roof without dormer, skylight, antenna mast or similar.

However, such "yield-reducing" elements are less problematic with the paXos solar roof tile FH than with conventional panels because these elements can be bridged and need not be recessed with the area of an entire panel (or several).


Note 3: If in summer the photovoltaic is cooled to an optimum of 25 degrees Celsius in order to have the maximum yield, it will be cooled with a patented "cooling chimney" - more on that under the cooling chimney tab. But that would also mean that the yield in solar thermal energy would be correspondingly low. This can be remedied / changed by three things.

  1. The last three to five tile rows could be designed with pure solar thermal roof tiles for "reheating"
  2. A controller which deliberately allows a higher temperature (less cooling) for the charge of the buffer for some time
  3. Additional heating with electricity in case of need (for showering, etc.)

Which of the three options (sometimes in combination) are used depends on the individual needs and the orientation of the roof surface.


The solar roof tile FH is in the prototype phase and is currently being tested for industrialization together with our partner RheinEnergie.