The idea of the photovoltaic tile comes from the restructuring project of Acquabella's castle, in the forest of Vallombrosa in Tuscany. When the castle has been built the roof has been realised with tiles of dimentions and that were able to face cold winters and strond winds and that now are particularly able to face the much more frequent climatic emergencies. The actual idea wants to conjugate to tradition and modernity: in fact it is usually used a tile that has demonstrated a great stability for its own simple but intelligent system that permit to link one to another, moreover it keeps visually te tradition of the roof and now it is binded together to a source of clean energy. Two kind of tiles cames from this idea, the model DF2 is similar to the alpine type and the model DF3 that is similar to the portoguese type.
These kind of tiles are of greater dimentions compared to those one that are in commerce (even if they have the same medium weight) and they have on the external face a little photovoltaic panel discrete dimentions, modular together to the others and almost invisible, differently from the products actually in commerce. The most important characteristic of the DF1 and DF2 tiles is that they can be used without the application of the photovoltaic panel as well, its application can be made in a second time without problem. This system permit rapidly the maintenance and the eventual replacing of the panels with others, with better characteristics, that the new technology will be able to offer in future, keeping the same tiles as support. The application field for this kind of tile is usually valid for every kind of roof, but it is necessary to have a particular attention in studying the evaluation of the shadows, to make a good cabling of the diodes among the tiles linked in series. The little panels can contain 4 cells from 2 Wp per cell of the Isofoton ( see photo ) tot. 8 Wp , or 4 cells from 3 Wp per cell of the Sunpower per un total of 12 Wp.
Components of the panel:
Frame: tile type DF2 with dimentions h 46 L 39 Cm
Telaio: tile type DF3 with dimentions h 46 L 43 Cm
Terminazione: class inverter suitable with the implanting
Glass: frontal cover glass with high trasmittanza 3 mm hardened
Rear cover tedlar polyester chassis encapsulating etilvinilacetato
Anchor system to the coverage : typical of the tiles during the certification phase
Technical characteristics photovoltaic modul: type DF2
Characteristic for 9 moduls linked in series
Dimentions: h = 295 mm, l = 280mm, w = 4 mm
Composition: 36 cells from 125 mm X 125 mm
Performances: typical power 75 w
Minimum power 72 w
Lost motion load 21.5 V
Icc 4.8 A
Max power load 17.5
I max power 4.3 A
Max load of the system 735 v
Operational temperature -40/+85
Clay tile of big dimentions, with a low visual impact on the photovoltaic panel contained in itself.
This kind of tile is mounted as a normal kind of tile, and it is possible to obtain a really steady roof and, subsequently, it is possible to insert the photovoltaic panel, to reach the maximum extension of the roof.
With this kind of tile it is really simple to make maintenance operations, substitutions of broken panels, or substitutions of panels from a type to another one (e.g. to skip from a 8 Wp panel to another one of 12 Wp, or they could be replaced with panels technologically much more advanced in future).
Ultimately this kind of roof permit a good modularity, a low visual impact, but it is needful a good project, with a peculiar study about the shadows, foreseeing before the pose, the connecting cables as well.
Actually there are two types of tile, the third one is under test.
The DF2, model with dimentions 46 x39 cm, see model with dimentions 46 x39 cm, is a joint tile on the centre line, very steady, with a low visual impact, and it requires a great amount of special parts.
For this model 7.5 tiles per m2 are required.
The DF3 model with dimentions 46x43 is instead similar to the Portuguese tile and the inserted panel is much more visible.
For this model 6.75 tiles per m2 are required.
The positive aspect of this kind of tile is the fact that it is able to sustain panels that can be substituted during the lifetime of the roof with panels of the same dimensions but with better performances, without more supports, changes of tiles or twisting of the roof itself.
Our tiles are built with natural clays of the Po plain,without adding of muds or industrial addictive, and cooked to the temperature of 980° C