Orientation optimisation

[klerindias]

Hello,

I imported data from PVGIS-SAF, PVGIS-Classic and from meteornom 6.

I tried to do optimization of orientation for same geo localization: Berlin.

And each tilt for each data is different why?

PVGIS-CLASSIC:

http://img832.imageshack.us/img832/8776/pvgisclassic.jpg

PVGIS-SAF(1 deg azimuth but not influence on result):

http://img203.imageshack.us/img203/1497/pvgissaf.jpg

METEONORM:

http://img266.imageshack.us/img266/6007/meteornom601.jpg

[André Mermoud]

The transposition is highly dependent on the diffuse part.

And the models for the diffuse are usually rather coarse.

However the calculations in this tool are only meant for a quick evaluation when you are choosing an orientation. They are computed very quickly using a simplified algorithm based on the Montly meteo data (calculation of 3 average days for each month). Please don't use it for accurate evluations.

The tool in "Tools" / "Transposition Factor" provides more accurate optimizations, evaluated on the basis of the hourly data, and for different conditions (different months, eventual horizon shading, etc).

[klerindias]

Hello, thanks for answer.

But now i got new ones after i read your article.

I did as you suggested Transposition Factor for Berlin.

http://img89.imageshack.us/img89/4669/berlintf.jpg

So it showing optimum about 35.5 degree.

Then i read about electrical shading effect and got like this:

http://img442.imageshack.us/img442/8718/shelltiltoptimalization.jpg

So optimum should be about: 28-29 degree with pitch same like for 35.5 degree right?

I dont exactly understand shading effect of cell 12.5 cm in 1 width, what it means?

For landscape position, it means shade on all cells in one row so just 1 submodule shaded in half (10 cells/20 in submodule, 10 cells shaded in module)

or

For portrait position, it means all submodules shaded so it would be like 2 cells/20 in submodule, 6 cells in module

or

something else?

but still dont know which case it's estimating.

my version is 5 and just using it from tool tab.

Regards.