Jump to content

Transposition factor pvsyst5 and 6


Recommended Posts


i just did for same location and same meteorological data PVGIS-SAF compare of transposition factor:



and here PVSYST6:


Why is this diffrence?

and dont know why in both examples is diffrence 1kWh/m2.

Between this 2 cases is like 2 weeks diffrence.

But even 1kWh/m2 shouldnt have so big influence on tilt?


Link to comment
Share on other sites

  • 3 months later...

In the version 5, the default transposition model is the Hay model.

In the version 6, it is the Perez model.

Now these are models (with their uncertainties), not the reality !

The Perez model is known for giving slightly higher transposed values (by 0 .. 2% according to climates, plane tilts, etc).

However please observe that these optima are very broad: a difference of some few degrees (with the same model) represent a very little irradiation difference.

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...