[TRNSYS-users] Radiation; tilted surface

[Sancho,Fernando]

Hello,
I´m having some problems with the radiation data. Using the same source and,  theoretically, the same estimation models there are big differences in the results for a tilted surface between TRNSYS and the other software  we normally use, specially in winter. 
I´m using Type 16, reduced estimation from Reindl to calculate diffuse and beam components and Hay and Davies model  for tilted surface, supposed to be what the other software use. 
But basically I find  a very little change between the two different sloped surfaces , 0º and 45º. We are supposed to get much more in percent in Winter when we have a sloped surface, don´t we?  
This are the results. Latitude 52º

                      TOTAL                           kWh/m2 months
Horizontal       1011.     18.8     32.1     67.3     112.7   152.3   150.4   160.9   135.0   86.9     56.6     24.1    14.2
45ºSurface     1050.     22.0     38.5     79.0     122.1   146.2   135.4   149.7   138.5   100.2   72.1     29.8     6.7
 
Any advice about it? where am I wrong?
 
Thanks a lot