Niiiice, thanks ... the angle of the roof will actually be close to the same, as I want to raise the walls as well, but that shouldn't really make much difference since the top will be at the same height.
My town wasn't on the list, but I picked one half an hour (30 km) north from here.
Malmoe
Optimum Tilt of Solar Panels by Month


Figures shown in degrees from vertical
Jan Feb Mar Apr May Jun
18°
26°
34°
42°
50°
58°
Jul Aug Sep Oct Nov Dec
50°
42°
34°
26°
18°
10°

So I'm guessing these numbers of the tilt of the solar panel corresponds to the angle of the sun (ie the same angle)?
Also, the angle is when the sun is at its highest, right?
So now I "just" have to learn how to make/move the sun in sketchup (and measure angles in there)