On which side of the roof should a roof window be installed in the attic?

Hello,

we have a converted attic in our old building. It is about 10m long, has no knee wall, only a roof slope with a steep 55-degree angle and standing height on 2m width. The ridge is approximately oriented east-west, so one roof side faces south, the other north. Light comes in through an almost fully glazed gable in the east and a porthole window with about 50cm diameter in the west. The west side is therefore not exactly bright, because two masonry chimneys also run through the room.

At the moment we mainly use the attic for bookshelves under the roof slopes and for drying laundry. To be able to use the west side as an office in the future (when there are more children and the office downstairs would have to be given up), we might consider retrofitting roof windows.
In addition, we want to install a photovoltaic system on the south side. This is planned to be installed in the next few months.

Regardless of the side, the window would have a size of about 0.7m width and 1.5m height to fit between the existing rafters.

Now we are wondering on which side (north or south) a roof window would be better. Here are our thoughts so far:
Advantages south side:
Additional warmth in winter
More light

Disadvantages south side:
Needs good external shading in summer
Takes space from the solar system. Installation only possible before installation of the solar system.

Advantage north side:
Internal shading/privacy probably sufficient, as the sun hardly comes over the gable, thus cheaper
Installation independent of solar system

What are your experiences with something like this? All comments and suggestions welcome.
Best regards
Michael

At the moment, we mainly use the attic space for bookshelves under the sloping ceilings and for drying laundry. In order to be able to use the west side as an office in the future (if there are more children and the office downstairs would have to be given up), we might consider retrofitting skylights. Additionally, we want to install a photovoltaic system on the south side.

Books and drying laundry, how does that go together?

Would the skylight possibly be useful as a maintenance exit on the side of the photovoltaic system?

In the study, as a right-hander, I would prefer light coming from the left side of the desk.

Books and drying laundry, how does that go together?

So far no problem. When there is a machine load of laundry hanging, regular ventilation takes place. The hygrometer never shows more than 60%.

Would the roof window possibly be useful as a maintenance exit on the photovoltaic side?

I will ask the installers about that. The window would be near the upper left corner of an 11m long and about 7m high surface. One half of the surface could be reached quite well, for the other half it probably wouldn't help.

In the study, as a right-hander, I would prefer light coming from the left side of the desk.

That can still be somewhat adjusted by clever furniture arrangement. Work would mostly take place at the computer, where I no longer find these rules quite as important. But it certainly doesn't hurt to keep them in mind.