Preparation of photovoltaic system - placement of passage tiles with empty conduit

Hello everyone,

in the coming days, our roof will be covered. For budget reasons, we plan to retrofit a photovoltaic system in about 5 years. However, we are already making preparations now to minimize later interventions as much as possible (e.g., into the roof insulation layer).

A passage tile for the photovoltaic system as well as an empty conduit to the building services room will be installed. In the attic, the cables from the roof can be pushed through the empty conduit to the building services room.

Roof orientation: South/North
horizontal base area of one roof side: 9 m x 4.5 m
roof overhang: 40 cm
pitch: 42°
roof windows: 4 pieces

Placement of the passage tiles on the south roof directly under the ridge. Cables can be routed under the roof tiles to the north roof, if this should also be used for a photovoltaic system at some point, which I currently exclude. An empty conduit of DN40 was planned.

Sketches see pictures

I would appreciate tips on the planned approach.

Best regards
enno

Photovoltaics are best installed directly. Retrofitting is always more expensive (scaffolding, etc.). Financing through KFW is very affordable.