I am busy planning a new panel installation, We using 4 mm solarflex cables which has all the correct standards for UV, double insulated etc.

There are a few option for getting the wire into the roof, either flatten a piece of conduit which is not flexible and fight with it or use sprague which is also not idea because when you try flatten it, it makes it more of a challenge to push the wires.

Why not just use split conduit, its black, UV stable and easy to push the wires and fits in an adaptor with a bit of rubber tape and considering the solarflex wire doesn't even need to be in a conduit due to the fact that it is double insulated, it offer a little protection when the roof tile is put back in place.