This is outdoor:
I'm not supposed to open that, except for emergency access. Anyway, there's nothing inside but three NH-Fuses.
Basically it looks inside similar to this:
This is indoor:
Two meters (one for the solar panels, the other one for import / export metering), a bunch of breakers and some other stuff. There's two more boxes like this (without the meters, just breakers) in the house, for local distribution purpose.
Note the three phase breaker bottom left, this is a special delayed one. All the breakers and the outside fuse box build a cascade of breakers/fuses that one the weakest will break in case of a fault. One can turn off all power to that panel using the bottom left breaker, handy if the meters need to be replaced or one wants to do some work at the breakers.
This is a rather modern one, one can find really ugly looking ones, especially with no breaker/fuse to de-energize the panel. One doesn't have to upgrade the panel to the latest standards as long as there aren't significant rebuilds done - so the old ones tend to exist for long time.
(excuse the rotated image, but I can't be bothered fighting EXIF)