It's a regular German outlet, but they would be more comparable to a drier outlet here in the US, although without being rated for such high loads as an american clothes drier.

As another commenter said, They're used to cover the base load of lights, fridge, small electronics. Most all of these systems won't have any battery storage so the power either gets used in the moment by the home, or exported to the utility. That part isnt really any different from a typical solar installation in the US. They're just smaller systems so it's more accessible to lower income people and people that live in apartments.