We used the double socket for connecting a Navis and a freezer. I made the mistake not to pay attention to how much power draw units and how much power can withstand the double socket. 5 A are indeed "normal" for such an outlet, but are not sufficient for our needs. After 10 minutes, the fuse and the double outlet was extremely hot. So not everything in the freezer was bad, we had to just go without navigation. Now I buy a device, which can 8A. That should be enough.
