Drinking too much
beer in Munich ;)
Join Date: Feb 2012
Location: I would rather not say
It depends what current you expect to distribute from the socket. If 15Amp then you will not have sufficient capacity in another accessory's wiring.
There may be a spare fuse in the fusebox yoiu could connect up
I'm curious why yoiu don't want to connect tot he battery directly ? With an inline fuse at the bettery +ve the installation would be completely safe. You would have the ability to attach a solar trickle charge iof yoiu did that too.
If you would like the new circuit to be switched you can add a simple accessory relay, connected so the coil is driven from a switched supply (you could use the radio switched +ve) and then the socket will only be active when the ignition is on (Meaning that any accessory left plugged in accidentally would not drain the battery)