I have a side-wheel-dynamo added with some electronic that supplies me with 12V DC. This dynamo is only for charching my battery.
Why no hub dynamo? My front wheel has priority and is more important. So I want to have a real good hub there (none with a dynamo). So I rather have 2 not connected systems.
For the electronic see here (sorry in german): www.t3productions.de/rad-forum-lader/
Everything is mounted in a little box below the rear rack.