Originally Posted by
andy_p
A lot of the problems with generating consistent power (typically for charging batteries) from a dynohub stem from the fact that it operates over a wide range of rpm. If a generator was mounted to mesh with a front chainring (for example, on the rearward side of the smallest one), the output would be proportional to cadence, and therefore much more consistent. Is there a reason this hasn't been done, apart from mounting and sealing issues?
What are you hoping to accomplish? A few people use dynamos on their bikes to charge their electronics, but it doesn't seem worth the expense unless you're going to ride many days with a lot of time away from a power outlet. I use an Anker external battery to keep my phone charged while I'm on the bike. I'm at a power outlet every night.