Does anyone know if you can charge a Garmin Oregon GPS from a bicycle hub dynamo with the optional rechargeable batteries? Thanks Karl.

  • 1
    It's unlikely to work without some custom electronics, unless the manual say so. Bike dynamos actually put out AC, and a charging input probably expects DC; the voltage will also vary. If you're on the desktop version of the site, have a look at the "Related" sidebar
    – Chris H
    Feb 22, 2017 at 10:32
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    Something like peterwhitecycles.com/b&musbwerk.php may be an option
    – Batman
    Feb 22, 2017 at 23:13
  • @Batman that could convince me to get a dynamo hub. Nice find
    – Chris H
    Feb 23, 2017 at 8:26
  • @ChrisH - there have been a few others , for a while. The only thing is that you have to charge before the ride -- the amount of power your dyno gives is not going to be enough to charge it up most likely, so it'll just act as a battery extender.
    – Batman
    Feb 23, 2017 at 14:44
  • @Batman I'm familiar with B&M, giving me some confidence in them. Just not running down (e.g. my phone with a 0.5A source and the screen on) would be good. It becomes a question of whether I want to learn to build wheels, and whether I want to spend the money (or even more money and have it built), as I haven't seen an off-the-shelf dynohub wheel I want.
    – Chris H
    Feb 23, 2017 at 15:01

1 Answer 1


Yes - I have done this using a SP PD-8 and a Sinewave Reactor . However, it's easier if you use the Reactor to charge a cache battery, and then charge the Garmin from that. This is because the Garmin will try to switch off whenever you stop if it's running directly off the USB out of the Reactor.

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