On Thursday, March 16, 2017 at 3:08:00 PM UTC-7, Jeff Liebermann wrote:
On Thu, 16 Mar 2017 10:20:43 -0700, Joerg
wrote:

There is no need for 27.5W but there is for 8-10W. That should be
reasonably possible, else the dynamo would have smoked out during their
testing.

If all you're powering are head and tail lights, 10 watts should be
sufficient. However, if you're powering other devices (GPS,
smartphone, rear view camera, electric shifter, fog horn, etc), then
more power is better.

How about if you just wanna go uphill at 20mph?
How many watts are required?
https://www.google.com/search?q=fat+...zJ244tlGbRmAM: