3 W Dynamo Power

Posted by: ConRAD

3 W Dynamo Power - 02/02/15 12:18 PM

.. just wondering where and when the universal 3W standard power size, commonly used for bicycle generators, did it come from. With a few exceptions indeed, e.g. 2.4W Shimano and 6W-12V B&M, most of generators on the market today are rated 3W (nominal power).
Anybody knows why?
Posted by: joerg046

Re: 3 W Dynamo Power - 03/05/15 10:46 AM

Originally Posted By: ConRAD
.. just wondering where and when the universal 3W standard power size, commonly used for bicycle generators, did it come from.


I know why.

There was an old german Law of the for traffic.
in this law, all bicycle components where rated at 15 km/h.

A 3W Bicycle Dynamo had to power the 2,4 w front bulb and the 0,6 W rear bulb (3W) at 15 km/h at full Power.

Today, with LED Equipment, it would be more interesting to know the mAmpere, that are delivered.
Because the Volt are depending on the Speed.
Posted by: ConRAD

Re: 3 W Dynamo Power - 03/06/15 10:46 PM

Originally Posted By: joerg046
... a 3W Bicycle Dynamo had to power the 2,4 w front bulb and the 0,6 W rear bulb (3W) at 15 km/h at full Power ...

Very clear, thank you.