International Bicycle Travel Forum
International Bicycle Travel Forum
Who's Online
0 registered (), 102 Guests and 704 Spiders online.
Details
Advanced
About this forum
Rules
The Rules for this forum
Terms of use
Agreements for the use
The Team
Who's behind the forum?
Involved Homepages
Bicycle-travel sites already using the forum
Participate!
Use this forum in your Homepage
RSS feeds RSS
Overview of public RSS feeds
Shoutbox
A small chat area
Partner Sites
Statistics
29207 Members
97586 Topics
1532167 Posts

During the last 12 months 2243 members have been active.The most activity so far was at 02.02.24 17:09 with 5102 users online.
more...
Top Posters (30 Days)
Falk 76
iassu 59
Juergen 57
Keine Ahnung 52
veloträumer 51
Topic Options
#1337990 - 05/19/18 08:11 AM AC/DC Converter Efficiency
ConRAD
Member
Topic starter
Offline Offline
Posts: 263
Talkig about AC/DC Dynamo Converters, efficiency should be regarded, imo, as the ratio between the "active power" that is possible to "extract" from a dynamo at a certain speed and the "active power" made available after ac/dc conversion to its output.
Now the point:
since based on my empirical tests from a dynamo it's possible to get 6W at 20km/h and since the output of an e-werk at that speed is less than 3W is it correct to say that the efficiency of the e-werk is less than 50% ?

Below chart courtesy of Fahrradzukunft https://fahrradzukunft.de/


LEGEND
- Max Dauerhafte USB-Leistung = max permanent power at USB output [W]
- Fahrgeschwindigkeit = speed [km/h], all data based on SON28 assembled on a 28” wheel
Top   Email Print
#1338022 - 05/19/18 01:32 PM Re: AC/DC Converter Efficiency [Re: ConRAD]
AndreMQ
Unregistered
I would not agree because it is not clear how much input power the converter needs for this 3W output from the dyna hub. But this would need a discussion of the behaviour of a dyna hub which I guess is done in other threads or forum.
Top   Email Print

www.bikefreaks.de