Electric Bikes - Begining of an e-Brompton DIY project

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danoulz
09-21-09, 03:54 AM
I don't want to cross-post, so here's the link to the Pedelec forum thread:

http://www.pedelecs.co.uk/forum/electric-bicycles/4682-diy-stage-1-received-bafang-tongxin-kits-photos.html#post59183

Cheers, Daniel

danoulz
10-01-09, 02:44 AM
I've just received the battery from China. Again, I do not want to cross-post so here is the link to the Pedelec forum:

http://www.pedelecs.co.uk/forum/electric-bicycles/4734-diy-stage-2-received-li-ping-lifepo4-battery-photos.html#post59988

Cheers, Daniel
danoulz
10-09-09, 03:25 PM
My e-Brompton is complete ! :)

See here for the build log, with plenty of close-up photos:

http://www.pedelecs.co.uk/forum/electric-bicycles/4786-diy-stage-7-first-ride.html#post60641

Cheers, Dan

danoulz
10-13-09, 06:18 AM
I think I nailed it now :) The layout is fantastic, it works really well for me ! See here:

http://www.pedelecs.co.uk/forum/electric-bicycles/4825-diy-stage-8-continuous-improvements.html#post60991

I love this e-Brompton ! :thumb:
danoulz
10-18-09, 07:22 AM
Here's some interesting GPS tracking data:

http://www.pedelecs.co.uk/forum/electric-bicycles/4825-diy-stage-8-continuous-improvements-2.html#post61464

The electric motor assistance shuts-down somewhere between 20-25 km/h, and furthermore I only use it for going uphill (the Brompton was really heavy thanks to a decent shopping load)

I'd estimate that on the steepest hills I only contribute 60% of human effort. The rest of the time I am probably providing between 70% and 80% of the effort required (anything below the 20-25 km/h speed
curve).

At any rate, I have now learnt how to properly use the pedelec mode (choice of gearing, etc. due to speed-only sensor, no torque sensing), and I am beginning to enjoy it ! :)

Cheers, Dan