From our friend XaviTa:
Saturday night (everyone has a different sense of party) I mounted the electrical kit in my wife's bicycle and I gave a tour... 3am till 3'30am...
Sunday morning I decided to go breakfast's 'Croissants' shopping to Cànoves, 5 km from home... no pedaling at all... came back at around 50km/h!!!
When arriving home something made me a kind of 'Castanyada flight'... scratches on knee, hands... that's what R&D is, isn't it?
I'm really glad to say it's heaven!!!!!!
The only thing is the battery weight... 9.5kg on shoulders... the motor, 48V 500W, needs 15A...
- I don't really know how the front wheel went out of the frame... dangerous!!!
- Fuse wire solder melted, needs to be rewired assuring good contact.
- Battery wire was pretty hot (good for in-jacket heating?).
- Pay attention to front traction wheel in slippery track.
- Internal motor friction is quite high... investigate.
Next:
- Spare 20A fuses or change for DC magnetothermal protection.
- Concentrate wires in a single connector. (maybe iron frame could do negative path, to 'save' one or more wires)
- Mount back solid rack for batteries, too heavy in a backpack.
- Mount regenerative controller.
- Buy confortable seat with suspension as 50km could become long!
- Use full suspension bicycle as motor/battery weight reduces quite a lot comfort.
Ideal: 48V, 1kW motor, 15A 4kg or less batteries, boost converter (from 24V to 48V) with current limitter (battery protection).
Other: Mount traction on a back trailer instead of bicycle.
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