Regen for the dummies ?

[gderou]

Hi All,

I have modified my electric scooter (Speedway 2 from Minimotors) to enable regen. I found the method on another forum - and soldered a wire between the X and DS pins (see https://www.espritroue.fr/ckfinder/userfiles/files/image(807).png).
That works well though I find it a bit too strong.

I would like to understand what happens with that modification:
- Can this damage the battery ? (too much current flowing into it for instance ? though I don't know how to evaluate that current and what would be «too much»)
- Can the brake power be adjusted and how ? (instead of a wire, would resistor adjust the braking power ?) I have no idea of the inner workings of my controller nor any datasheet I could rely on… Ideally I would have preferred an adjustable e-brake tied to one of my brake levers…

The purpose of this mod was purely braking, and regen is just a bonus (hoping it doesn't destroy my battery slowly, in which case it would be a malus…)

Thanks for your help
Guillaume

[moderator edit to fix link]

 

[avandalen]

>>>Can this damage the battery?
Maybe the BMS can be overloaded, since the charge Mosfets are just dimensioned for charging with low current.

 

[gderou]

That is a good question - I don't know the value of the BMS limit (I don't have detailed battery specs) nor an idea of the regen current (is there any way to estimate that ?).
So far so good (4 days commute - about 30 km).

I don't ride too fast though (max 35 km/h) and have recently bought a device that limit the charge so my battery is never overcharged.

 

[gderou]

Very detailed and interesting post about regen: Analysis of regen on an ebike