Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[CliC]

Hmm, makes sense that regen would be disabled when the battery was fully charged.

But two things jump out at me: first, why choppy regen as opposed to just none or minimal, and second, why is this the first time I've seen it? The only difference about yesterday's ride was that the bike had been plugged in for the week it rained here.

Does it take over 9-10 hours to truly fully charge? My ride to work is maybe 10 miles round trip, and I often plug in while there.

[Lipo423]

Hi Clic,
The BMS + the motor controller are the ones taking control here. As soon as the BMS senses the battery fully charged it "tells" to the controller that does not want any more "Amps" but at the same time it also tells to the controller that wants some "Amps" when the battery voltage has drop a little...which creates this "choppy" effect. Offthegrid described it in a ver good way with the jug filling.

Battery balancing -or charging up 100% of available capacity- could take more than 9 hours, besides that,  the available capacity could change because of further factors -being one balancing- but also outside temperature variation.
Lithium chemistries love/perform better in warm weather however they live longer when kept cold

[rotoiti]

Got a recall notice for this today.

[ColoPaul]

Got a recall notice for this today.

Me too.   Also for the brake switch.   And I hope, before the summers out, that there's one more for the 'glitch'.

[trikester]

I also explained this fully charged regen situation in my recent post titled; "A word to the wise about regen braking". It appears part way down on this 1st forum page.

Trikester

[CliC]

Hi Clic,
The BMS + the motor controller are the ones taking control here. As soon as the BMS senses the battery fully charged it "tells" to the controller that does not want any more "Amps" but at the same time it also tells to the controller that wants some "Amps" when the battery voltage has drop a little...which creates this "choppy" effect. Offthegrid described it in a ver good way with the jug filling.

Yeah, but I would think it would have a bit more hysteresis, rather than the chattering effect I experienced.

Battery balancing -or charging up 100% of available capacity- could take more than 9 hours, besides that,  the available capacity could change because of further factors -being one balancing- but also outside temperature variation.
[/quote]

Obviously this is true. I didn't know it could take 2 or 3 days though.

[Lipo423]

Yeah, but I would think it would have a bit more hysteresis, rather than the chattering effect I experienced.

That should be the way with a more sophisticated BMS/controller...In our case the computer system it avoids overcharge because of the high risk of destroying the cells (it is so easy to do so, believe me...and there is no way to bring them "back to life" properly, as it happens to other battery chemistries)

Yes, it can take that long, but practically what you get in additional watts after 15h or so is very low.