To go along with what Zimmerfrane is saying, if you look at a discharge graph for a 3500mah 18650 lithium battery you will see that voltage decreases at pretty much a linear rate until around the last 20% of capacity where it starts dropping off sharply. Your perception of less power is therefore correct but is not due to software. It is a result of the battery not being able to supply a set voltage throughout the discharge.Likewise, if you're claiming that assistance drops off at 30% battery, you need some evidence of this at 35%, 30%, 25%, 20%, 15%, 10%, 5% otherwise it's just hearsay
I agree to base on evidence (see my measurements about walk mode), but if I'm pushing at about 250W (I'm 65 ) at 40% support and SUDDENLY "feel" a dramatic drop in support and then look at the battery remaining and see 15% (before this discussion, so not influenced), what should I think?To go along with what Zimmerfrane is saying, if you look at a discharge graph for a 3500mah 18650 lithium battery you will see that voltage decreases at pretty much a linear rate until around the last 20% of capacity where it starts dropping off sharply. Your perception of less power is therefore correct but is not due to software. It is a result of the battery not being able to supply a set voltage throughout the discharge.
This post suggested there is a linear drop from 15%.I think from 15-1% you get more or less linear drop of motor support, at 1% motor suport is turned off completely and remaining battery is used only to keep TCU alive.
New experience.Well perhaps everybody's bike is different, but I have never had to wait longer than five seconds for walk mode to kick in at full speed after lifting the rear wheel while pressing the button. Never absolutely never had to wait 18 seconds or even nine seconds.
You are correct in that power is reduced at 15% remaining capacity by the software reducing current to the motor. IMHO This is to both protect the battery as well as extend the remaining range as much as possible. The lower the current draw the higher the voltage,. The higher the voltage the more power at a given current...it is a balancing act to get the most out of the battery without causing appreciable damage.I agree to base on evidence (see my measurements about walk mode), but if I'm pushing at about 250W (I'm 65 ) at 40% support and SUDDENLY "feel" a dramatic drop in support and then look at the battery remaining and see 15% (before this discussion, so not influenced), what should I think?
According to the manual "At 15% battery charge remaining, the system will start to reduce the amount of support", I think that the system really reduces the support.
RCDallas, the graphic you show is the discharge curve of the single cell, but the battery pack is managed by a BMS, that prevents the voltage drops at the "knee" level. The minimum battery pack voltage level is definitely above the red line, and the curve is in linear zone.
The support drop is not the result of the cell voltage and intensity current drop, but the effect of the software choices.
This post suggested there is a linear drop from 15%.
Maybe, since it became increasingly hard to push on the pedals, but this one, yes, could be only a feeling due to my increasing tiredness
At 5% you get another sudden drop, less noticeable than that one at 15%, since the support is already low.
I went below 15% and 5% only another time , and didn't "feel" any drop, but I was not pushing so hard and requesting such a support.
We don't know if the support reduction is in % or absolute.
My previous Yamaha PW-X cut the support (at 10% remaining) in absolute: you wouldn't notice if you were in ECO+ or ECO, but clearly noticed if you were in STD (roughly respectively comparable to 10, 20, 40% of Brose support)
I guess the software cuts the maximum current intensity (thus the power, since the voltage drops only about 10% from fully charged to the minimum allowed by BMS) to preserve the battery, but if the motor draws less than that maximum, the support will not be reduced.
On the other hand, why sould the software cut the support in % if the motor is providing, let's say, 100W?
If you go on flat you'll never notice a drop
Motor failure last night. Sounds like belt slipping.
This is on the new firmware too.
How many miles had you done/how old?New motor fitted in 30 mins after drop off time, by Berkshire Cycles! Excellent service! Clutch failure they are saying. New motor seems much quieter .
New motor fitted in 30 mins after drop off time, by Berkshire Cycles! Excellent service! Clutch failure they are saying. New motor seems much quieter .
How many miles had you done/how old?
Hi James, Whats the build date of your replacement motor?
Thanks James ?E01680-100200703-2-5038
which suggests july 2020 if the decipher method mentioned earlier in the thread is correct. Berkshire had these delivered the same day so they are nice and fresh.
I wouldnt despair if you get an older date on a replacement motor, berkshire said in one of their emtb videos that specialized may well be recycling casings.
E01680-100200703-2-5038
which suggests july 2020 if the decipher method mentioned earlier in the thread is correct. Berkshire had these delivered the same day so they are nice and fresh.
I wouldnt despair if you get an older date on a replacement motor, berkshire said in one of their emtb videos that specialized may well be recycling casings.
my motor has 171023. I guess there are only 12 months, so its year-month-dayLooks like it’s a 2020 motor, either 3rd July or 7th March 2020. I’m not sure which way around it works with the serial number.
Really poor service from your lbs, shouldn't really be selling them if they can't fix them
my motor has 171023. I guess there are only 12 months, so its year-month-day
Would be nice to hear that the motor date isn’t the deciding factor in old/new parts from @Specialized Rider Care directly and not an LBS.July 2020 motor then... perfect ?
Would be nice to hear that the motor date isn’t the deciding factor in old/new parts from @Specialized Rider Care directly and not an LBS.
I have a 2021 Levo Comp with a Dec 2019 motor build. No issues so far but would like confirmation. Haven’t seen them on this thread in a while.
Where did specialized reference this? I don’t recall reading that. Seems a simple update or reply from Rider Care would clear this up.There is no fixed date after which you have an "improved" motor, that's what specialized said...otherwise there would be a replacement campaign. But if I had a 2019 motor on a 2021 model, with no extension of warranty, I would be a little concerned...
read here:Where did specialized reference this? I don’t recall reading that. Seems a simple update or reply from Rider Care would clear this up.
Finally new motor on the way. God knows how long it’ll take to ship - hearing so many shipping horror stories. No idea on build date till it arrives.
Hi All, I love my 2020 Levo comp but as part of this thread I have some concerns.
The motor makes a nasty grinding / scratching noise when in Turbo and usually when I first get on the bike.
If you look closely at the video it stops once I change to trail mode.
Its starting to happen more frequently and occasionally in trail mode.
I have asked a couple of Specialised dealers and they say just bring it in for the firmware upgrade and it will sort it out.
Im concerned it might be a sign of future problems and the motor may require replacing.
Has anyone had a similar experience or know what it might be, or what to suggest at the Specialised LBS.
PS yes unfortunately the right hand side of the frame has a few nasty scratches.
Hi thanks for the support and idea about the mud andI will ask the LBS to take a look , but think it would still make the noise in other modes.Ive not had a similar sound but that sounds way louder than my motor in any mode (mine has a build date sticker of April 2019 if that means anything) and the older firmware.
I honestly dont think the firmware update will fix that, sorry to say.
Might be something simple like mud in the motor plastic casing, worth having a look just in case.
read here:
Levo Gen 2 - Warranty extension & Firmware Update for all 2019/20 Levo/Kenevo with 2.1 motors
To all owners of 2019/20 Turbo Levo & 2020 Kenevo featuring the Specialized 2.1 motor, here's a letter to you from Mike Sinyard - our founder and CEO. Thanks for all of your support & feedback on this forum. We'll keep a close eye on this thread and do our best to answer any questions.www.emtbforums.com
Hi thanks for the support and idea about the mud andI will ask the LBS to take a look , but think it would still make the noise in other modes.
will let you know what I find out.
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