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Chriull

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Chriull last won the day on November 8 2018

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About Chriull

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  • Location
    Wien
  • EUC
    KS16S

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  1. I remember some mod which disables the battery draining connection once the Z10 is turned off - unfortionately could not find it with a quick scan through the forums... ... but it is somewhere described here...
  2. Why? A description of an absolute normal overlean... Best wishes for a good recovery @Oscapuss!
  3. EUCs are no mass products and miss "perfect" QC. Although their quality and reliability improved greatly over the years. Afair @Jason McNeil stated that the most returns come /problems are directly after unpacking. After that there are not really anymore faults to be expected. No manufacturers excluded... So every order is a bit of a lottery - with some small chance one gets a bad product...
  4. Chriull

    MSuper Pro?

    Watch @Marty BackeBacke's overheat hill youtube tests of msp and mcm5. Afair the two wheels which made it best...
  5. You can think about naming the reseller here - just as "warning" for other members. (For fairness with a note to the reseller so he can make here his own statement) Identifying a bad battery pack and replacing it is no miracle. And for just forwarding parcels and writing receipts the markup is not justified. Not all, afaik. Biggest prob is imho that one needs a certain size/turnover so some stock with replacement parts can be financed.
  6. I would personally send it in. Just would try to search easy problem solution before in accordance with the seller like described above looking if only one pack is bad. So the reseller can just send a new pack... But of course only possible if the seller cooperates.
  7. From skiming over some google searching it seems boost converters normally/most/many "block" reverse current(1). They seem to be just vulnerable to too high voltages forced on the output. Depends of course on the respective choosen detail implementation of the circuitry. I'd do some input/output voltage and current measuring (+oscilloscope should be helpfull) with different scenarios - or if one happens to know one experienced with this topic, gather reliable infos. (1) Synchronous boost converters could be vulnerable? I'd see no real reason why an boost converter like yours should be a synchronous one, but i'm not too much into this topic... Yes. The converter will raise the voltage (limited by max setting) high enough that the choosen current flows. As you set the limit below battery max voltage and there is no problem with fully charged batteries your converter seems to block and "withstand" higher voltages at the output. Did you check if the battery does not get discharged - it keeps this higher voltage? Ps.: The motor controller itself is a step down and boost converter. Some links mention to be carefull connecting converters together - depending on their control loop this can lead to (bad) oscillations. ... If ones setup worked some time wo probs chances are high this is not happening...
  8. And "online customer protection"? In austria we have a "fernangabegesetz?" which allows returns within 14 days. The cells charging to high are not the problem - they are the ones which are ok. The cells not charging anymore (dead cells) are the ones causing the problem. One cannot make them working again - only replacement would he possible.
  9. One does not want a new unvalanced pack! It will not last long. Balancing works a little bit, but it seems proper cell matching is the key for a good pack. https://batteryuniversity.com/learn/article/bu_803a_cell_mismatch_balancing From experience of the reports here such not fully charging packs almost ever reveal bad cells. Mostly/often it's only one pack with bad cells - the other parallel pack is in good condition! They balance (mostly) while stage 2: So slight discharge (~10-15%) and repeating stage 2 is afaik the perfect way to force balancing. The seller can choose to repair 12 weeks? For non functioning equipment on arrival there is no chance for the customer to return/conversion? I'd assume one of both packs had dead cells. So if you charge both individually one should reach perfect 84V. If you try this and this is the outcome you know quite sure that you can dump the one pack only charging to ~80%. So one can cut it open and measure, as its not usable anymore. Afair KS18(X)L BMS have at one corner a 21 pin plug hidden under the plastic wrap which offers connection to each cell group! So a small cut us sufficient for measuring. Yes it will. But i'm not sure about just opening and "looking"? Best to proceed in accordance with the seller - or supported by an advocate
  10. You have the specs of your boost converter? Can he take reverse current? Once the motor by regen braking raises the voltage the boost converter tries to prevent this by raising its voltage to max (and stops at his 67.2V or 84V or...). So both motor and the pack charge the internal battery. By this the internal pack gets (over)burdened even a bit more.... For the (short) moments of hard braking... Depending on the overvoltage alarm/tiltback/cutoff, the max boost converter voltage and the internal battery voltage there could be situations which the boost converter cannot withstand - from some people who use such devices this seems to be teorethical/no real problem? If all this limits work together going downhill with a full battery just the overvoltage alarm will come earlier..
  11. Exactly. For example the KS16S has a motor rated 1200W, has a 30A fuse (30A*67.2V~2000W) and the BMS most probably (hopefully) an even higher cut off current. BMS current cut off is meant to be a short circuit protection.
  12. Batteries are normally balanced more or less during the constant voltage phase of charging. So if the charger is a "normal" li ion cell charger and supports the right max output voltage it will balance the pack. Sorry for ?fusspotting?, but li ions should not be trickle charged! I assume that's just an "expression thing" and you ment the constant voltage/saturation stage of li ion charging?!
  13. Seems so - here were many reports that with longer downhill parts only one of the two battery is charged by regenerative breakinf and the packs go out of sync. One has to drive afterwards a bit to get them in sync again. So it seems the controller only uses one pack at a time and switched between the packs. So the battery packs output is not to be connected in parallel ever! For charging both packs are somehow connected in parallel - so they had to disable the output! Regarding your external pack you'd have to make two, so both packs are extended similar (and not get a patallel connection!) A second problem could be/is that a fix connected external pack not only charges the battery pack but also supports while riding and get charged while regenerative braking! Ad riding: As ninebot uses low battery voltages (14s) and are quite powerfull expect "massive" currents to be drawn also from your external battery! Ad regenerative braking: Also in this case quite high currents can flow! Normally above "normal/healthy" charging currents. By this charging currents imo one has to be careful with/can forget boost converters - one would need one that can work bidirectional! Maybe the easiest solution is a portable charging pack with a step down converter with current limiting (if no power outlet is available at your tour to use a normal charger). Z10 were reported here to accept charging currents up to some 7-8A. So while within the constant current stage of charging one can recharge about 7A/18Ah*1h=39% per hour...
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