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Chriull

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Chriull last won the day on June 4 2017

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About Chriull

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  1. Chriull

    MPGe of EUCs

    I think read somewhere that manufacturers measure the cells by dischargung down to 2.5V . And wheels discharge down to 3.3V. For my calculation i just used the charge measured by dampfakkus.de down to 3.3V against the 3500 announced. Could be that some wrong/faulty table occured to them? They had a bad cell for the test? Or my considerations are just soehow wrong? (*) As every theory has to fit reality - which here definitely is not the case... Ps.: (*) Or everyone is right and its just a simple solution as manufacturers announce as battery capaxity the charge that can be "put inside" the cell, dampfakkus.de measure the charge that can be taken out and the difference are all the different losses inside the cell... So for the consumption discussion here it seems the "nominal" manufacturer numbers or relevant (more or less already including charger losses) and my points were off-topic...
  2. Chriull

    Mten3 max torque limits...

    Imo GWs report the motor current and not the battery current (which is higher by design https://forum.electricunicycle.org/topic/7549-current-demand-versus-battery-voltage/) Additionally the reported current seems to be exaggerated, as reported and discussed quite often here in the forum. The V8 in comparison reports afaik battery current and "real" values... However these numbers are still very usefull, especially in combination with this current alarm - afaik @Marty Backe uses exactly this alarm to keep his wheels alive! Could be that from your second chart the longer 80-100A sections were already quite at the limit for the wiring/Mosfets?
  3. Chriull

    MPGe of EUCs

    1036 Wh is the "nominal" charge calculated from the amount of cells and the cell manufacturers data. Normally they measure the charge of a cell by discharging the cell down to 2.5V (presumably with very low burdens==current). So, for instance a LG MJ1 "advertised" with 3.500mAh (down to 2.5V) delivers discharged with 2A down to 3V ~3000mAh and down to 3.3V ~2600 mAh. Afair most EUCs stop at around 3.3V? So this advertised 1036 Wh could leave a usable charge of ~1036/3500*2600 ~ 770 Wh. (I have no idea of the really used cells in the KS18L nor how accurate these discharge numbers are i took from dampfakkus.de - however it should give a rough idea... BTW: this kind of calculating the Wh numbers is used by all EUC manufacturers, afaik) So best for estimating the Wh/km would be to measure the power consumption while charging the wheel - then one has already the loss of the charger included, too...
  4. Chriull

    First electric unicycle

    Besides the batteries, the technical motor specification is quite exagerated: Motor power: sustained: 500W - would eat up the battery "on the fly"! With that battery configuration this would mean ~8,5A continously drained from the cells... According to dampfakkus.de's testing chart for example the LG MH1 (3.500 mAh cell) delivers just ~1.4000 mAh at 10A down to 3.3V! peak power: 2000W - impossible! That's a region wheels like the KS16B with 680Wh just managed to reach! If it can be anyhow prevented one should never buy a wheel with a battery configuration of just one cell "in parallel" - li ion batteries are not strong enough by now. Such wheels are just toys - for low range slow speed driving. And dangerous as such battery packs tend to get overburdened ...
  5. Chriull

    Spanish discussion group

    Welcome Cace! I moved your topic here and renamed it to "spanish discussion group" - so you can write here in spanish. For the rest of the forum english is the default language - you can post/read there with the help of for instance google translate (the result sounds strange, but works somehow ), as some other do. Google Translate of above text: ¡Bienvenido Cace! Moví tu tema aquí y lo cambié de nombre a "grupo de discusión en español", para que puedas escribir aquí en español. Para el resto del foro, el inglés es el idioma predeterminado: puede publicar / leer allí con la ayuda de, por ejemplo, google translate (el resultado suena extraño, pero funciona de alguna manera;)), como hacen otros.
  6. Chriull

    New Inmotion V10 (V8 Fast)

    The max speed set is just a value which the wheels firmware can allow if the parameters fit: The firmware restricts the max speed by battery voltage. Normally wheels (firmware) calculates the charge % shown from the battery voltage: from 4.2V to some threshold below it shows 100%, then the charge % decrease linearely to 0% at somewhere around 3.3V. Every burden on the wheel (acceleration, ...) decreases (temporarely) the battery voltage by the flowing current additionally to the normal discharge process. So since the wheel decreases the maximum speed with decreasing charge (which is calculated from the battery voltage), the maximum speed can only be reached with absolutely fully charged battery (look at the battery voltage and not the charge %) with as low burden as possible. (... also Inmotion has introduced some novelties with their new(er) wheel(s) - so some specific details could be a bit different ...) Afair classic is the "old" motor driving algorithm and "comfort" the new one. The exact differences were posted somewhere on this forum from inmotion representatives - i don't remember them...
  7. Chriull

    Ninebot Z10 - power supply Charge Doctor mod

    Unfortionately dampfakkus.de only has test charts for 2, 3 and 5A (and some 10A and 20A charts...) 1A should be needed around 25 km/h, with 35 km/h its already about 2A, 40 km/h comes near to 3A, 45 km/h near to 4A per cell... ...if my formulars and coefficients for wind drag and friction are somehow sane. But should be on the "low" side - there are no "internal" losses regarded. Calculations are just based on needed output power. So for 25 km/h this ~1A would lead to just around 12Wh/km ... If i remember right normal real world values would be around 17 Wh/km?
  8. Chriull

    Ninebot Z10 - power supply Charge Doctor mod

    Out of curiosity i just took a look at the graphs from dampfakkus.de for the LG MH1 (3.2 Ah) and LG MJ1 (3.5 Ah). With a discharge current of 2A discharged down to 3.3V both cells deliver around 2580 mAh (2581 vs. 2578 mAh)! (down to 3.0V 3039mAh vs. 3014 mAh). 2 A times 6 cells in parallel times 14 times 3.7V = 621W ... could be some average Power comsumption need while (faster) cruising... The discharge graphs for these two cells show about the same for a discharge current of 3A and 5A. So at least for these two cells a swap would bring nothing but 10% higher numbers for the advertisment ... But i don't know which other cells are around that could really increase the available charge. (and how reliable and reproducible the graphs from dampfakkus.de are)
  9. Chriull

    Sudden break behavior

    The V8 "unfortionately" only has a 2p (2 cells in parellel) configuration - 4p or more can take more braking current (braking power). Generally the stronger wheels should break better - there are youtube videos with braking comparisons/tests. Imho the V8 was not so bad in comparison? The battery charge also should have an impact (although i can't remember tests/reports/discussions). Lower charges (lower battery voltage) should (at least theoretically) allow more braking current (braking force) - anyway as @DanCar mentioned, if the battery is too full the wheel will just stop braking... ;( Is often reported from people driving downhill with a fully charged wheel - but there the wheels warns (beeps) before and tilts back. Don't know if a single strong braking manouver is enough to trigger this overcharge cut-out by the firmware? "Older" wheels (?before the V8 and comparable?) tended too blow the mosfets while stronger braking - can't remember recent reports of "newer" wheels. This should be a problem of the past? Imo generally the braking performance of EUCs is not overwhelming - a comparison with bikes would be great. My feeling would say that bikes easily outperfom EUCs... As it is easy to overlean EUCs while braking this should be trained "safely" to get a feeling of the possibilities - with much safety gear in a safe enviroments! ... and maybe some wheel recovery time inbetween to not overburden the MOSFETs... From the new wheels just the Z10 was reported to have a bad braking behaviour - something like no/insufficient braking downhill at slower speeds? Was/is afair firmware related - maybe resolved by a firmware update inbetween?
  10. Both accounts are functional - just in the beginning every account is restricted and postings need approval. After some posts/time they get automaticly unrestricted. Btw - welcome here in the forum!
  11. I just aporoved it - seems as no moderator saw your post over the weekend for approval
  12. Chriull

    Can´t ride my MSuper 3s+

    @Ipmateos - sorry for the maybe stupid question, but is the battery charged?
  13. +1! ... but the pack will never get balanced - which was ?reported/rumored? at least for the ninebot one e+ to not really happen anyway ..
  14. @FreeRide that was me who moved thus post Here - got the wrong group... I'm not into these twowheelers...
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