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  1. M

    Delayed overshoot in torque assist after pause in pedalling (Sempu T2 + Cycle Analyst)

    Follow-up. I made another trying using the latest CAv3-2b3 firmware. Unfortunately it did not improve things. Actually it felt more of a kick-start + overshoot than the CAv3-1.5 version. There was even a strange instance of start-and-stop in motor assistance (first half of Zoom 2 and start of...
  2. M

    Delayed overshoot in torque assist after pause in pedalling (Sempu T2 + Cycle Analyst)

    Hi again, I took some more data from a short trip today -- this time I use my phone with an Android app: "Serial USB Terminal" for convenience, which also nicely provides a time stamp. That way I could plot the figure with the x axis representing the time in seconds. I also attached a screenshot...
  3. M

    Delayed overshoot in torque assist after pause in pedalling (Sempu T2 + Cycle Analyst)

    Wow, I had overseen this. I just noticed the corresponding menu in the CA. I even set it to 0.04. And bingo, gone with the averaging. And gone the delay between throttle output signal and PR current (and bike speed). The figure below shows the unloaded bike response to throttle input: throttle...
  4. M

    Delayed overshoot in torque assist after pause in pedalling (Sempu T2 + Cycle Analyst)

    Hi @amberwolf, thanks for the hints. As far as I understand, some of the tools you cite use the TTL output from the CA, which I also used for data acquisition. I used a pretty tried and tested tool (putty) for the serial USB reading so I wouldn't expext any issue there. To me this points to an...
  5. M

    Delayed overshoot in torque assist after pause in pedalling (Sempu T2 + Cycle Analyst)

    Hi @amberwolf , first of all thank you very much for the prompt and thorough reply. I'll try to be as thorough in mine. I intended it more in a psychological sense, including some of the processing to make sense of the perceived signal. In the RPM case, that would be the counting of the...
  6. M

    Phaserunner / Baserunner Tuning tips and tricks ?

    Sorry for the petty correction, but pi=3.14 radians is only half a revolution
  7. M

    Delayed overshoot in torque assist after pause in pedalling (Sempu T2 + Cycle Analyst)

    Hi, I have been running a GMAC + Phaserunner + Cycle Analyst (all 3 from Grin) + Sempu T2 torque sensor (Aliexpress) for a few years now and while the overall performance is generally good, I have been frustated with the torque assist. The main issue is a delayed response of the motor after a...
  8. M

    Cheap CA Data Logging with Phone or PC

    Thanks @teklektik, 8 years later, this post was still very useful: I confirm this was very simple using putty on Ubuntu Linux. I used the CA utility to check the USB port number, which for me was /dev/ttyUSB0 On the main putty screen, I had to select "Serial", which let me enter the USB port...
  9. M

    how to make a proportional / variable regen ebrake brake lever

    Ok, I'll give it a try then. Many thanks for the advice. PS: looks like a working DIY build !
  10. M

    how to make a proportional / variable regen ebrake brake lever

    Here another idea how to modify an existing, digital e-brake lever into a linear output: https://www.youtube.com/watch?v=ZcjtN6g1BzI (@stancecoke or anyone else: any hint where to purchase linear output lever for electric V-brake most welcome...)
  11. M

    how to make a proportional / variable regen ebrake brake lever

    Thanks much for your prompt replies. Thanks for the recommandation. It's hard to see what the technical specs for that brake lever are (input and output voltages) but I 'll look that up. I also forgot to mention: it's important that the lever actually pulls my V-Brake cable. The main reason...
  12. M

    how to make a proportional / variable regen ebrake brake lever

    Just as a follow-up, I made last year a try with the components suggested by @Nixunen (hall sensor A1324LUA-T and -- I think it was -- radial magnet 9027). Here just as a proof of concept, I taped the sensor on the fixed part of my brake lever (some lower or mid-range shimano brake lever) and...
  13. M

    Bafang G310 geared hub - 11:1 reduction ratio!!!

    Hi ! May I ask why you swapped? I just received a G020.500 kit, and it is pretty small in size and weight... Is it so noisy? (as mentioned by https://endless-sphere.com/forums/viewtopic.php?f=3&t=110859&p=1624919&hilit=g020+500#p1624839) I have yet to get it running, that's why I ask (display...
  14. M

    Solar Panel to charge a 52v 13.5 ah battery pack?

    Looking at the datasheet, https://www.victronenergy.com/upload/documents/Datasheet-SmartSolar-charge-controller-MPPT-75-10,-75-15,-100-15,-100-20,-100-20_48V-EN.pdf the Victron 100 | 20 48V takes up to 1160W for a 48V kind of output (it actually takes 60V batteries, maybe even 72V as far I can...
  15. M

    Solar Panel to charge a 52v 13.5 ah battery pack?

    Hi k2orbust, (edited a previously erroneous post) it seems that you are right. The victron i was talking about (100 / 20 48V) does NOT work as boost controller, and requires a voltage +5V more than battery voltage to function. FYI, a friend who participated in thesuntrip.com used genasun. If...
  16. M

    Solar Panel to charge a 52v 13.5 ah battery pack?

    Ok, so from what I could gather on the internet, the lead-acid charge is rather more complex than the lithium charge profile, and that every phase of the lithium charge profile is contained in the lead-acid curve, so I am becoming more confident that it can simply be adjusted. FYI, see the...
  17. M

    Solar Panel to charge a 52v 13.5 ah battery pack?

    One doubt I have though, is how well suited the Victron is for lithium battery. Here are configuration screens from Victron Connect app (demo 100 / 20): Joseph from em3ev tells me absorption voltage, float voltage and equalisation voltage are lead-acid parameters, so the menu was probably...
  18. M

    Solar Panel to charge a 52v 13.5 ah battery pack?

    What about the Victron 100 / 20 ? https://www.victronenergy.com/solar-charge-controllers/smartsolar-mppt-75-10-75-15-100-15-100-20 https://www.victronenergy.com/upload/documents/Datasheet-SmartSolar-charge-controller-MPPT-75-10,-75-15,-100-15,-100-20_48V-EN.pdf I just ordered ~150 euros (incl...
  19. M

    how to make a proportional / variable regen ebrake brake lever

    Great, thanks, I'll give it a try. I assume you are still happy with your solution (i.e. stable, no drift over time or need to recalibrate often ?)
  20. M

    how to make a proportional / variable regen ebrake brake lever

    That is the most elegant solution I encounter so far! I'd love to reproduce that work but it does not seem straightforward to realize. I'd have a few questions to that end: - could you provide a seller link or specifications for the hall sensor + magnet you used? I suppose they are various...
  21. M

    Removing/locking the freewheel in an internally geared hub?

    I was wondering the same thing, out of curiosity. Did the years bring any new insight here? I see a 5-Speed Sturney Archer is now on sale at Grin: https://www.ebikes.ca/shop/electric-bicycle-parts/motors/direct-drive/igh-305.html @justin_le, would this IGH-motor support regen? Of course we are...
  22. M

    Analysis of regen on an ebike

    Excellent thread, especially start and end, now understanding quite a bit more on regen efficiency, but given the tradeoffs of various systems in term of hill-climbing efficiency, I would appreciate your insights on the overall performance in a mountainous area. The irony is that while it is...
  23. M

    PaulD's lightweight mid drive development

    Do you mean with respect to heating and wearing down of internal pieces? Makes sense. 40% is significant. So there is no safe workaround to internal rewiring. I understand. Perfectly sensible at this stage. Thank you for your prompt reply.
  24. M

    PaulD's lightweight mid drive development

    Hi Paul, and everyone, Could such an adjustment help to use the motor with a higher battery tension? As I mentioned to you privately, I need a very large battery capacity for serious bike travel (in the sense of long distance, mountains), and sadly it seems that there is not much offer in 36V...
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