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  1. A

    Test a battery pack. How can i easily create a high amp load?

    An old electric kettle will do the job. Mine is rated 1500 W on 120 V Since power is proportional to V squared we can readily find the power at any other voltage. For a 48 V battery, for example, the power will be 1500 W * 48^2 / 120^2 = 240 W The current will be 240 W / 48 V = 5 A That's...
  2. A

    bluetooth BMS?

    crossbeak requests If your request was directed at me the version I'm using is Xiaoxiang V2.1.1022 as posted by multifrag on Mar 08 2019 5:43am
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    bluetooth BMS?

    Xiaoxiang V2.1.1022 screenshot: Anyone know what the values mean?
  4. A

    48V Li-Ion shuts itself down at ~45V

    The problem was a dead cell. The procedure I followed to diagnose the problem: 1. Checked group voltages via the bms leads Result: group 5 was low 2. Tested group 5 with liitokala lii-500 using a dummy cell and the bms leads. Result: 7.20 Ah This indicates that only...
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    48V Li-Ion shuts itself down at ~45V

    Thank you amberwolf for citing all the possibilities. I hadn't even considered the charger. Open-it-up day will have to wait for sometime after the 25th when the house gets quiet again. Unnecessary distractions would not be helpful.
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    48V Li-Ion shuts itself down at ~45V

    amberwolf replies: It doesn't help in this case. Vmin is zero, not the value an instant earlier. True of course. Embarrassingly so. I've tried that a couple of times with the wattmeter connected. I expected that the battery voltage should sag a volt or two as the BMS discharged the healthy...
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    48V Li-Ion shuts itself down at ~45V

    My battery is a generic 48V 10.5Ah on an ebike with 5800 km on it. Recently the BMS has started shutting the motor off whenever V drops to about 45 V. I can't tell exactly because my wattmeter resets itself when the supply drops to zero. I can replicate its behaviour using a resistive load...
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    TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

    linklemming asked Sorry I wasn't clear. I meant the original firmware from Tongshen. The numbers I mentioned are based on their sales literature from a couple of years ago. I was impressed at the time because human perception of effort is a roughly logarithmic function and their designers...
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    TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

    linklemming writes The stock firmware uses torque assist levels of 0.4, 0.75, 1.5, and 3.0 Note the progression, each step is double. Try something like that.
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    New "TSDZ2 Torque Sensor Central Motor"

    crun said: I'm with Shaddy and Crun on this. In a word - "just set and forget". We'd have the benefits of two worlds, the elegance and transparency of the stock UI combined with Casainho's improvements to efficiency and smoothness of the motor itself. Everything else on the display is just...
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    TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

    Can anyone explain to me the advantage of spinning the pedals at a high cadence? Numbers have been mentioned as high as 120rpm. There are two reasons I ask. First, any text on bio-mechanics tells us that muscles are strongest when they're stationary and get weaker as he speed of contraction...
  12. A

    New "TSDZ2 Torque Sensor Central Motor"

    To jbalat Thanks for the time and effort in producing these videos. Finally a set of coherent instructions for the rest of us. Angus
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    New "TSDZ2 Torque Sensor Central Motor"

    If a motorboat hits a log a shear pin snaps. It's a deliberate weak link that protects the motor. It's an easy fix. Similarly when your wheel unexpectedly locks up your motor isn't toast. The blue gear is equivalent to a shear pin and is easy and inexpensive to replace. It's a feature, not a...
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    New "TSDZ2 Torque Sensor Central Motor"

    Right on. There are two distinct philosophies floating about, the "throttle based" and what I think of as the "traditional". We traditionalists have a lifetime's experience of pushing harder to go faster. Isn't that just what the torque sensor does? When it detects your push it signals the...
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    New "TSDZ2 Torque Sensor Central Motor"

    No problem with sharing notes. In fact I had 2 papers published in "Human Power" many years ago. http://ihpva.org/hparchive.htm I can't promise any Arduino-specific code, at least at first. I'll start with whatever micro-controllers and compilers I still have on hand. Photos are no problem...
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    New "TSDZ2 Torque Sensor Central Motor"

    Casainho replied to my query about adding a datalogger: Fantastic! This becomes much easier than I imagined. What is the baud rate parity etc of the stream? 3.3V or 5V? What is the word size? 2 bytes? Are there any control characters in the stream for synching? For example I'd expect...
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    New "TSDZ2 Torque Sensor Central Motor"

    Hello everyone. This is my first post to Endless Sphere. I installed a TSDZ2 on my bike last Aug after discovering this forum. As of today it has done 2282 trouble-free km. I had been an avid cyclist for 70 odd years before surgery and chemo therapy knocked the starch out of me last year. The...
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