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    Help troubleshooting scooter won't turn on

    I thought I’d post a follow up and resolution to my problem. My charger came, but unfortunately did not solve the problem. I decided, as a last ditch effort, to open the battery pack to investigate. After removing lots of silicone and sliding the cells out, I discovered one of the balance leads...
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    Help troubleshooting scooter won't turn on

    Thanks for the help. I had ordered a charger before I started digging into it (I could not find any 42v output chargers laying around the house) so I'll see what happens when it arrives. Fingers crossed it comes to life, but I'm not holding my breath. Unfortunately, these scooters seem to be...
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    Help troubleshooting scooter won't turn on

    Battery negative to controller B+ input = 36v I had to unplug the connector for the display to be able to measure, but all wires measured 0v, except the red which measured 36v. I think the nail in the coffin was your last suggestion. Pressing the power button while monitoring the battery...
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    Help troubleshooting scooter won't turn on

    Hi all. I recently picked up a used Ridel XS1 scooter. The previous owner told me he lost the charger and it had not been rode in about 2 years, but for $20, I figured I could take a chance and buy a new charger and not be out a whole lot. Well, I got it home and decided to do some...
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    Sourcing parts for my first eMoto build

    There is a youtube video where they discuss these batteries. At one point, you can see the label where is states they are Lishen 21700 LA cells in a 21s configuration. E&C has also developed their own controllers for the Razor kits. It seems like they are phasing out of the Votol, but maybe...
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    Mounting the QS138 v3 in taotao dbx1 140cc

    That should be a fun bike! I have a similar build using the v3 motor, but at 96v and a full size motorcross frame and knobby tires. It's nice and torquey! I imagine with those smaller wheels, you'll have no problem getting up to speed as fast as you want! That battery looks like a beast...
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    YZ250 build

    I figured out the clunking. It wasn't the motor after all. I'm a little embarrassed to admit that the chain had too much slack in it and I think in a high torque situation, it was enough to jump teeth on the sprocket. I also noticed that my motor mounting tab has broke off the motor. I don't...
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    YZ250 build

    The LM setting didn't seem to do much, or anything. The only other piece of info here is that I had to swap a few of the hall sensor and phase wires to get the wheel spinning in the right direction. Maybe I need to do the auto tune again after that?
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    YZ250 build

    I just tried reducing the max line current setting to 200A thinking that if the controller and BMS settings were close, maybe the controller was asking the BMS for more and the BMS was going into "protect" briefly, but that didn't seem to make any difference. There is a section in the...
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    YZ250 build

    I've been able to make some decent progress lately and actually took the bike on the first short ride today. Still a lot of clean up to do with wiring, etc. but it was nice to have the bike moving under it's own power. I did run into a small (I hope) issue, though, on the test ride. As I got...
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    YZ250 build

    I'm looking for the capacitance of my controller and that matters because it will determine how long the precharge takes. I do not use the 4 little pins on the connector. The resistor on the connector is built into the positive side of the male connector.
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    YZ250 build

    I reached out to QS directly and found the QS12 that I am using has a 15 ohm resistor. I was able to verify on my connector as I measured roughly 17 ohms. I've also sent a note to far driver to see if they can tell me the capacitance, but not heard back yet.
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    YZ250 build

    Thanks for all the detailed info. I am using a 1 kohm resistor, so 15 seconds of precharge time, using your example. That is longer than I was thinking. Part of my problem is that I cannot find any info on capacitance of the controller, so I am guessing. I think I will change to a 100 ohm...
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    YZ250 build

    My understanding of precharge, as used on these types of builds, is for the capacitors in the controller. Nothing to do with protecting the contactor. That's why I was surprised to hear him recommend precharging the other side of the contactor B+ wiring. I suppose it's also possible I...
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    YZ250 build

    Thanks for the info regarding phase wires. Confirms what my recollection was. On the contactor, I actually have one with very similar specs with a precharge connected to a switch. Somehow, I managed to weld the contacts, or was sent a defective unit, as it will not interrupt the flow even...
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    Nanjing far driver controllers

    I'm not 100% sure what that is...does this screenshot help?
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    Nanjing far driver controllers

    I have a 96850 that I just got wired up last night. It is driving a QS138 v3. I've read this whole thread (skimmed it) but have two questions I'd like to confirm: 1. Temp Sensor - I had to change to "none" to get it to run. Is this still the only option? Would be nice to be able to utilize...
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    YZ250 build

    This build has been on hold for a few months waiting for my battery to be built. It was finally delivered this past week and I am happy to report that the motor is spinning...in the wrong direction. I know I have read on here how to change the direction of the motor, but for some reason, I...
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    new 12kw dirtbike

    Lol...I noticed that too and did chuckle a little.
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    new 12kw dirtbike

    Do it! I kind of wish I would have found this before starting my conversion. For me, the conversion process is half the fun, but this route would have probably been cheaper and for sure less time. Quality is always the wildcard.
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    Honda CMX300 conversion QS138V3 or ME1803

    Clean looking build! :bigthumb:
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    YZ250 build

    Thank you! Lots of good information there. I will have to register for that site so I can view the larger pictures. Has anyone used QS10 or QS12 connectors for their battery? I was planning on Anderson plugs, but these were recommended to me. The QS12 looks like it has a max amp rating of...
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    Jerry Can Mini Electric Motorcycle

    Nice build! Did you build the battery?
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    YZ250 build

    Oh, I see. Yes, I do not want to have to weld. Plan is to utilize existing frame mounting holes/locations which I have been able to do so far.
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    YZ250 build

    The build has not really moved much in the last couple of months. I had some travel for work as well as 2 weeks with family on vacation. I really need the battery to make some progress, but that is a pretty hefty bill, so I have been putting it off. I am hoping to be able to pull the trigger...
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