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  1. S

    How unsafe are custom batteries?

    @Comrade that is a great school of thought. The closest thing I think I could find would be a Sur Ron battery. @E-HP Yes thats them. Good to see they are still around. Although I don't believe they are making custom packs anymore. The BBQ grill is a good idea. Or outside. @Inanek Ammo case...
  2. S

    How unsafe are custom batteries?

    Hey guys this may not have a straightforward answer but it is on my mind a lot and its making me uncomfortable. I have a custom go kart I put together a few years ago. I had EV3MV (not around anymore) put together some nice 20s5p 18650batteries with BMSs. We charge this thing with cheap Chinese...
  3. S

    Can you run this BLDC motor backwards?

    @A-DamW Yes and I think a low platform trike I'd roll in the back of would be a pretty simple easy way to go. And I'd just forgo all the stepper motor steering in favor of a handle bar. It would be a little top heavy and also the better thing about rolling in from the front for me is I can mount...
  4. S

    Can you run this BLDC motor backwards?

    @stancecoke Definitely taking this into consideration.
  5. S

    Can you run this BLDC motor backwards?

    @stancecoke Kind of a long answer with multiple pieces but one piece of it is that I don't have very much function compared to a paraplegic. I lack hand and full arm function so attaching a bike like this is not something I could imagine doing myself at this point. I am a c5/6 quadriplegic. I...
  6. S

    Can you run this BLDC motor backwards?

    Sounds like there are a few options. That's great there is a community modifying them. What are most guys doing exactly? That is great to know the controller can send variable regen signals to the motor. Question - with 4 motors and strong regen, do you think I will be ok not having mechanical...
  7. S

    Can you run this BLDC motor backwards?

    Ah I knew I'd find great help here! Good old Endless Sphere... @Inanek, Found a teardown video. The motor looks to be direct drive. Is anyone able to tell if these are neutrally timed from this crappy screenshot? Video link: Next question... If I wanted to find a controller for this that I...
  8. S

    Can you run this BLDC motor backwards?

    I am interested in using the hub motors from the Segway Ninebot G30 scooter to make this cart pictured below. Motor link...
  9. S

    Battery Build Questions - 2170 cells - 20s10p

    Ok thank you. That answers my question about cell orientation. Where do you buy the metal strips that you use to make these connections? As for the BMS. Does it still manage the charging of the cells? And then it will shut the whole battery down if it senses one of the packs is lower then...
  10. S

    Battery Build Questions - 2170 cells - 20s10p

    Hey all. Looking to build a badass battery to replace my current setup. I have the orientation of cells figured out but have questions about how to wire the pack. I'm not sure whether I'll hire somebody to build the pack or do it myself. If I can get enough information here I may just do it...
  11. S

    Looking for somebody to rebuild my perm 132 motor

    Well I melted the magnets off of my perm 132 motor so I ended up buying a lynch motor but the motor has a lot less torque and too much top speed so I am looking into rebuilding the perm if I can find somebody that can do it well. I think were going to have to buy new magnets because a lot of the...
  12. S

    Why have my magnets come unglued? Perm 132 motor

    We are running the motor at 72 V and max 200A. According to most sources that is within the range of this motor however I have seen one German seller saying that it only goes to 60 V. I am uploading a few pictures. My current plan is to try to remove the remaining two magnets then reglue all...
  13. S

    Why have my magnets come unglued? Perm 132 motor

    Hello all, I have a perm 132 motor in a custom ATV build. We recently disassembled everything to paint the frame and we put everything back together and we went to turn the motor and it sounded like there were rocks in it! There were also some strange things happening with the electronics before...
  14. S

    Looking for temp sensor for perm 132 motor

    Does anyone have experience installing a temperature sensor on a perm 132 motor? I want to tow my friend up the local mountain here and I don't want to kill my rig. Anyone know what temperature would be considered too hot? I have a cycle analyst V2.3 and was dissapointed to learn the V3 has...
  15. S

    Ebike Battery Cell Layout Questions

    Thank you guys. I meant 20s5p. Decided to just keep using the batteries I have for now but I will make some in the future.
  16. S

    Legal classification of my custom build - Quadricycle? ATV? Wheelchair? All?

    Just logged in after a long while. Thank you all for the thoughtful responses especially wturber. I've ridden it around a bit in Pacifica, CA and haven't had any issues yet. I've gone right by a cop on the road and he didn't even look twice. I think it is an electric ATV but I am most certainly...
  17. S

    Quality of Kelly Controllers

    Hi all. I have an electric ATV off road wheelchair thing I'm building and I am using a Perm 132 motor and an alltrax SR72300 controller. I was advised by the guy at the local EV supply shop to stay away from the Kelly controller I had purchased and his reasoning was that they tend to fail under...
  18. S

    Legal classification of my custom build - Quadricycle? ATV? Wheelchair? All?

    Hey all. I have built a custom vehicle that doesn't really fit into one legal category. I'm looking for help finding the laws regarding this. It is a pure electric full suspension vehicle with a perm 132. It is very fast but we've installed a speed dial so we can dial the power back. I think...
  19. S

    Ebike Battery Cell Layout Questions

    Hello ebike battery builders. I am going to try making my own battery packs for fun and to save money this time around for my electric atv project. I bought some batteries from Em3ev a few years ago and I want to use the same form factor as those. The packs are 5s20p. So 72V. At first I tried...
  20. S

    Should I use Cycle Analyst on my build? - Wiring

    Thanks guys I agree- It would be great to hookup the throttle but the throttle is resistive 0-5k ohm. The CA wants a 0-5 volt throttle. We have a lot of time into integrating this into the hand controls. Unless someone can think of a way to inverse the voltage output on the throttle...
  21. S

    Should I use Cycle Analyst on my build? - Wiring

    Hello All. I am building a wheelchair/atv/off-road go cart. Motor is a perm 132 permanent magnet motor. Controller is an Alltrax SR72300. For reverse I have external reversing contactors and the throttle is a 0-5k resistive throttle. This will be running at 72V and 200 amps peak. Currently I...
  22. S

    72 to 52V DC DC converter - Do they exist?

    After thinking about it more I think the 72V controller is the way to go. Thanks
  23. S

    72 to 52V DC DC converter - Do they exist?

    Hey All, So I built an electric quad using the motor and controller from a 2010 Zero motorcycle. The motor is a perm 132 and the controller is an alltrax that can take 52V. Thing is I spent $1200 on 72V batteries already because I thought I would be using a different controller. My question: Can...
  24. S

    Large drone motor for go kart

    Back to the original question - Does anyone know what controller could be used with this motor?
  25. S

    Large drone motor for go kart

    All in good fun... John, that is interesting about the efficiency number crunching. I wonder how they are even measuring torque with a propeller on it... isn't torque and power usually calculated by accelerating a mass?
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