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  1. 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...
  2. 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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
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    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...
  10. 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...
  11. 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...
  12. S

    Large drone motor for go kart

    This is theoretical for now and cost prohibitive but... If I were to want to use this motor: http://store-en.tmotor.com/goods.php?id=891 on a go kart... what controller would I use first of all. Would I need the esc? I'm unfamiliar with the drone world. Any other problems I wold run into? Seems...
  13. S

    Need Electronics Help For ATV Build - Motorcycle Driveline

    Hello All. I've been working away on a vehicle I designed for myself. Its an off road quad with a powertrain out of an old Zero motorcycle. I am a quariplegic so it has hand controls. See pics below. Here is a link to my google doc with the electronics info on it...
  14. S

    Anyone seen an electric rock crawler?

    What if somebody were to make a badass version of these And put them on under a buggy like this Wouldn't that be cool?? Wouldn't it??
  15. S

    Buying MXUS From AliExpress

    I am thinking about buying this: https://www.aliexpress.com/item/MXUS-V3-3000W-brushless-no-gear-hub-motor-for-rear-electric-bike-electric-bicycle/32649215681.html?spm=2114.40010208.4.124.1RtMLs Does anyone have experience buying from this seller? Seems legit but thought I'd check. Wouldn't...
  16. S

    Reverse and Freewheel? Quad Project

    I am designing an offroad quad and I want to use motors inline and connected via shaft to each rear wheel. I really want reverse as this vehicle is for disabled people who cannot get out and push so I don't think I can use a freewheel. However I think having direct drive is going to be annoying...
  17. S

    What if... smartphone ebike computer

    All I've ever seen for ebike computers are these 90s looking lcd display type computers. Does anyone make a full touch screen, full color computer? Maybe it could run on an old cellphone? Or better yet, it could run on your own cellphone and charge it! Whats out there?
  18. S

    Full Suspension Rock Bouncer Inspired Quad Build

    This is going to be my build thread for my electric quad cruiser I'm building. I've been throwing lots of designs around with different suspension and motor ideas. I've pretty much settled on the design I have now which should have good suspension travel and articulation while being relatively...
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    Prototyping/Simulating Omni Wheel Vehicle Control

    Fair warning this is probably not the place to ask this but I have not idea where to ask so I'm looking for clues. I designed some wheels that spin 360 degrees that are based on NASAs mrv wheels. Check out the videos I have on my channel: https://www.youtube.com/watch?v=KVEl7jgaJ-c...
  20. S

    High Torque Hub Motors

    Hey Yall, I am trying to find high torque, low speed hub motors for my quad bike project. Looking at videos of the mxus 3000, It looks like they spin way faster than I need. i want this buggy to be comfortable climbing hills slowly. Are there any geared hub motors? please see picture. And...
  21. S

    Revolt Custom Motors Contact

    Thread deleted.
  22. S

    Ultra lightweight CV Joint Axles and low RPM Motors

    Hello, I am working on this electric quad bike thing and I want to power both rear wheels with their own motor as shown in the picture. Can anyone recommend a motor for an application like this? It needs to have torque right off the bottom end and max rpm will only be around 500 which should...
  23. S

    Full Suspension Quad Bike Build

    Hi All, I am starting to design this 4 wheel, full suspension, fully electric bike and there is a whole lot I have questions about. First off the bike is primarily designed for disabled people. You will notice the left lever will be pull to go, push to brake. The right lever is pull to go...
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