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  1. M

    Want advice on electrifying Kona Electric Ute

    I electrified two standard Utes in the past. First had a pair of 500W direct drive hub motors and a 57V battery. The thing would climb anything. Second had rear Magic Pie and front geared 500W Mac. It could do 65kph up a slight hill at 72 Volts. Had both of them stolen. Both had quality...
  2. M

    Are my charged cells within ok range of balanced?

    A friend passed me his highly unbalanced LiFePO4 BMS equipped 12Ah battery. I got no more than 2Ah out of it - it was so unbalanced. Ultimately I got as much as 11Ah out of it. The way I did it was very easy. Connected a hair dryer to the discharge lead, so the charging process wound never end...
  3. M

    Run motor with insufficient amp batteries damaging?

    Keep the BMS. The cells are fine with up to 200A burst. Make sure the rest of battery build is sturdy enough to sustain the peak current your starter will draw. Then build a simple external switching circuit, triggered by BMS output.
  4. M

    Shengyi Motors

    Agree that the difference in overall efficiency will be miniscule, only due to slightly increased switching losses (assuming identical controllers). But maximum torque may be higher on the slower motor at very low speeds because the same maximum phase current can drive the slower motor at higher...
  5. M

    Shengyi Motors

    Provided the controller can't put out more than 30/35A phase current, the slower motor may have about 10% higher torque at startup (under 7-8mph) and will be a hair more efficient. Not much of a difference though...
  6. M

    Neumotor 8057/75 middrive project, belt drive, adding halls, 10kW+

    Hi Madin, I really can't help with belt drives, but before you get into all the trouble of building one, have you tried a MAC on the Votec? I really love the MXUS 3k on my steel fatbike (pic attached). Road bump filtering with the 4 inch tyre is second to none. Even for light trails, the...
  7. M

    Canine assist

    Done that once. More adrenaline than a timed downhill run, everything was out of my control :)
  8. M

    Edge 1,500 and 3.25mm spoke holes and 13ga 2.25mm spokes

    I second Chalo. It's worked wonders for me, on motorized and pedal hubs alike. The key is to move the straight section of spoke as close to the flange as possible, so the J-bend won't get stressed under load.
  9. M

    Turnigy Multistar - lightweight 10C cells

    I ran 10Ah multistars with 80A peak controller and they did get very warm after a couple aggressive rides. 5C peaks are fine. Just make sure you weed out every suspicious pack. It sure IS a costly decision with such big packs. Also DO reconsider building the battery out of high grade 18650s...
  10. M

    20/24" fork dropouts vs 16T high torque Mac motor?

    A modern disc brake with radial master cylinder like e.g. Formula RX, RO or T1 has enough power AND modulation for your purpose. I advise against Shimano Servo Wave or Hope brakes as the few I've ridden had terrible modulation, albeit good braking power. Get a small brake rotor, you will not...
  11. M

    I never had a tire do this before.....

    What brand of tyre do you use? Some manufacturers make too loose fitting (too high diameter) beads and combined with a too small diameter rim, the bead is sometimes not seated properly and allows one side to sit too low while the opposite side is allowed too close to outer rim edge, risking a...
  12. M

    snapping spokes

    Over years, I have encountered 3 principal causes of broken spokes. 1. Radical spoke angle Remedies: Custom drilled spoke holes to get angle over 80 degrees (a 2-hour DIY job) Assymetrically drilled rims (moto rims or Ryde Andra bicycle rims) - loose spoke elbow at hub flange Remedy: insert...
  13. M

    Simple charge voltage limiter board

    It seems to only be advertised for 220V. I'd love to try that for you, but there is no 110V outlet nearby... We are talking the XH-M602 boards however. There is a XH-M604 too, and it's fed directly by DC from charger. Instead of charger power, it switches battery connection. It's limited to 80V...
  14. M

    Turnigy Multistar - lightweight 10C cells

    As long as the discharge curves match each other and the parallel wiring doesn't have to handle excessive current, it should be fine.
  15. M

    Charger Suddenly over charging !!!

    This. https://endless-sphere.com/forums/viewtopic.php?f=14&t=87562
  16. M

    Possible to make a trapezodial motor run on sinusodial cont?

    You have to disconnect everything before performing the motor phase test. But when disconnecting the controller, do it one phase at a time and turn the motor by hand everytime to see if it will make the motor turn easier. That would indicate a short within the controller. I repeat, there is...
  17. M

    Possible to make a trapezodial motor run on sinusodial cont?

    turn the rotor by hand. then connect any 2 out of 3 phase wires together. see if the motor gets harder to turn when phases are connected. repeat this 3 times to check every phase combination (A+B, A+C, B+C). if you can't tell the difference between connected and disconnected, it means the...
  18. M

    Possible to make a trapezodial motor run on sinusodial cont?

    Have you checked if the hall sensors output proper signal? All 3 of them should alternate between zero and 5 volts as you slowly turn the rotor. Also, does the motor turn freely? There can be a short in the phase wiring or windings.
  19. M

    Possible to make a trapezodial motor run on sinusodial cont?

    There is nothing trapezoidal inherent to a permanent magnet motor. In fact, any motor will run more efficiently on a sine wave. If your motor has 3 big phase wires and 3 hall sensors (5 small wires), then it can be run fine by the Sabvoton. I think yours is the case. If it only has 2 big wires...
  20. M

    Will my front fork setup hold or failure?

    secure the torque arm on the right side by welding the two parts together. this will prevent any rotation between them, which would render the whole torque arm useless.
  21. M

    Small pack (2p14s) build

    I think you will be fine, but much depends on gearing, speed, riding style and weight. If your riding includes extended periods at full throttle, the cells may get hot at the end of the ride. What is your estimated average current draw and ride time?
  22. M

    Monitor and Charge 10s Pack

    You have a very good quality pack to start with. Do not spoil it with a cheap BMS that can fail without warning, nor with a monitoring device that draws power from selected cells and unbalances your pack by design. You will be fine with a single cell log and just a brief check before charging...
  23. M

    Cant find 72v /60a controller with regen.

    Do you use organic/resin, or metallic pads? Metallic are much more durable.
  24. M

    AllCell Battery Fire

    The controller can still have power even when BMS is tripped. Many of my controllers generate voltage when motor turns. High enough so that the led lights turn on just from pedaling without battery. In certain situations the voltage may be high enough to power the controller and enable regen...
  25. M

    11-50T Cassette on Cute Q100CST Setup

    A motor can be run at almost any speed. Efficiency will be lower at 5 MPH, but if torque is kept low, it won't overheat. It's always nice to get a little kick at steep climbs.
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