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  1. Santacruz

    Supplies for frame building

    Hi all, This looks to be a very promising sub-forum. Having built my own stealth type bike from design to construction (and successful riding :) ), I thought maybe it would be useful to have a list of suppliers, for parts. So I have here just some of the companies I used when sourcing some of...
  2. Santacruz

    Strange power loss with Sabvoton 96120 and QS273 (SOLVED)

    Hi all, I am hoping I can get some help with the following problem. I have a strange power loss problem with my set up. Apart from this, it is running perfectly and doing what it should. The problem I am having:- When fresh off the charger 90.2v (22s @ 4,1v per cell), I get maximum power...
  3. Santacruz

    No sine wave with field weakening selected?

    I was reading an article about a controller and it was stated that with field weakening the controller becomes square wave. This is news to me and raises some questions. I have a Sabvoton 96120 running a QS273 motor and have field weakening set to 50amps. Is it correct that the controller is...
  4. Santacruz

    Question over different pole pairs in motors

    Hi all, I have searched, but not really found a simplified answer. That is pole pairs in a motor. I take as an example, MXUS 3k - 23 pole pairs and a QS205 3k - 16 pole pairs. So one has 46 magnets and one has 32 magnets. Does this have something to do with RPM or torque or even reliability...
  5. Santacruz

    Most powerful rear hub motor for ebike

    Hi all, Sorry if this is in the wrong section, but I see no section for rear hub motors. I have also searched and not been able to find my answer. My question is:- Is the QS273 the most powerful rear hub motor for a bike, or are there others I don't know about. My present build is a stealth...
  6. Santacruz

    My new stealth type build

    This is the finished bike I have been building for over a year. I made all the frame and rear swing arm. (I copied various sections from different Chinese models and improved them - That should balance things out :D ) Modified 3K turbo motor (+Hub sink and statorade), 22s5p 26650 battery...
  7. Santacruz

    SMVC96120 + CA3 + regenerative braking

    Hi all, I am busy wiring up my new bike build and have solved a few wiring problems regards throttle connection etc. But I am a bit stuck and confused on the regenerative brake set up. I will running through a CA3. This means the only control to the controller is via a throttle signal wire...
  8. Santacruz

    CycleAnalyst CA3 and temp sensor connections

    Hello all, I am busy building my new project bike and have a question. Motor is 5kw rear hub with 2 x hall and 2 x temp sensor wires. I don't know if the temp sensor is 2 x in the motor, or if there is just one with 2 x wire coming from it. I am using a SMVC96120 controller. The controller has...
  9. Santacruz

    Shunt resistor connections for aux.

    I am currently building my bike. Sabvoton 96120 controller and external 200amp 60mv shunt. (As I will be running a cyclanalyst 3). My question:- I am also running a DC/DC converter and the BMS screen that runs off battery voltage. What side of the shunt resistor do I connect the ground for...
  10. Santacruz

    Sabvoton 96120 to CA3 throttle resistor (Solved)

    I will be externally wiring up my Sabvoton 96120 to a CA3. I am in the process of making the CA3 6 pin wiring and plug. Can anyone tell me if a 2KΩ resistor is needed in the throttle signal wire, from CA3 plug to throttle signal input on Sabvoton 96120.
  11. Santacruz

    Best location for external shunt

    Hi all, In the current build I am doing, I will be adding an external shunt (To supply a CA3). My question is, where is the best location for this shunt. Should it be neg straight from battery (Before BMS), or should it be after the BMS and before the controller. Or is this not important.
  12. Santacruz

    200amp shunt for CA3

    Hi, I am looking to get a external shunt for connecting CA3 to my bike build. I have seen some that are rated at 1.0 mOhm and some at 0.5 mOhm. What is the difference and what is best.
  13. Santacruz

    PowerVeloCity F18-100 controller, not working

    Hi all, I have for sometime been building my new bike. I will try to keep this simple and straight forward. I finally got to the point of switching on to test and set up, but nothing. I have one of those Chinese hall testers. Using that, Motor phases are ok. Motor halls are okay. Plugged into...
  14. Santacruz

    Need help identifying a Mosfet

    I was looking to upgrade my BMS with better mosfets and new copper bus bars. But I am unable to find any info on the mosfets fitted - SEM013T36D 0213 801 BMS is a smart bluetooth BMS 24s 150A It looks well made, but if I can improve it I would like to. Any help would be appreciated in...
  15. Santacruz

    PAS on Cycle analyst 3

    Hello, I have the latest Cycle analyst which I am wiring into a new build. I want to use a standard 3 wire PAS control, but I am a bit confused with the new Torque/PAS plug. I am using 5v from the aux. Ground is okay. What I would like to know, is which of the 3 remaining wires (10v not used) do...
  16. Santacruz

    BMS with lipo's

    I have the chance to get some single cell lipo prismatic cells. I will be making a 20s3p pack. As these are single cells in aluminum cases and if I am right, the voltages are similar to lithium ion, can I connect them up with a BMS. (Bms that can go up to 24s and do Life,Ion and T.O. cells) I...
  17. Santacruz

    Some small problems with Cycle analyst CA3

    Hello, I did make this post in the old Cycle analyst topic, but it does not look like it is being followed anymore. It is some time since I made a post, but I have a question about my CA3. I have been using it for over three years now without any problems. My MTB is running rear bldc at 2000w...
  18. Santacruz

    Metal planetary gears?

    Hello. I am new to this forum and have just built a mtb ebike. 36v qq-m128r rear motor. Brushless.hall sensor and geared. I have read about replacing one or all of the nylon gears with metal ones. My question is. Where do I get these from. I can only find replacement nylon ones. Is it best to...
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