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  1. Dui ni shuo de dui

    Rewinding a QS 273 motor

    Hello everyone, A good friend of mine unfortunately fried his motor recently. It looks like one of the phase partially melted down. He dropped the motor off to my place yesterday and now I'm trying to see if I can rewire it. That would be my first time attempting this task, so I thought I'd...
  2. Dui ni shuo de dui

    Modular Battery suitcase

    Hi Everyone, As I received a nice little suitcase together with my FarDriver Controller, I decided to use it in order to make a 48V battery system. The main goal here is to have a backup battery to power fridges and other important equipment during a power outage, and to have it compatible with...
  3. Dui ni shuo de dui

    Electric Roadster

    Hello Everyone, Yesterday I was lucky enough to score an old electric motorbike for free. It is almost exactly the same as my sports bike, but all the plastic parts on this one are broken. The plan for this one will be to make it a lightweight roadster. The bike was stored outside for...
  4. Dui ni shuo de dui

    RC ESCs in a real size motorbike? How stupid would that be?

    Hi guys, I came across this thing, which is a ESC for hobby remote controlled race boats or surfboards: https://www.aliexpress.com/item/32693130599.html?storeId=513485&spm=2114.12010612.8148356.53.51fd57c3ih4PQ3 800A per phase, apparently a 1000A/phase version exists too integrated BMS...
  5. Dui ni shuo de dui

    Can Flux Weakening mess with the hall sensors?

    Hello guys, I recently started to have a weird issue with my motorbike. Sometimes, when running at high speeds, the bike will suddently have what feels like a big burst of regen braking, then the controller would cutoff. This happens when I have the throttle either wide opened or slightly...
  6. Dui ni shuo de dui

    Different voltage from input to output of the BMS

    Hello everyone, I have a weird issue on one of my old batteries: 24S LiFePO4 When I connect a multimeter to the output wires of the battery, I read 67V. But when I measure the voltage from the input of the BMS to the positive of the battery, I read 78V, which seems like the normal voltage the...
  7. Dui ni shuo de dui

    What is the actual, real meaning of "Peak" ?

    Hello everyone, Usually, when we talk about batteries, controllers and so on, the two ratings "peak current" and "continuous current" rapidly appear. I understand the general principle of what is a peak and what is continuous, but is there an actual standard who scientifically defines what is a...
  8. Dui ni shuo de dui

    Solid State relays Controller?

    Hello everyone, Please forgive my noobness if this is a silly question, but I was wondering if, according to you, it would be possible to build a controller power stage out of DC-DC Solid state relays. The point being that it would be very easy to swap those in case of problem, or even to...
  9. Dui ni shuo de dui

    Sabvoton Mods: How to make this controller even more powerful?

    Hello Everyone, I have the great pleasure to own 2 sabvoton controllers. One new version 150A and one old version 200A. Those controllers are, in my opinion, absolutely awesome and I love them. They are reliable, easy to set up, provide a very nice ride and are not very expensive. Problem is...
  10. Dui ni shuo de dui

    High Power Connectors: Which Ones?

    Hello Everyone, I'm currently going through the process of sourcing all the little hardware for my build, and right now I'm searching for the best compromizes in tems of power connectors. A little reminder of my config should help: 2 batteries in parrallel. Each battery is 72V and 40AH, so...
  11. Dui ni shuo de dui

    A123 20AH LiFePO4 cells interconnexions

    Hello guys, I have a nice opportunity to purchase some A123 20Ah pouch cells, and I'm now wondering what method I should use to connect them together in series. My main problem is that I don't have a lot of space and I plan to build a rather huge battery (24S 4P, so about 72V 80Ah). So...
  12. Dui ni shuo de dui

    Prismatic cells: the easy way to lithium?

    Hi Guys, I currently have a 72V 35Ah lead acid battery on my motorbike. It works nicely, but I find it quite a bit heavy and It only have about 35km autonomy at full speed. And now that winter is coming, the autonomy starts to drop. So, I would like to upgrade to lithium. I've spent a great...
  13. Dui ni shuo de dui

    Controller mod, what can I do with it?

    Hi guys, I have a few controllers that I don't use, since they are not powerful enough regarding my needs. I think I have 5 controllers of 80A and one other of 100A, just classic random chinese square wave controllers. Most of them Yuyang King. Anyway, I would like to use them to experiment...
  14. Dui ni shuo de dui

    Ninja 250 "Clone" Made in China

    Hello everyone, A little topic to present my new e-motorbike. Specs: -Motor: QS 3000W V3 High speed version -Controller: Currently tested: Yuyang King 100 Amps, Sabvoton 150 Amps and Sabvoton 200Amps (battery continuous draw, not phase amps) To be tested soon: Kelly 12401, 120V (200Amps...
  15. Dui ni shuo de dui

    Use two average controllers to build a better one

    Hello Everyone, I have something in mind, but I'm not sure if this could work. Here it is: I've got two identical controllers (Yuyang king 80A). They both equally suck. One of them doesn't work anymore, but I'm pretty sure it is the logic part which is fried, and not the power stage. What I...
  16. Dui ni shuo de dui

    Topics classification

    Hello, I know I'm new on this forum, so I'm probably a bit too optimistic about creating such a topic right now, but would it be possible to better separate the different machines on this subforum? I mean, we mainly find 3 types of vehicles there: little stand up scooters, moped (which are...
  17. Dui ni shuo de dui

    Ultracapacitors: how to?

    Hello everyone, I've seached a little bit on this forum and did not managed to find any interesting information regarding ultracapacitors yet, so I've decided to create this topic, which hopefully will help me among with other interested people to gather as many information as possible on this...
  18. Dui ni shuo de dui

    My Chinese E-Scooter

    Hello everyone, I recently discovered your forum and didn't found any specific category in it to introduce myself, so I guess this one is probably the most appropriate to do so. I'm a French guy living in China for a while, and I own this scooter for almost two years now. This machine evolved...
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