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    12v power pack from 18650 cells

    Hi guys, I want to build a 12V pack from 3s or 4s 18650 cells. I want to use the pack for my telescope and mount. What I don't know is what voltage stabilizer to use. From my undestanding the step-up/step-down dc-dc buck converter changes the output voltage if the imput voltage changes. I'm...
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    PAS wires signals

    Hi, It is normal that from the controller on the PAS signal wire to have +5V? When I connect the PAS sensor the voltage drops to +1.7V and the controller is not running. I have a problem with this controller wich dose not want to work on PAS.
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    Power controller 24/36V

    Hi, I have a controller that works on 24V and 36V. I have a bike with 24V battery but when I connect it to the controller I don't have enough power. On a 36V battery works perfect. How can I make the controller to work with the 24V battery? It has the learning wire but I don't know how to...
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    DIY eBike supplier in Europe

    Hi, I want to buy a DIY ebike kit from Europe (EU) and I don't know any supplier. Do you have any recommendation? But from Asia, do you have any recommendation for a reputable supplier? Ebay or Aliexpress? I want to buy a front/rear wheel 36v 250-350W kit (with battery) but I want to buy...
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    Controller schematics, help!

    Hi, I have this controller and I don't know what those wires do. The wires that are not connected. So far I have connected: - the motor (power + hall) - power wires - throttle - pas sensor I guess some are from the brake but which? And the others? Can someone help me? :)
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    BionX SL 250 HT RR XL battery pack - cells replacement

    Hi, I have a BionX SL 250 HT RR XL 13S4P battery pack with low capacity after some use. I want to change all cells. The actual cells are Samsung ICR18650-22P. The replacement cells I would like to be Samsung ICR18650-30B because they have the same chemistry and are rated to 10A discharge like...
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    Suppliers/dealers for kits and parts

    Hi, I would like to sell e-bike kits and parts in my city. Which is flat with a few small hills (less than 200 m long). At the moment the e-bike community is almost zero and I want to see more e-bike users. So I'm looking for a supplier from where I can buy parts and kits to sell in my area...
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    Fuse cells 18650 diy pack

    Hi, I've seen this videos: 1) https://www.youtube.com/watch?v=5EE4TsuzD_Q 2) https://www.youtube.com/watch?v=raBWFsPlx7w My question is, why diy battery builders are not using fuses for every cell from the pack? What are the disadvantages? I want to build a pack like this and I don't...
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    Are any good those cheap 10$ BMS from eBay?

    Hi, I've build my first battery pack (10S4P) a few weeks ago and I realized I've made some "mistakes". Now I want to rebuild it and also make another battery pack. In my first pack I've used this BMS...
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    Help with the 861 LCD menu

    Hi, I have an electric bike for 1 week and I didn't figure it out all the menu options. So please help me. The motor is Bafang SWXH 250W 36V and the LCD is 861. 1) How do I close the lcd light? It is all the time on. 2) How do I setup point P07? I have 20 magnets in the motor and if I put...
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    Bafang E-SWXH-R 36V 250W motor hub sound/clunk

    Hi, I have a Bafang E-SWXH-R 36V 250W motor hub mounted on a bike. And after my first ride I noticed a sound/clunk when I power the motor. Without the power there is no sound. You have a video here with the sount. https://www.youtube.com/watch?v=Ati6KHXiXB8&feature=youtu.be Can you tell...
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    Connecting BMS to battery

    Hi, I'm building a 36V 10s4p Li-Ion battery. I have a BMS from eBay and some instructions that are not very clear for me. My question is, what wires from the BMS I connect first, the signal wires or the P-, C-, B- wires? I've attached the instructions that came with the BMS.
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    DIY MOT spot welder for 18650 cells

    Hi, I'm building my first ebike. And I want to build the battery pack. I've ordered the cells and 0.1mm nickel strips and now I'm working on a spot welder made of a microwave transformer. But I have some questions. What amperage I need for welding 18650 cells? I'm now at 25A powered from 220V...
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    Charger and BMS compatibility

    Hi guys, I'm making my first electric bike and need some help with the BMS and battery charger. I'm using a Bafang E-SWXH-R 250W hub and controller. I've bought 40 Panasonic 2900mA cells for making the battery and now I want to buy the BMS and charger. The BMS will be like this one...
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