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  1. B

    12v power pack from 18650 cells

    I think I will use a step down convertor than. Thanks you for the info.
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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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    DIY MOT spot welder for 18650 cells

    I also had some problems with the power supply for the arduino. When I was using 9V it was freezing after a few welds. So I now use a 5V usb power supply.
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    DIY MOT spot welder for 18650 cells

    Hi Marty, Nice welder you are building. That was my plan too, to add a display and a dial and not to use the computer to change the time. But i'm not that good at arduino and the friend that helped me is busy now. Maybe you could share you design because I would like to make it nicer and not...
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    PAS wires signals

    Or it is the 3 speed switch wire? Because I'm not sure.
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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

    Yes, is running ok. Not as fast as with a 36V battery but it spins. With weight on the bike it has no power to move forward, with no weight on the bike it moves forward. What I'm missing is the torque.
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    Power controller 24/36V

    With me on the bike and full throttle the bike is not moving. That low the power is. The wheel is 20" and the battery voltage is about 26V. I can make some changes or I have to buy other controller?
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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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    Help making mismatched throttle/controler work

    Hi guys, I have a problem with a controller, I don't know how to connect the Anti-theft Cables (two power and three signal). Could you please help me? :D
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    Fasttech issued me a refund?

    I'm waiting for 12 cells of Panasonic NCR18650PF send on 16.02.2016. They sad it will open a case at the local postal office that could take 60 days to find out what happened with the cells. I've ordered from an other seller meanwhile.
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    Controller schematics, help!

    Hi, I managed to find that connecting the white wire to positive (+36V) the braking takes place.
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    BionX SL 250 HT RR XL battery pack - cells replacement

    I return with news. The battery works perfectly. From the first time. So you can change the cells for this type of battery. One thing you have to take in to account. At the reassembly i managed to snap a SMD from the board. I don't know how. So you have to take a lot of care when you...
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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!

    You are right. You guessed well all the connected wires. This controller was from an electric scooter that had a motor with a single sprocket. I did some measurement today and the blue wires have +5 volts between them. And they go to a plug that splits in two separate cables each one single...
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    Controller schematics, help!

    Anybody?
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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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    18650 spot welding -how to- ULTIMATE REPOSITORY

    Try this: https://www.youtube.com/watch?v=dNNqSXgj6DE
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    18650 spot welding -how to- ULTIMATE REPOSITORY

    I think all battery that has space/spacers between cells has it for not touching from each other. And every big manufacturer dose that, it has some type of spacer, it is safer. If the glue snaps (small probability although) you will get cells rubbing from each other and finally short out.
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    BionX SL 250 HT RR XL battery pack - cells replacement

    A few more info. I managed to replace the cells and reassemble the pack. I tested only with the charger and Monday or the next day will test it on the bike. It was very difficult to change the cells due to complexity. The cells had a very strange arrangement and the case it is just to tight...
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    DIY MOT spot welder for 18650 cells

    Depends how obsessed you are with the welder. If you remove some strands it will work perfectly but if you want it to look nice you have to find another solution. Change the cable or do like flangefrog recommended drill a bigger hole, remove strands and use heat tube to isolate and make it look...
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    DIY MOT spot welder for 18650 cells

    I think is more than enough for the wire. If you have 1.5 turns or 3 is not a big difference. I would choose the biggest wire for more power than a smaller one for more turns. It dose not mater how you put the coil if you work with AC. All the parts were bought from eBay, except the MOT...
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    DIY MOT spot welder for 18650 cells

    The bigger the wire the better it is. But you have to choose a wire that is flexible too and that fits your MOT. I used 16mm (5 AWG) copper wire and works great. My wrapping is called 1.5 turns. I think it is enough. If you use very thick wire you will not be able to do more turns. The...
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    18650 spot welding -how to- ULTIMATE REPOSITORY

    The welded spots look very dark and I had this only on nickel plated steel.
  25. B

    18650 spot welding -how to- ULTIMATE REPOSITORY

    Are you sure you are using pure nickel strips? It looks like steel plated.
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