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  1. L

    Puma CST or Banfang CST for KT controller?

    My q128c (9rpm/v) mounted in a folding bike with 20 inches wheel is trashed. It just stopped running and it is making strange mechanical noises even unplugged. I was powering it with a KT controller that I adapted for 52V/20A (14S battery). It did not last long, maybe 1000-2000km.... So I am...
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    Best 21700 downtube case?

    I am looking for a downtube battery case to host my new 13s3p pack (with Samsung 40T 21700 cells). So far, Nick from Reention told me of a new model 4C-21700, but I can't find it anywhere. Also I know there is another one from Hailong, but to be honest they look a bit too plastic and shit, am I...
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    New project. Q128c, folding bike.

    I am converting one folding bike 20 inches that I have around here for a relative. I am planning to use a <150mm motor, I think the q128c 328rpm 36V would be a good choice. I can overvolt it to 48V, or perhaps better at 52V? I aim for 40kph loaded. My other option is a Mxus XF15R 440rpm at...
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    wye/delta switch on q100h?

    I am powering a q100h 260rpm (on the front) with 48v and 20amps with a Kuteng controller. Already for several years, running fine. I am achieving a top speed of around 40km/h on 700c wheels. I see that, at that speed the wattage drops down to 400-500W (from around 700-800W), due to the battery...
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    frameset with sliding dropouts and integrated battery?

    Hello, Does anyone know of any brand, or anyone around here that can supply a basic frameset (I dont care if it is a mtb/trekking or road frame) but with integrated battery in the downtube and sliding dropouts for Nexus/Alfine? All frames that I see are either full suspension, or meant for...
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    Software to wire battery pack?

    I have a pack layout like this: And I need to wire this as 10s4p. I cannot find from the top of my head an optimal wiring model. Is there any software that can automatize this and calculate the best wiring? How would you wire it? Thanks!
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    New battery cases?

    Have anybody seen this battery case? I could not find any information about it: https://www.alibaba.com/product-detail/electric-bike-battery-36v-11-6ah_60608127936.html?spm=a2700.7724857.main07.167.6513c713QnVHCM It looks very similar to this one from Luna Cycles...
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    Swapping capacitors S06S. what capacitance?

    I just realized that I changed the mosfets in my s06s, but I did not change the capacitors for 48V. So, everywhere I am reading to change the main 63V capacitor to a 100V one, and the smaller 50V ones to 63V. But what capacitance should they be? The more the better in this case? thanks!
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    q100h + s06s -> cutouts

    Hi, I just finished installing everything. My setup is -13s3p - q100h 260rpm on the front wheel - s06s with fets swapped to csd19506kcs - speed sensor (from bms, with a different magnet on the spoke) - I have extended the motor cable a bit, with silicone cable (26awg for hall, and 14awg for...
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    Light output on S06S?

    Hi, I have got a standard 48V to 6V step down converter, but I would like it to be automatically switched on when I turn on the display (SLCD3). Has anybody done this? Can anybody provide any more details on how to do this? I guess I need a mosfet/relay activated with the light of the display...
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    extra spacer on installing q100h?

    Hi, I am trying to install a q100h on a front fork without disc brake and with torque arms on both sides. With the q100h, I received a torque washer, and an axle washer. Assembling all together, with the torque washer on the outside, my fork is hitting the hub when I tight it, I think I need...
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    USB-C or Hdmi connector for hall sensors?

    Hello, I need a quick way to disconnect the motor and accessories from the controller (as I am planning to carry the controller in the battery bag all together). I thought on using a USB C connector, as it has 12 pins on the upper side, and another 12 at the bottom, I could use 2 pins (one on...
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    Which charger for my 13S3P battery?

    I am finishing an order to BMS, I saw their EMC chargers.... How good are they nowadays? Which one would you choose? EMC600 or EMC900? What would be a good charger, quiet or passive for my 48V batteries? I do not need to charge fast, since I will be charging during the night or at work. Thanks
  14. L

    Which of these BMS would you choose?

    I have to choose a BMS for my home made battery pack (13S). I was thinking on: 1) http://es.aliexpress.com/store/product/Lithium-Battery-BMS-48V-13S-PCM/536657_1342900858.html 2) any of: http://www.bestechpower.com/481v13spcmbmspcbforli-ionli-polymerbatterypack/ 3)...
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    Which sine controller for Q100H @48V?

    Hello, Which controller would do best with a Q100H at 48V? I understand that the S06S won't take 48V without any modification. And I am not sure if the s12s would suit fine the q100h. What about the ones from em3v ? should I go for 6 mosfets or 9? Thanks
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    What is the smallest motor out there? (250W-500W)

    Hi, I am planning to add a removable motor to my bike. My idea, is to make it pluggable into the chain, but for that, I need a very flat motor, that can fit between the wheel and the chain. I am not aiming to a lot of power, just to cruise easily. Are you aware of anything like that? friction...
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    2wd or 4wd?

    Hi, I am starting with my first build. I want to build a 5'' inches pneumatic wheels board (from enertion?, and therefore constrained to a hub of 64 teeth and a gearing ratio of 4:1). I have been wondering why there are so few 4wd setups over here, and I am thinking of possible configurations...
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