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  1. F

    250W PAS build recommendation

    My thoughts, forget the parts you already have (displays and controllers are dirt cheap). Just buy a suitable package of AliExpress that is built around a KT display and controller of about 25A. A rear hub 750w or 500w motor weights no more than a 250w motor. So if it were me I'd go 750W. A...
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    Place to buy JST-SM 2-6 connectors

    If you're in no hurray you'll find them on Aliexpress. If not already, you'll definitely need a pair of the correct type crimp pliers. Aliexpress also sells the crimp tool (IWS-3220M) which does a perfect job, every time. Everything else I tried made a hash of the job.
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    Dual identical batteries in parallel safety/simplicity Questions

    Maybe English isn't your first language, because your first comment was nothing like the second. Yes, in the context of your second response the first takes on a different meaning. However on it's own it was not unreasonable to believe you were supporting the person who had no faith in them...
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    Dual identical batteries in parallel safety/simplicity Questions

    You seem to be suggesting two similar voltage batteries can simply be bolted together in parallel, and the BMS of each battery will manage the situation. That doesn't sound right to me. If these dual battery connecters do more than that, regardless of how technically complicated they are, they...
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    Dual identical batteries in parallel safety/simplicity Questions

    Maybe a dumb question, but why not simply use one of the 'smart' devices designed to connect two similar voltage batteries of any size together in parallel. The Chinese ones are only about $40 for a 30A model. Come in ranges from 20A to 80A? Physical size gets a little larger the higher the...
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    KT Controller recommendation

    About the only wisdom I can add to your question regarding compatibility of KT clone displays to genuine KT controllers is my sole experience. Bike came with what I believe is a KT clone display (part number on the back does not start with KT), and a generic controller. Replaced the...
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    Those motor/controller testers DO NOT Work.

    The best investment for the problem you mention is no more that a cheap pack of test leads (or make them yourself). The simple bits of wire with a small alligator type clip on each end. No more mucking around trying to hold ever thing. Just clip it all up, and complete hands free to watch the...
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    poor mans steering damper. advice?

    The relevant bit of the article your linked is "However, you might also want to try sliding your fork tubes down in the triple clamps a couple millimeters. This will slacken the head angle and make the bike more stable in a straight line and less likely to headshake." While the author may have...
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    Those motor/controller testers DO NOT Work.

    No, not foolish for purchasing the tester, just part of the learning process and the thing was dirt cheap. I feel foolish for not pushing the juliet connector all the way home which was the initial problem of why there wasn't 5v at the hall power line. I learned a lot in the frustrating...
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    Those motor/controller testers DO NOT Work.

    Looks the same as a thousand other ones posted for sale on the internet, with the only 'band' name being "Bo Ai Zhi" with "Made in China" underneath. When I checked reviews on Amazon (could have been another supplier) there were a number of people who said they didn't work, that is my...
  11. F

    Those motor/controller testers DO NOT Work.

    Such as? I was able to determine the motor was 100% fine by comparing the resistance of all the phase wires, and that the hall sensors worked correctly by checking the voltage of the hall wires, while putting 5Volts into the red/black lines, and rotating the wheel. As well check 'chugging' by...
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    Those motor/controller testers DO NOT Work.

    A post, just so it may be helpful for someone in the future...... After spending MANY long hours trying to find why my new controller (KT Sine) was throwing an error (motor position sensor fault on a KT LCD8 display) when being checked with one of those relatively cheap Chinese motor/controller...
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    Lowering controller amperage

    The bike has never actually run, other than a couple initial test spins with the rear wheel raised. Then it completely died. I'm still waiting for one of those test box things to arrive to confirm what the multi meter tests show, that one of the 3 phase wires from the present controller is an...
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    Bafang 250, 350, 500 hub motors

    If indeed the 250W, 350W, and 500W motors are really all the same (they all have the same torque spec e.g. 80Nm, and weigh exactly the same) and it is just marketing spin, that's straight out fraudulent misleading conduct on the part of Bafang. Just allow retailers to charge people more...
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    Bafang 250, 350, 500 hub motors

    Thanks for the reply. Just a little confused (nothing unusual about that). Are you saying the 250-500 are absolutely identical and it its just marketing spin, or the number of winding is different between the various size motors?
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    Bafang 250, 350, 500 hub motors

    When I look at the Bafang website, the G060 250,350, and 500W hub rear fat bike motors all share the same technical data sheet. Same dimensions, same torque, same weight. Only the 750 version is different, being heavier and a little more rated torque. So my question is what IS the difference...
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    Lowering controller amperage

    Hi AW, Thanks for the detailed response. Yes the battery is a 48V integrated fork tube battery. The hub is a geared hub, looks like a typical Bafang but doesn't have a branded sticker on it. It's serial number includes 250W48V so there is no doubt what it is. You've convinced me, I can get a...
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    Lowering controller amperage

    Sorry if this question has been asked before, likely has. Bought a POS Chinese bike from an online sleazy vendor (yes I should have spent more time checking him out first) and are now trying to get it going. I've basically run the problem down to a faulty controller. It's up inside the top of...
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