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  1. snowranger

    Looking for feedback on this battery

    Hi, I am seeing this battery on aliexpress. Claims 21700 liitokala cells 52V 30ah for $249 shipped from China. Its the perfect dimensions for my scooter. Too good to be true? aliexpress link
  2. snowranger

    Tack weld BMC/MAC Clutch

    My clutches have been breaking so often that I am thinking about throwing in the towel and tack welding them. I have been playing around with a 50 amp 120V stick welder but cannot get enough penetration to make a weld. I am a newbie welder BTW. Has anyone else done this? Should I get a 1/16"...
  3. snowranger

    Nuvinci 171 spokes breaking

    I have been running my N171 developer kit with the bbs02 for about 1500 miles. I regularly do 23 percent grades, and love it. The torque must be pretty high because all of a sudden, my spokes are breaking at the nipple end. They are 14ga size. I never had this problem with the BMC geared...
  4. snowranger

    Accidently charged turnigies to 4.6 volts

    I accidentally did this with my 16s life charger on my 12s turnigy lipos. I forgot to charge my regular battery the night before so I decided to opportunity charge my 5 ah emergency lipos and stop them before 50 volts total. Unfortunately I lost track of time, and overcharged to 56 volts...
  5. snowranger

    Yuba Mundo BBS02/Nuvinci (3400 mile update)

    Here are some pics of my latest ride. As my kids are getting bigger, I was finding it difficult to make that final hill to school. With BBS02 and the Nuvinci Developer kit, all I need to do is pedal and brake. I can go as slow as I want up a hill, yet it is also scary how fast this thing can...
  6. snowranger

    BH Emotion Max 700 First Impressions

    I just received the BH Emotion Max 700 as a demonstration unit. I am not yet in a position to cut open the panasonic drive and take power measurements (don't own this), but I can give general impressions of this mid drive ebike. If anyone knows of a non-damaging way, let me know...
  7. snowranger

    Pics of BMC Hall Sensors before replacement

    Here are some pictures of my BMC hall sensors. I thought this hub would make it to 10,000 miles, but one of the halls blew yesterday. This is confirmed by a voltage test on the hall wires while rotating the wheel backwards, and the controller on. The blue one doesn't get pulled down to 0 V...
  8. snowranger

    LVC throttle pull-down resulting in lower top speed?

    I just finished putting together a BMC V2 torque setup for my wife's xtracycle running 12s turnigy lipos. At a nominal 47 volts, I think I was getting in the high teens for top speed (a bit slow but still kind of okay). After splicing in the 1 K ohm resistor into the throttle signal line for...
  9. snowranger

    Original Headway BMS upgrade

    I am running one of the original headway BMS units on my 48V 20ah battery pack, and it only allows about 23 amps of max current before current-limiting. This happens immediately, so I don't think it is heat built up related. Does anyone know what the problem was with these BMS? Was it bad...
  10. snowranger

    Bad Turnigy Pack?

    I have been cycling a few of my Turnigy 20C packs on my hyperion charger. There is this one that seems to be to have a weak cell. The imbalance on charge and discharge has been exceeding 30 mV which shows red on my charger. Does anyone know whether this pack is bad enough to send back to HK...
  11. snowranger

    Parallel or Series Meanwells for RC Charger

    I'm going to buy some Chinese Meanwells to power the Hyperion 142i at 24-27 volts. Does it make sense to buy two 12 Volt units and series connect or two 24 volt ones and parallel? I am thinking that the 12 volt units would be more suitable for powering regular RC chargers if necessary and are...
  12. snowranger

    Headway BMS Question and Charging Voltage

    I have been tweaking my charger voltage to best suit the Headway BMS on my pack. If the voltage is above a certain point (about 59 volts for 16s), the BMS will allow 10 watts at the end of charge continuously. Below this voltage, there is nopower flow at the end of charge. My question, is...
  13. snowranger

    Need a replacement for my Ping

    My Ping has finally bit the dust at just over 5000 miles. There are definitely at least two bad cell groups maybe more. I might try to salvage some of the battery at a future point, but I need a reliable battery now. I am looking for 20 ah with maximum draws of 25 amps. What I am looking for...
  14. snowranger

    Feedback on proposed first RC build

    I've been giving a lot of thought to putting together a dream RC build well at least attainable without fabrication. The basic platform would be a Surley Big Dummy longtail. The drive would be an Astroflight 3210 10-turn motor with Matt's single stage reduction driving a Staton Nuvinci CVP...
  15. snowranger

    Headway Pack Reports

    I am interested in getting a pre-made Headway point at some point, maybe when the new BMS comes out or not. I've heard a lot about the "duct tape" batteries but not much about the current Headways. How does the reliability compare for the batteries and/or BMS? Does the battery...
  16. snowranger

    Ping Cell Replacement with Pics

    As mentioned earlier, I am going to be replacing 3 cells in my 48V 20 ah pack. This is harder than I thought. I removed as much as the solder I could but still can't get the tabs to release. I am stuck at the moment. Has anyone had success with this?
  17. snowranger

    Anyone change out a Ping cell?

    Looks like I will be doing this in a couple weeks. Anyone know what I'm in store for? Do I need any higher power soldering equipment?
  18. snowranger

    E-bikeKit Front Wheel vs BMC

    I scooped up one of those $144 26" front hubs that ebikekit was offering a few weeks ago as a spare to my BMC hub. The wheel arrived well packed in about a week. There was a small dent in the rim, but it doesn't look like it will interfere with braking. The right wire combination that...
  19. snowranger

    Hall throttle - current limiting

    I'd like to find a way to current limit my controller through the hall throttle signal? What's the easiest way to do this without buying a cycle analyst? I have a watts up meter, so I could just use that to adjust things by eye in the field.
  20. snowranger

    How many FETs to replace?

    Looks like I need to order some p75nf75 for the ecrazyman controller. There are 12 of them in there, but I don't know how many need to be replaced. The phase wires are shorted together because the hub is hard to turn. I have a multimeter too.
  21. snowranger

    Crystalyte Road Runner 408R

    Does anyone know which Crystalyte winding type this is? 404, 405, 406, 408, etc. The retailers I called didn't have a clue.
  22. snowranger

    BMC hub - 30-second error fixed in 3 weeks

    I've been running my hub since September in rain and shine. I suspect that it is getting a bit noisier. Are there any maintenance procedures for these motors?
  23. snowranger

    Another DC/DC converter question

    I have a question about how these step down DC converters work. If a converter specifies a certain voltage and amperage output, must your powered device actually use all of that power? Will the converter reduce current if the device does not use it all? I am trying to match leds to a...
  24. snowranger

    Hitron DC converter for lights - DIY Down Low Glow

    I just bought this DC converter to directly feed off the 48 volt battery to power some power leds. See pics. I am not familiar with these converters. Question is what sort of connectors will work with the converter pins and how have people mounted these converters.
  25. snowranger

    Help-Ping Charger Failure - fixed

    My 5 amp Ping charger all of a sudden stopped working this morning. Unfortunately, I am relying on this as a daily commuter. Can someone please diagnose this? There are burn marks under this component near where the plug AC cord comes out. The part number is NTC 10D-20. Okay , the part...
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