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  1. I

    em3ev bulk chargers with switches

    does anyone who has one of their controllers with the switches to pick 100% 90% or 50% SOC ever opened it up to see how their switch changes the output voltage? I'm trying to see if its worth buying their bulk charger or if its just a switch with an inline resistor.
  2. I

    Phase vs battery current for most efficient setup

    I was reading through some threads on phase/battery current.. the general consensus is to keep phase current about 2.5x battery current. And with a block time of 1 second, this is now setups come "stock". Then I also read, specifically from mwkeefer, that lowering the phase current to just 1.5x...
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    Custom Long Tail Build

    I figured its about time I unveiled what I had slowly been working on since December of 2012. It's come a long way, and I'll try and cipher through what went on with the bike. First, my goal was to build a commuter bike that I could effectively use as a downhilling bike as well. It's since...
  4. I

    Bottom Bracket and Swingarm Pivot Same Point?

    We've all seen threads where the bottom bracket is built in front of the swingarm pivot.. like DrunkSkunk's build: We've also seen some builds where the bottom bracket is built into the swingarm itself.. like Peter's build: This build does eliminate the issue I will speak about in a second...
  5. I

    Motor moving without any throttle input

    Cell_man 18fet 4110 controller. Basically was running well on my dirt bike with x5404. Then I swapped it over to my GM hub. Trying to find the combination for phase/hall again, I hooked it up and right when I turned it on it was already moving. It was the wrong combination so it stuttered really...
  6. I

    Modifying lead acid charger for lithium batteries

    As you all know, lithium batteries use a CC --> C/V method for charging lipos. Lead acid chargers however use CC --> C/V --> Float charging, making them not suitable for lithium charging (BOOOOM!) Anyone know how to modify the chargers from lead acid to lithium, aka turn off float charging...
  7. I

    Idea for cheaper alternative to phasor/stealth type frames

    An idea just came to my head while thinking about frame building. I've done a build from scratch, welding together a bike and all.. the hardest part was the headset/bottom bracket bunch in terms of buying metal and fabricating a swingarm. I really like how the phasor and stealth frames are...
  8. I

    mx500 dirt bike with x5404

    Okay, going to keep this short and simple as I just need a place to document all I'm doing. Razor mx500 electric dirt bike x5404 scooter style motor 18fet 4110 infineon 60a controller 20s2p lipo original bike got it used without batteries for $80 with new front tire included: x5404 scooter...
  9. I

    another BMS battery type charger qualm

    Im wondering if this has happened to anyone else and can explain it.. when setting the bulk charger to say 54.6v in my case for 13s lipo.. sometimes the charger will "jump" and output only 27v until I unplug and replug it in. This renders my BMS worthless as its balancing the cells, but once it...
  10. I

    BMS issue, not charging?

    Figured it'd be much quicker to ask the question here and get a response than through email with the supplier who can barely speak english. I got this BMS: http://item.taobao.com/item.htm?id=15894708275 Anyway, the connections seemed simple enough, the negative of the battery goes to B- and...
  11. I

    Yay or Nay? Lipo BMS

    Here's the info I got from a supplier (translated with google): Technical parameters: Dimensions: L * W = 110mm * 85mm protective plate thickness: 10mm Balanced current: 80mA (VCELL = 4.20V when) Balanced from the handle: 4.18 ± 0.03 V Overcharge threshold: 4.3 ± 0.05 V Overcharge delay: 75mS...
  12. I

    Modifying Norco frame.. need advice

    So I'm trying to get the controller inside the frame, which looks like this: The controller fits perfectly into one area: The problem is that the frame is aluminum. Is the only way I'll be able to do anything to the frame is by tig welding? I'd like to be able to have one side able to be...
  13. I

    CA limting- what settings have worked for you?

    For those of you with high power setups, what settings on advanced have you guys settled on? It will help to state what your bike powers without limiting, what you're trying to limit it to, and what your settings are. For me, I run a setup that pulls 2800w peak.. I tried limiting it to 1800w...
  14. I

    Cycle Analyst Limiting issue

    I tried wiring up the limiting today on my CA SA model v2.23. Schematic wise, I followed everything according to the circuit scheme, but now when I turn on my system, it automatically already gives throttle I luckily had my bike on a stand but it was still pretty scary.. could anyone advise me...
  15. I

    What did you do to your ebike today?

    As many forums have this kind of topic thread, I thought I'd start one here (presumably we don't have one, I haven't seen one at least) Post what you did to your ebike today! I'll start: Today, I upgraded from 20s lipo to 24s lipo, just joined the 100v club on my Hua Tong Controller! :D...
  16. I

    Mosfets blown- help me identify the ones I need to replace

    Hey guys, I know some fets are blown, and I've used my multimeter to do some tests to try and figure out which fets are blown. From what I understand, my 15 fet controller, each phase has 5 fets for its use. 2 are "high" and 3 and "low". This means that every first two fets, the "highs" on each...
  17. I

    Iovaykind's Novara Method 1.0 Build

    Current State of Ebike Current Weight: 57lbs without batteries Top Speed Achieved: 42.6mph Range: @25mph - 35 miles without pedaling (15ah 20s lipo) Battery Pack: Varies between 5ah, 10ah, and 15ah worth of 20s lipo. Intro The equipment will be taken from my second ebike, which has been...
  18. I

    Regen through battery gauge meter?

    Something I noticed today (probably not news to many of you) is that when I pedal really fast, even without a battery hooked up, I get full battery on the gauge. I checked through the battery plug to see if I was getting some voltage, but failed to see anything, meaning the controller doesn't...
  19. I

    Seems my 10ah battery is now considerably less?

    I don't know what to check first. Lately, it seems my battery has more voltage sag (maybe due to lower ah for some reason?). I used to be able to get two rides from and to school before I had to charge, but now I only get maybe one back and forth and a little bit more. What could be the cause of...
  20. I

    Upgrading from Imax B6 (copy)

    Okay, so I'm on my first charge cycle and I already can't stand how slow charging at 50w is.. my 10x 4s1p 5000mah hardcase packs need something juicier and I need to save time, not so much money in a case as extreme as this. It should take about 8hrs to fully charge the packs, I want to cut that...
  21. I

    Can I full throttle my ebike with lifepo4?

    I'm just wondering if its bad for my batteries to be full throttling it and pulling the 17amps that my controller can deliver. Here are some specs: 36v 10ah lifepo4 battery. 1c (so 10 amp continuous) and 2c max (20amps) controller is 17a +-1a When it says 2c max, does it mean 2c for say 1...
  22. I

    Leaving lipo balance tabs connected

    Hi, lipo noob here.. just bought my first set of lipos and considering charging options/making it most plug and play as possible. I've read that parallel balancing/charging is possible when cells are in close voltage to one another. I'd also read that monitoring for bad cells can be done every...
  23. I

    Iovaykind's Second Ebike Build

    Less than a month into my first bike I'm already itching for more speed and power. Didn't know that Lifepo4 wouldn't be great for high amp ratings, but now I've gotten into lipos. Going with 16S for now. Ill see where I'm at in terms of speed, and if I still itch for more I'll go with 20s by...
  24. I

    5s or 6s, can't decide

    So I've got a 36v ebike, do I go with 5S lipos or 6S? How can I tell if my controller/motor would be able to handle it? Sorry if this has been covered, the search function hasn't exactly helped me find what I'm asking about. I'd have no problem "overvolting" it if need be.. the lifepo4 i'm using...
  25. I

    Iovaykind's First E-bike build!

    Not going for anything spectacular here! Only trying to save money on my commutes to school. This is the frame I'm working with, will be mounting batteries, controllers and all into the triangle. :edit: anyone know why the picture comes out like that? hm, either way, if you open it up in a...
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