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  1. M

    Cell Level Fuse Using 12AWG Wire

    Using 2016 Leaf cells, thinking 12AWG wire would be sufficient to fuse each cell. According to this chart, the fusing amperage without insulation is roughly 235a: https://www.powerstream.com/wire-fusing-currents.htm This makes the fusing current about 5 or 6C. Any tips or tricks before I...
  2. M

    K2 LifePO4 26650 Cells

    Found this listing while browsing Craigslist this morning - It's not my listing and I don't know the guy... wondering if $0.24/wh is a good deal for these cells of unknown age, they are apparently new. http://portland.craigslist.org/clk/tls/5988235081.html
  3. M

    New Leaf Battery Modules

    Does anyone here know about the new Leaf battery modules? They are apparently 84ah and for the SL model, a big jump from the 64 or so from the previous generations. Are they the same size? What's different about them? The people at hybridautocenter.com weren't able to tell me the difference...
  4. M

    Regnerative Braking

    I have a question about regenerative braking - People are always talking about how if you're pushing the limits of voltage for a controller and regen kicks in, you could do some damage (blow caps, fets, etc...). I did a search on this and nothing came up, so I thought I'd ask you guys. My...
  5. M

    Hub Motors for Cargo Bikes

    Hi all, I'm back from a 5 year hiatus - I had to scrap an electric motorcycle project in my senior year of college because I was starting to fail classes! I'm back now with a full machine shop at my disposal and wanted to start off with something simple and functional, so I'm thinking of putting...
  6. M

    E-Chicken Tractor

    Hi all, I'm in senior design for Mechanical Engineering at Oregon State University, and my group is designing a fully-automated chicken tractor. Basically it's solar-powered, fully automated (moves a certain distance in a given direction per day, think "roomba robot"). The main microcontroller...
  7. M

    Castle Creations ICE 200

    I know this isn't an ebike, but the people that post in this forum seem to be the most knowledgeable when it comes to rc controllers. I'm considering using an ICE 200 to power a hub motor in a stokemonkey configuration to move a 350lb kart in rough/muddy terrain (a garden plot). If there was a...
  8. M

    Hall Sensor Installation for HXT 80-100

    Hi all, I've decided to mount some internal hall sensors on my two hxt motors. I've been doing a lot of searching and have found out that I need to have 120 degree spacing, or one hall every four slots. I have a few questions that I couldn't find out through the search function: 1. How do I...
  9. M

    Internally geared hub as a jackshaft

    This actually isn't for an electric bike, it's for my downhill bike. It keeps destroying derailleurs, and I've decided to use an internally-geared hub as a jackshaft to eliminate the need for a derailleur. I figured that this would be the best place to ask my questions because of the wealth of...
  10. M

    DC to DC Converter?

    I have an led headlight that needs around 3-4V input, and contactor that can take 12-24Vdc, and two fans that need around 24volts. My battery pack is about 80v. Is there such a thing as a dc to dc converter that could input ~80V and output ~20 watts at 4 volts and ~10 watts at 24v...
  11. M

    Downhill Project

    My goal for this build is to have similar geometry to my downhill bike (2007 kona stinky), but have the same power as a small dirtbike. I ride downhill bike a lot and it would be awesome to not have to hike back up after each ride! Stuff I have purchased so far: 30AH 88V lipo from Hobbycity...
  12. M

    Placement of Slipper Clutch

    I'm designing a dual motor, single-stage reduction drive for a downhill bike and am wondering if it would be acceptable to place the slipper clutch at the hub. The reason I want to put it at the hub is so I don't have to install two slipper clutches, one on each motor. I know it will require a...
  13. M

    Drill Blanks

    I've been trying for over a month to find a drill rod or something similar that is just under 12mm (around 11.95m) so I can fit the 12mm bearings on it that I got from VXB.com. I've bought three separate 3' lengths of rod and none of them have worked. The last one I got from Fastenal and I...
  14. M

    The Proper Way to Build a Lipo Pack

    I just built my lipo pack and have been having second thoughts as to if I did it the correct way. How durable are these packs? Is it ok to just stack them like legos, or do they need cushioning between them? Here is a pics of one of my packs, notice how the sides of each pack are touching...
  15. M

    electrical rpms, controllers and outrunners

    I got a couple of controllers from lyen recently and they have the 112a chipset. I does anybody here know what electrical rpms these controllers will be capable of? I did a search and came up with nothing. I'm running two hxt 80-100 outrunners at 80V. 80V*130rpm/V = 10,400rpm The motors...
  16. M

    2.3kwh of lipo -- how to make SURE it doesn't explode!

    I bought 40 of the 20c zippy 3000ah 5s batteries and to be honest, I'm kind of scared of them... I have a charger from bmsbattery.com set to a charging voltage of 82V to do my bulk charging: http://www.bmsbattery.com/index.php?main_page=product_info&cPath=5_17&products_id=28 A 24s charger...
  17. M

    Two Controllers, One CA

    I have two of lyen's infineon controllers set up to use the CA-DP. I have one CA, but am not sure if there is a way to read the overall amperage and watt hours used, etc. by both of the controllers at the same time. I know a simple way would be to just read off of one controller and multiply...
  18. M

    New Turnigy 80-100b Dimensions

    I've searched and for the life of me can't find the dimensions for the new motors with the skirt bearings! I have some on backorder and want to order the bearings now so they'll be here when my motors get here. Also, what is the difference between a regular bearing and a skirt bearing? Anyone...
  19. M

    smallest hub motor (non-freewheeling)

    I'm working on a project that requires a motor to apply power forward and backwards. The motor needs to be small (around cute hub motor sized) and cannot freewheel. Direct-drive would be best, but I have not found any that are small enough to fit the bill. Does anyone here know of a motor...
  20. M

    Downhill/Pitbike Hybrid

    Starting a new build (I'm selling my old one to help fund this one), the parts I'm starting off with are: 24" Sun doublewide rims with hadley hubs super crappy and cheap chinese pit bike frame Marzocchi monster T forks I'm in the process of chopping off the unnecessary parts of the frame and...
  21. M

    24s charging voltage

    I'm about to buy a charger from bmsbattery.com, and it's asking to specify the charging voltage. This is going to be for a 24s Zippy lipo pack. Would it be a good idea to charge at 4.2V per cell, giving a 100.8V total voltage? I guess I'm not sure what they mean by charging voltage. Here's...
  22. M

    BMSbattery chargers

    Anybody have any experience with them? I'm looking at the 2000w EP-k Model, here is the link: http://www.bmsbattery.com/index.php?main_page=product_info&cPath=5_17&products_id=31 I know that their inexpensive chargers are not the best quality, but what about more expensive ones...
  23. M

    should cross over to the darkside?

    I'm in the process of planning a downhill/pit-bike hybrid build and have been trying to figure out what batteries to use. I was initially pretty excited about cellman's batteries, but the future availability of those cells looks kind of bleak. Looking around, it seems as though my only option...
  24. M

    Voltage during balancing

    I have a 10 cell prismatic lifepo4 pack that I just put together. The cells are 20ah and the bms is a ping v2. Last night during its first balancing phase, I checked the pack voltage and it was 40V, thats 4V per cell assuming there arent any low ones! Is this normal? I though lifepo4 wasn't...
  25. M

    putting batteries in series

    I'm going to use two battery packs in series and wanted to run my schematic by you guys before I hook it all up, it's actually more of a picture than a schematic, but I hope it will make some sense. When I charge, the controller will be off. I'm pretty sure I won't have to have a diode, as it...
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