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  1. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    This project is dead. The enoid bms (https://www.ennoid.me/) or fox bms (https://foxbms.org/) are good other options.
  2. Teslafly

    HESC V1 150v 600Amp VESC based motor controller

    Does anyone have more information on the c350 and c700? The c350 seems to be a bit optimistic with it's phase amps considering it has 8awg output wires and 2x 12awg input. Looking to power a ME1117. (http://www.motenergy.com/me1117.html) The c350 seems like it may be a good fit, if slightly...
  3. Teslafly

    NEW QS 165 MOTOR

    So the vesc actually supports the mt6816 encoder ic in spi mode. The main problem is you need to tie pin 2 to 5v instead of gnd and pin 1 is chip select (cs) instead of the 5v in abi mode. There is also someone working to add pwm encoder input support to the vesc. But that hasn't gotten too far...
  4. Teslafly

    Folding 27.5+ wheel frame for 12s 1kw ebike

    While I have investigated mid drives, and they definitely have a better torque option, there are a couple of things I don't like: - loss of regen - integrated controller (I eventually want to design / experiment with my own brushless controller) - higher cost - more complex and higher wear. I...
  5. Teslafly

    Folding 27.5+ wheel frame for 12s 1kw ebike

    The time has come to build myself an Ebike. With a monster hill on campus when I'm at school, a 4 mile commute to work during the summer (reasonably flat & bikeable, but leaves you fairly winded), and a slight amount of inspiration coming from the Moar kickstarter, the time has finally come to...
  6. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    All prototypes are currently spoken for. Rev2 may come into existence in 1-2 months. I am currently writing the post detailing this.
  7. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    Nope. They turned out perfectly. I think I used a -.05% swell and got my stencils from oshstencils. $6 per stencil for a project like this isn't bad.
  8. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    Progress update Lots of stuff has happened since the last big update, and if that one was a "design" iteration, then this one is definitely a "test" iteration. This post is probably also longer than strictly needed, but I partially want to document this thing so I can go back and look back at...
  9. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    There are no provisions at the moment for full current battery passthrough. There are two npn power mosfet outputs that could be used to drive a contactor or your own high current mosfet bank though. I made this decision because I figured it was much easier, cheaper, and scalable to use simple...
  10. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    Well, A lot has happened since my last update. I've been working on the BMS almost the entire weekend and have made lots of progress. (aka, boards assembled, code tested with balance resistors and voltage measurements -intermittently?- working) I'll post the actual update tomorrow or tuesday...
  11. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    Huh, well I guess that this system wouldn't be the best for them unless they wanted to spend the extra $ for a 6s board that effectively manages 1 cell. You may be better off knocking off a cell or using a cheap Chinese "BMS" for those lower power setups. Blocks of 6s are the best, but if you...
  12. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    Do you mean 12S system? I am unaware of 13S being a standard, but am aware of 12S, 16S, 20S and 24S being pretty common. Each balance board can handle 4-6 cells, so for 13 cells you would need 3 boards, and because they have a minimum of 4 cells par balancer you would need 5 cells the first...
  13. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    ... Not really. not really at all. All BMS systems are going to have a bit of the same design concepts because they accomplish the same function, but the board you linked to really doesn't have anything to do or contribute to this project. Rather, it is part of the problem it is trying to...
  14. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    UPDATES! REV 1 is ready for prototype manufacture. The Rev 1 Balancer board has had it's silkscreen cleaned up, mounting "holes" added, and BOM completed. All parts are selected and ready to be ordered. The final estimate for parts cost is ~$18, not including solder paste and other...
  15. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    Development wise this project has slowed but not stopped as of late. School has been a bit more work intensive and I haven't had that much time to work on this until this weekend rolled around. I have started writing code and believe I have most of the rudimentary communication pinned down. This...
  16. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    If you look at the ATA6870N reference schematic It has them as well and specifies their value in the datasheet. I believe that the ATA6870N chip has tvs/zener diode protection built in - Hence the 1k resistors on the voltage sense inputs and 10 ohm resistors on the power pins. I will test to see...
  17. Teslafly

    Open source integrated EV Electronics system

    Ok, I created a new thread just for the BMS. Discussion for that branch of this project should head over there: http://endless-sphere.com/forums/viewtopic.php?f=14&t=63863
  18. Teslafly

    [DEAD PROJECT] OSBMS - A scalable, low cost, and full featured BMS

    For the last month or so (and just thinking about it long before that) I have been developing a battery management system based off the ATA6870N-PLPW (http://www.mouser.com/Search/ProductDetail.aspx?R=ATA6870N-PLPWvirtualkey55660000virtualkey556-ATA6870N-PLPW) and an embedded teensy 3.1...
  19. Teslafly

    Open source integrated EV Electronics system

    Oh, so you're gonna need three master boards as well. ok. I'm less concerned now, although I would push you to only use it on one ev as it is in no way guaranteed reliability. also, so I know what some others would like, could you provide me with the specifics of your setup/s and what you would...
  20. Teslafly

    Open source integrated EV Electronics system

    10 boards? = 60 cells = 222v nominal? What sort of battery pack are you running? And are you sure the mere 420ma balancing current will be enough for what sounds like a huge pack? I only have the capability to test up to 40 cells 5ah. Once balancing and fault control is working are you sure you...
  21. Teslafly

    Open source integrated EV Electronics system

    You didn't loose me with the sarcasm, I am just horrible at responding to it. I'm told I have a very dry, "english" sense of humor. As for the 4gb winbuilder, yeah, it's big. It's either download a huge file, or download a ~700 meg file and all it's dependencies and wait a couple of hours for...
  22. Teslafly

    Open source integrated EV Electronics system

    Oh, yes. I am running the latest version compiled from source. If you want to compile it yourself, you can either run kicad winbuilder: https://launchpad.net/kicad-winbuilder or build it another way: http://www.kicad-pcb.org/display/DEV/Build+KiCad That or you can download a precompiled...
  23. Teslafly

    Open source integrated EV Electronics system

    There isn't a pic of the schematic in the github folder as of now. However, there is the raw kicad project files, so if you want to see the schematics you will have to open them with that. I will be adding more pictures and such later on when I update the documentation after the master board is...
  24. Teslafly

    Open source integrated EV Electronics system

    Ok, the first board is complete. Between classes, lots of studying, and a hard drive crash I finally got it completed. You can view the results here: https://github.com/Teslafly/OpenBMS I will create it's own es thread once I finish the main board as well. (est 5-10 days) (edit, using...
  25. Teslafly

    Open source integrated EV Electronics system

    I am aware of these problems, and have worked past it on several occasions (bit banging 8 pins for pwm has to be fast) and I would not consider using them for anything but dev boards either. In any real product It is best to put the controller directly on the pcb and wire it how you want for...
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