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Thread: Issues with a 72V Headway BMS

              
   
   
  1. #11
    Ghost Rider Allen_okc's Avatar
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    its just a rachet driver - serious problems i have now

    the cells in my pack are not balanced anymore, the three 24 volt segments of gauges should ready equally, example 26.3 volt which is the packs normal reading after about 5 miles of riding time - so now it says 25.3 volt first gauge and the other two are reading 26.3 which means something is very wrong...

    i checked to see if i can charge it all back to equality and instead it wont charge at all - the green light on the charger stays green now, the charger thinks the pack is fully charged. so im not sure if the charger is messed up or the BMS or the a cell has gone bad...

    my guess is that the bms could be faulty, especially after hooking it up wrong the first time, which im sure could have damaged it...

    which means no matter what the pack has to come out of the bike again... the only other thing is i didnt hook up the ground lead of the bms to the controller, hoping to just use the bms for balance charging only...

    ive read the threads about other 72V Headway BMS and some of the problems they had which seems to be the same but different than the problem im having...

    the cell logs says that all cells are at 3.28 with a few that are 3.29 - but the first cell log is warning of cell difference...

    any ideals?

    man i can hear Ed's "I Told You So" is coming...

    as i slaps myself upside the head, way...
    The Greatest thing about a EV, is the Song of the Terrain...

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  3. #12
    Ghost Rider Allen_okc's Avatar
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    well the pack lost two cells yesterday - .4 volts...

    i got the cells out before they could do anymore damage...

    im not sure what went wrong, but knowing a BMS history, its my guess that a bms will find weak cells and destroy them...
    The Greatest thing about a EV, is the Song of the Terrain...

  4. #13
    Old EV Racer EVcycle's Avatar
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    Quote Originally Posted by Allen_okc View Post

    Man I can hear Ed's "I Told You So" is coming...

    as I slaps myself upside the head, way...
    Naaaaaaaa.

    I can appreciate your effort. (been there, fried that)

    Now you know why I went with the best technology at the time,(2009), individual chargers.

    They are still going strong today. My solution does not fix your issue of a good, inexpensive onboard charger.

    Unless you can fit these chargers under a tank....
    EV Ed
    Never let being a responsible adult get in the way of passion and curiosity.
    Motenergy.com
    Ev album 2456, 2458, 2457, 2681, 3456, 3630, 5511, 5512

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  6. #14
    Ghost Rider Allen_okc's Avatar
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    No please Ed, i need it, i deserve it

    Anyway i replaced the two dead cells both still reading .4 volts - i have a extra four good strong cells to replace the two - i put everything back together, im just not going to put it back into the bike till after a complete detailed bench test...

    but i checked the two added cells and all others and everything is setting at 3.3 volts each, there is no visible reason as to why the old cells died - but i'll know more by monday...

    im just curious if a bms will find weak cells then destroy them...

    either way i will buy a new one from headway headquarters if i have too - i really need to make my bike capable of a single extension cord for charging in a parking lot with the on board charger...

    its a good thing i didnt try this with the chevy volt battery pack, i would have been extremely upset over this, otherwise i love trying to solve problems...
    The Greatest thing about a EV, is the Song of the Terrain...

  7. #15
    Ghost Rider Allen_okc's Avatar
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    The Greatest thing about a EV, is the Song of the Terrain...

  8. #16
    Seņor Member podolefsky's Avatar
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    Quote Originally Posted by Allen_okc View Post
    im just curious if a bms will find weak cells then destroy them...
    I don't see why it would, unless it was malfunctioning or hooked up wrong.
    - Noah Podolefsky -
    The GSX-E

  9. #17
    Senior Member SplinterOz's Avatar
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    My Social Networking


    Visit SplinterOz's Youtube Channel
    I have some BMS modules from this place... http://minibms.mybigcommerce.com/minibms-4s-cell-board/ but they used to have one board setup with both master and slave setup.... http://rgelectric.wordpress.com/2012/05/13/233/

    This is a nice small analog BMS. It does require a relay to control the charger and an external 12volt power.
    SplinterOz
    From Australia'a Capital
    http://rgelectric.wordpress.com/

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