Battery cut-off when discharging

Discussion in 'The Projects Forum' started by nickbell, Mar 19, 2014.

  1. nickbell

    Thread Starter New Member

    Mar 19, 2014
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    First let me say I have little or no electronics background.

    I am hoping to build a battery discharger, and I want this unt to cut off at 3.3v. (a little background here, I race radio controlled cars using 3.7v lipo batteries)

    I somewhat understand and can read these circuits from my engineering background, however I have no earthly idea what I need to change to achieve this cutoff.

    I'll be starting at 3.8 volts with approx 30amp load

    thanks for the help

    Nick
     
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    You should start your own thread, not hijack someone else's.
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. magnet18

    Senior Member

    Dec 22, 2010
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    you just want it to shut down entirely? or do something like send out a warning?
    Racing RC cars, is weight a factor?
    the simplest route (in my opinion), is get an arduino or other uC(microcontroller), measure the voltage, and shut it down with a relay (or use a transistor somewhere in the control circuitry to inhibit the thing)

    just my opinion, I'm a fan of arduinos though
     
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Is this discharger an in-car or out-of-car thing? Do you have a power supply other than the Lipo available for the discharger?
     
  6. inwo

    Well-Known Member

    Nov 7, 2013
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  7. magnet18

    Senior Member

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  8. inwo

    Well-Known Member

    Nov 7, 2013
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    I didn't understand this to be an "on board" device.:confused:

    "I am hoping to build a battery discharger,"

    Seems more like a battery tester.
     
  9. magnet18

    Senior Member

    Dec 22, 2010
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    i took it as an onboard device that shuts the car down when the batteries hit a certain point, we should probably wait for op input rather than running away with this though
     
  10. burger2227

    Member

    Feb 3, 2014
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    Lithium batteries can be ruined if discharged too far. I'd assume he wanted something to avoid that.

    He's probably wondering where his thread went...
     
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