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FAQ: "BEC" Battery Eliminator Circuit. School me

Discussion in 'Trail Truck Electronics' started by 907SCX10, Jul 7, 2012.

  1. 907SCX10

    907SCX10 New Member

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    I hear a lot about a bec here and there.
    School me. What's its purpose form and function ?
     
  2. Got Raptor

    Got Raptor Studio Forums Elite
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    Bec is a Battery Elimator Circuit. Layman's terms it is a regulator. Using one will aid when using high torque servos,winches,lights, pretty much anything that requires power from the battery. The unit takes over the job of the ESC with voltage regulation. On a stock set up when you use a high power servo and throttle the motor, the servo would suffer and would loose power. By using a bec it will keep the voltage balanced so your electronics don't loose/suffer power loss. Hope that essay helps out lol. Castle creations is the most popular bec to get and the voltage can be adjusted to what you need.

    Here link to them

    http://www.castlecreations.com/products/ccbec.html

    Rcnightmare did nice job with explaining and setting one up as well. (No offense guys and medic but they did it plain and simple for "dummies" and was easiest for me personally, to follow.

    https://www.youtube.com/watch?v=zdUhLH7BS4E&feature=youtube_gdata_player

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  3. 907SCX10

    907SCX10 New Member

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    School's out , thanks raptor , very informative.
    I'll watch the Ytube link.
     
  4. Got Raptor

    Got Raptor Studio Forums Elite
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    My pleasure. Any other questions, never hesitate. We all here to help.

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  5. 00whynot

    00whynot Moderator
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    lol the first thing i noticed is how all the leading companies had parts in the video. lol altho he gave traxxas no credit for the motor. :p
     
  6. 907SCX10

    907SCX10 New Member

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    So from what I gather my stock RTR has no use for one till I get my nvs and winch and higher tq servo..
     
  7. Got Raptor

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    Exactly. Your stock AE-2 esc has a bec built in. I believe all escs do. I didn't get one till I bought a winch and was running it through my receiver for power. Led's draw little voltage so a bec may still not be necessary for the nvs system.

    A winch being powered from receiver and high torque servos it is a must.

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  8. 907SCX10

    907SCX10 New Member

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    Sweet ty again raptor
     
  9. 00whynot

    00whynot Moderator
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    well. not exactly. with a bec you can safely run a 3s lipo on your stock setup. which makes it a tone more fun.
     
  10. Got Raptor

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    Thanks whynot, I totally forgot about that and yet i just started doing it... haha

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  11. 907SCX10

    907SCX10 New Member

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    Elaborate more please :D lol, I run a 8000mah 2s. But would love to know about a 3s on a ae-2
     
  12. Got Raptor

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    Without a bec a 3s lipo would fry the ae-2. Once a bec is installed and set you can then run a 3s without issues. I am currently uploading a test I did with my truck once I tossed in a 3s. I'll post soon as it done.

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  13. Got Raptor

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  14. 907SCX10

    907SCX10 New Member

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    Looks like I'll be getting a bec. Haha I've got the basic install figured out.
    How do you set the bec up to run a 3s with out baking the ESC?
    Paydays Tuesday , I'll trade out the beadlocks and tires i wanted for a bec :)
     
  15. Got Raptor

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    As far as I know there is nothing you need to "set up" for it work with 3s. You would need the castle creations programming card/hook up to adjust the voltage. Most servos run at 6 volts and the default voltage on the bec is set at 5.1 so it would need to be adjusted.

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  16. 00whynot

    00whynot Moderator
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    actually you don't need to do anything. i believe the ae-2 will auto detect the number of cells you have. it is after all a castle esc.
     
  17. 907SCX10

    907SCX10 New Member

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    So , in effect the bec limits the ESC power to "2s" and the rest goes souly to the servo?
    I guess I'm confused as to how the bec is stopping the ESC from over heating due to the extra volts , if this isn't the case the. Why can't we just run 3s w/out a bec.
    Sorry if I'm confusing anyone. I just like to know exactly how stuff works.
    Blame it on the a.d.d
     
  18. Got Raptor

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    Borrowed this from dimension engineering they explain pretty well.

    http://www.dimensionengineering.com/info/bec

    "I have a 3A BEC in my speed control - is that enough?"

    "It is very common for speed controls to have BECs rated at 2 or 3A. However, what the manufacturers do not tell you is that this rating is only true for an input voltage of 6V. The BEC on your speed control is what engineers call a 'linear voltage regulator'. It works by burning up excess voltage and turning it into heat. The higher the input voltage, the more heat gets produced. If there is too much heat, then the BEC will either fry, or shut down! The result of this is that in real world situations, if you are running a 3S lithium battery pack, your ESC's BEC will only be able to provide about 0.5A before it overheats. "

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  19. 00whynot

    00whynot Moderator
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    the bec supply's everything with power except the esc. [thats why you remove the red wire] the esc still gets its 11.1v from the battery. but the built in bec is bypassed so it doesn't create all that extra heat. you may actually find you run cooler even on 3s.
    ive had so many esc's blow out that i could have most likely revived if id have known about bec's then. i too am new to them but i fully understand what they do now. ive got 3 esc's that i know of that work again if i was to buy a bec for them. i tested them :)

    PS: I think this thread should be a sticky
     
    #19 00whynot, Jul 8, 2012
    Last edited: Jul 8, 2012
  20. Got Raptor

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    PS: I think this thread should be a sticky[/QUOTE]

    Second that haha
     

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