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Do I need an external BEC?

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  • #1

    Do I need an external BEC?

    I have a T-Rex 450 Pro DFC. The standard ESC BEC is rated to 3A continuous, 5A burst.

    I have just ordered MKS DS95 servos. I'm also running a 3GX, Spektrum AR8000 + satellite and TM1000 telemetry.

    Do you think getting a dedicated BEC is a good idea? If so, which would you recommend and how would I wire it in?

    Thanks
    Tags: None
  • #2
    I would recommend going for an external bec. There are plenty of brown out threads if you go looking. Mine is wired in by soldering to the ESC connectors which connect to the lipo. Mine was only a cheap BEC, but they don't seem to stock them anymore.
    Cheers,
    Simon
    --------------------------------------------
    Trex 700N & E
    Futaba 18mz and some planks !!

    x 2

    Comment

    • #3
      Would it be beneficial to run both the internal BEC and external BEC in parallel (assuming same voltage)? Seeing as I already have the internal, would it give additional redundancy?

      Or can I run the servos on the external, and keep the internal for the receiver?

      Comment

      • #4
        Originally posted by rudi View Post
        Would it be beneficial to run both the internal BEC and external BEC in parallel (assuming same voltage)? Seeing as I already have the internal, would it give additional redundancy?

        Or can I run the servos on the external, and keep the internal for the receiver?
        Bad idea to run both BEC's in parallel. It will almost certainly end badly.
        TREX 700E DFC SK540

        TREX 550E AR7200BX

        Logo 400SE SK540

        Check Out My Youtube Channel http://www.youtube.com/user/pocoyo2212?feature=mhee

        Comment

        • #5
          Originally posted by ghost2212 View Post
          Bad idea to run both BEC's in parallel. It will almost certainly end badly.
          That will be business as usual then; most of my flights end badly

          Comment

          • #6
            Originally posted by rudi View Post
            That will be business as usual then; most of my flights end badly
            Just disable the ESC's BEC by disconnecting and isolating the red wire on the lead that goes into the receiver.
            TREX 700E DFC SK540

            TREX 550E AR7200BX

            Logo 400SE SK540

            Check Out My Youtube Channel http://www.youtube.com/user/pocoyo2212?feature=mhee

            Comment

            • #7
              remove the positive wire out of the esc bec and cover with some heat shrink and run an external bec is the best way
              Last edited by Red3; 27-10-2012, 02:48 PM. Reason: my bad corrected
              Trex700E sold
              Trex550e fbl cc pro bec ice100
              TRex600nsp ds620s spartan ds760 bls251 sold
              Dragons450 gy401 s9257
              Mcpx
              JRDSX9MK2
              coolice Power Supply


              https://www.flickr.com/photos/133062485@N05/

              Comment

              • #8
                Originally posted by ghost2212 View Post
                Just disable the ESC's BEC by disconnecting and isolating the red wire on the lead that goes into the receiver.
                doh lol you beat me to it lol
                Last edited by Red3; 27-10-2012, 03:07 PM.
                Trex700E sold
                Trex550e fbl cc pro bec ice100
                TRex600nsp ds620s spartan ds760 bls251 sold
                Dragons450 gy401 s9257
                Mcpx
                JRDSX9MK2
                coolice Power Supply


                https://www.flickr.com/photos/133062485@N05/

                Comment

                • #9
                  Originally posted by Red3 View Post
                  remove the negative wire out of the esc bec and cover with some heat shrink and run an external bec is the best way
                  Don't remove the negative wire, If the red wire is still connected there will still be issues as there's still a common ground between all the components. Just The Red wire is all you need to remove.
                  TREX 700E DFC SK540

                  TREX 550E AR7200BX

                  Logo 400SE SK540

                  Check Out My Youtube Channel http://www.youtube.com/user/pocoyo2212?feature=mhee

                  Comment

                  • #10
                    I've just seen this wiring diagram:
                    http://www.castlecreations.com/suppo..._bec_setup.pdf

                    It shows how to use multiple BECs in parallel.

                    Unless anybody can think of a good reason not to, I think my plan will be to use the internal BEC to power to receiver, 3GX and telemetry, and the external BEC to power the servos.

                    Comment

                    • #11
                      you are right sorry my bad i have corrected
                      Trex700E sold
                      Trex550e fbl cc pro bec ice100
                      TRex600nsp ds620s spartan ds760 bls251 sold
                      Dragons450 gy401 s9257
                      Mcpx
                      JRDSX9MK2
                      coolice Power Supply


                      https://www.flickr.com/photos/133062485@N05/

                      Comment

                      • #12
                        Originally posted by rudi View Post
                        I've just seen this wiring diagram:
                        http://www.castlecreations.com/suppo..._bec_setup.pdf

                        It shows how to use multiple BECs in parallel.

                        Unless anybody can think of a good reason not to, I think my plan will be to use the internal BEC to power to receiver, 3GX and telemetry, and the external BEC to power the servos.
                        Surely the extra complexity involved to rig it up makes it pointless? Also the receiver 3GX and telemetry draw such negligible power levels compared to the servos makes it even more not worth it.
                        TREX 700E DFC SK540

                        TREX 550E AR7200BX

                        Logo 400SE SK540

                        Check Out My Youtube Channel http://www.youtube.com/user/pocoyo2212?feature=mhee

                        Comment

                        • #13
                          This is a 450 remember, so I'm at the stage where I pretty much need to run a custom wiring loom with custom crimped plugs to fit it all in and keep things neat. I also want to run nav lights and camera. So doing the split power supply at the same time won't be too much of a problem.

                          Also, I like doing stuff like this - it is part of the hobby. Not so much when it goes up in smoke (although I daresay my suppliers like that bit).

                          Comment

                          • #14
                            just for info run a cc bec pro on my 550 this is designed to run with twin outputs. i know you are running a 450 but pilots with much more knowledge than me have always told me to disable an internal bec when running an external one so i would think you would do this in all setups?
                            Trex700E sold
                            Trex550e fbl cc pro bec ice100
                            TRex600nsp ds620s spartan ds760 bls251 sold
                            Dragons450 gy401 s9257
                            Mcpx
                            JRDSX9MK2
                            coolice Power Supply


                            https://www.flickr.com/photos/133062485@N05/

                            Comment

                            • #15
                              Originally posted by Red3 View Post
                              just for info run a cc bec pro on my 550 this is designed to run with twin outputs. i know you are running a 450 but pilots with much more knowledge than me have always told me to disable an internal bec when running an external one so i would think you would do this in all setups?
                              Thanks. I'm looking at that but I don't think it will fit on my 450. I'd need to mount it at the back. I'm working out the pros and cons of that before I hit Order.

                              Comment

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