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Help powering 2s-3s Esc's via 4s Lipo.

Discussion in 'Drone Electronics' started by Pauli 336, Oct 17, 2016.

  1. Pauli 336

    Pauli 336 Member

    20
    1
    1
    Sep 27, 2016
    N Ireland
    Posted by Pauli 336, Oct 17, 2016 #1
    Hi,

    I bought some backup Esc's and Motors for my Hex, just to have spares. However, on delivery, I have notices they are for 2s-3s battery. This is my mistake as I should have read the detail in the advert.
    I can't use these on my Hex now unfortunately, but I have enough parts to enable me to make a second Quadcopter and will use these in it.
    I have 3 4s Lipos already, and don't really want to have to buy 3S lipos as well for this new build. Is it possible to use a 12v UBEC to step down the voltage from a 4s Lipo to drive the ESC's and Motors? If so, what amp rating would be needed for the UBEC? If this works I can use the 3 4s Lipos on both builds as needed..

    Thanks
     
    Tags:
  2. jamesb72

    jamesb72 Member

    73
    17
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    Feb 5, 2016
    Somerset, UK
    Posted by jamesb72, Oct 17, 2016 #2
    Short answer is no. No ubec would handle the current. Quite a few 3s esc are being used on 4s with good airflow for cooling so you could Google to check for others using them. Failing that sell them on and buy 4s esc.

    Sent from my SM-G903F using Tapatalk
     
  3. Pauli 336

    Pauli 336 Member

    20
    1
    1
    Sep 27, 2016
    N Ireland
    Posted by Pauli 336, Oct 17, 2016 #3
    Thanks, I thought that may be the case as a quick google did not bring up any UBEC with a high enough Amp rating. Ill hold on to them and buy a few £S batteries.
     
  4. moonpie57108

    moonpie57108 Member

    136
    14
    1
    May 21, 2016
    South Dakota
    Posted by moonpie57108, Oct 19, 2016 #4
    If you like to push the limit, Google the specific esc to see if anyone tried them with 4s.

    Otherwise, 3s isn't terrible, majority of mine are just that. To drop from a Hex to a small quad you would probably need smaller batteries anyway. You can build a pretty quick 3s 150-220mm racer/acro that would make you feel better about 3s. You'll just need higher kv motors than your 4s rig.
     
  5. OldGazer

    OldGazer Member

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    Jan 28, 2015
    North Chesterfield Virginia, 23237
    Posted by OldGazer, Jul 7, 2017 #5
    Good engineering practice says never exceed the manufacturer specifications, and just because others got lucky does not guarantee you will too...
     
  6. JCLs

    JCLs Member

    63
    1
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    Feb 13, 2016
    Houston
    Posted by JCLs, Jul 7, 2017 #6
    That is smart thing to do.


    Sent from my iPhone using Tapatalk
     
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