Simple power useage measure

Discussion in 'Power Electronics' started by johnredearth, Sep 13, 2016.

  1. johnredearth

    Thread Starter New Member

    Sep 13, 2016
    3
    0
    Hi
    I want to compare power useage in a model boat after replacing a motor (brushed) with a brushless one. (I use arduino in my boats).

    The battery is an old 6V lead acid, and the current is less than 20 amp. To make the trial solid I want to fit a 'circuit, or simple measuring system to my boat and sail it around a course at a set speed and then measure power useage. Then replace the motor etc and do the same to see what the difference is. I will then post a video about this for the model boating community.

    What is the best way of doing this?

    John
     
  2. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,282
    1,235
    Since it is 2 different motors how do you know you will be going the same speed?
     
  3. crutschow

    Expert

    Mar 14, 2008
    12,993
    3,229
    This may work for you.
     
  4. johnredearth

    Thread Starter New Member

    Sep 13, 2016
    3
    0
    I will do a few circuits and will manage the speed manually. I don't think there will be another way to do that
     
  5. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,282
    1,235
    I don't know how big it is, but how about this:
    Tie the boat to a pier with a gauge that measures the pull (scale?)
    Then you could just measure the motor current.
     
  6. ronv

    AAC Fanatic!

    Nov 12, 2008
    3,282
    1,235
    My idea is no good as the motor will have different speed torque curves.:(
    Carl's idea should work.
     
  7. johnredearth

    Thread Starter New Member

    Sep 13, 2016
    3
    0
    Ok thanks. I found a much cheaper one in Aus. All I need and a quick answer thanks!
     
  8. paul Wright

    New Member

    Sep 13, 2016
    2
    0
     
  9. paul Wright

    New Member

    Sep 13, 2016
    2
    0
    Hi,new here, how do I post a thread to ask a question
     
  10. crutschow

    Expert

    Mar 14, 2008
    12,993
    3,229
    At the top right of the appropriate forum page where is says Post New Thread.
     
    paul Wright likes this.
Loading...