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Thread: Max amps

  1. #1
    Join Date
    Dec 2019
    Location
    ns
    Posts
    19

    Default Max amps

    If a motor is rated at max amp of 200amps how is it measured at what load and will a 240a esc be ok for that?

  2. #2
    Join Date
    Mar 2011
    Location
    BC
    Posts
    7,328

    Default

    A 240 amp ESC should be lots. The amps which the motor WILL draw depends on variables mostly regarding the load which is placed upon it. Size of prop, weight of boat, how easily boat gets on plane. Always start with a smallish prop for the setup. Lots of ESC’s get blown up in the first 30 seconds by running the correct prop but on a boat which is not ‘setup’ correctly yet.

    The max amp rating should be at the given rated voltage.

    Shawn

  3. #3
    Join Date
    Apr 2007
    Location
    AZ
    Posts
    7,628

    Default

    The maximum amperage stated by the maker is the maximum amps at which the motor should be run. You can load the motor to draw many more amps as Shawn mentions, but you run the risk of motor and ESC damage.

    How do you measure the amps? Without a logging ESC you can’t measure it directly, but you can measure the motor and ESC temperatures after a run. It is really the temperature which limits the motor/ESC, not the amps. Start by running for one minute (use a timer) then bring the boat in and measure the temps as quickly as possible. If the temps are under about 120*F then take it out for another minute at a time until the temps reach 140*. This will be close to your maximum run time with that setup. Get in the habit of measuring the temps after each run - in the summer you will probably need to prop down, or run for a shorter time.


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