Originally Posted by perfect1
My flying buddy connected a device (from Bantam) between my battery and ESC and found that the amp draw is near to 40A during a full throttle test. When using a clamp tester (set to DC measurement), the reading is only 20A. I cannot explain the big difference in the two readings. Is there an AC component in the battery lead when the motor is running? Or is there any other factors. Someone ever tell me to multiply the clamp meter's reading by 1.5 or 2 in order to get the real amp draw. He did not tell me the reason behind this.
Yup perfect1, 40 amps sounds about right. Not sure why clamp-on amp meter is not working. Do you have it clamped around just one battery wire or both? Seems like if it is around both, they might cancel each other out.
Also, there would be an AC component, but it would be high frequency, maybe 8poles x 5000 rpms /60 sec/min. I get about 700 Hz. That is a total guess, just ignore me