I picked up a recording DC amp meter last year.  Here are some readings I took at about 4 samples a second.
Inline image

Keep in mint the locked rotor amps will be very fast and hard to catch.  This part of the curve shows that it is back to running amps in about 2 seconds.
Inline image


I might guess that the armatures have .07 ohms combined in parallel.  Ignoring the voltage drop in the battery amps = 36V+/.07 ohm= 514+ amps.

I am interested in trying new battery but have been worried about this very issue if the BMS would be a problem.  What is the size of the battery and rating of the BMS?

Rob


On Tuesday, July 12, 2022, 04:02:29 PM EDT, james murray <jmurray1232@rochester.rr.com> wrote:


I recently bought very expensive lithium battery for my mid mount new idea tractor.  The tractor works beautifully, however the bms shuts off the instant I try to start the mower deck.  Does anyone know what kind of current the three Dr k motor require to start and then run?

Thanks.
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