Quote:
Originally Posted by yurtle
Electrically, either connection is identical. I'd say, which ever arrangement results in a more solid connection for the 500 amp terminals, use that. If both arrangements are similar, meaning stud length of solenoid is adequate, and/or controller terminal, then I'd route the cables to allow the most flexibility, since the motor "follows" the road, while controller and solenoid follow the frame, over bumps.
I prefer only one cable per solenoid stud, just 'cause. 
EDIT: If your solenoid is the same as mine, don't forget the studs are larger. |
Ironically, when the controller's output duty-cycle is less than 100%, the B+ on controller to A2 on motor cable carries more amps than the stubby cable from the solenoid's controller side stud to the B+ terminal on controller, so the most efficient configuration is landing both cables on the controller's B+ terminal. That way the higher amps have a slightly shorter path (less resistance) to travel.
If you look at your data logs, motor amps exceed battery amps when throttle is less than 100% and motor amps equal battery amps when throttle is at 100%.
This is due to feeding the motor with pulsed DC when at <100% duty-cycle. When the pulse ends, the magnetic field collapses and generates a current in the windings that is the same polarity as the pulse was. There is a "Freewheel" diode, or something similar, in the controller between M- and B+ that completes the current loop.
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If you have thick cables in good condition, the difference probably is not noticeable.