So, with my arduino and canbus setup, I can talk to my Kelly KBL brushless controller via CAN. from this, I can get the battery side voltage, motor side current, and motor side voltage (the motor side values come as triplets -- one for each of the 3 phase wires).
Is it possible to calculate the battery side current given this info?
I want to be able to calculate things like watt-hours and watt-hour/mile, but I feel like that info is better done from the battery side. I could always get a current sensor, but was wondering if I could do it without an external sensor.