Thank you both.
The full question is this;
I am 60kg, my board is a mtb, will be used as such going up steep hills off road.
2wd
12s6p 40t
Unity.
Imagine i max settings to the most reasonable it can go.
should i choose a
no point of having the extra weight of the 6380 is if i wonât even use the limits of the 6374.
the vesc does a voltage change depending on the speed of the motor (lowering the voltage but increasing the amps) between the battery and the motor⌠so you can safely set the motor max to 150a per motor, and the battery max to 80a per motor without exceeding the battery limit per motor.
unfortunately on a standard vesc 6, hidden in the firmware is a 120a motor current limit, so even if you enter a 150a motor current limit in the settings, this value will be lowered to 120a motor current limit without much indication this has happened.
straight from the vesc-project.com forum:
if you set the battery limit less than the motor limit, youâll lose some throttle range at the higher speeds because sustaining 120a at those speeds requires more than 80a battery amps.
for that reason i recommend not exceeding 80a motor limit per motor and 80a battery limit per motor.
that said, 80a per motor will likely give a large amount of torque at full throttle, so you might want to try something lower like 50a bat and 50a motor at first, and if thatâs not enough torque for you, try increasing the settings while keeping them equal.
and remember, the battery limit setting is per motor
& the motor current limit setting basically determines how much torque you have at full throttle assuming the battery current limit setting allows that much power
Itâs a MTB, you already have a 12S6P of fucking 40T. Weight doesnât seem like the biggest concern⌠Get the 6380. Higher quality, longer lifespan. I believe higher efficiency as well.
Hey I know some electrical things! I think I only fried one Arduino Mega and cooked an alligator clip off a wire getting this test lift rig put together:
well then damn me
i @ ed the wrong person lol
@whaddys we are in the same boat 
Sorry @wafflejock!!!
I take the oputunity to ask another question though haha
i have 2 builds, 1 mtb, 1 street/at build both with gear drives
which vesc would you use for the mtb
cheers!
While I agree with @glyphiks and @professor_shartsis in principle, they seem to have overlooked the fact that you have a 50A vesc4.12. That is your limiting factor, not the motor or battery. With that controller, I wouldnât set the battery current any higher than 40-50, and wouldnât set the motor current higher than 60-75 at most. That vesc just isnât built for any more power - they were designed for cheapness, not thermal performance. No heatsink, and no practical way to add one.
trueâ the hardware limits file in the firmware of a 4.12 vesc has lower battery and motor limits than a vesc 6â likely 50a or 60a bat per vesc and 120a motor per vesc, but it wonât be able to sustain these limits continuously as heat build up will likely lead to thermal throttling if those current limits are sustained
Touche 
what would we do without you 
How does that power switch on the COMM port of the VESC 6 MK III work? Which cables do I have to use and where do they connect to?
@PixelatedPolyeurthan If you do have special current limits, you can use this one
instead which is CC/CV instead of just CV like the other one I linked above. But this one doesnât have mounting holes 
Aside from no way to mount it besides wrapping it in foam and cramming it in there, this one is very very good.
CC/CV = Continuous Current, then Continuous Voltage as load lowers (just like a lithium charger)
CV = Continuous Voltage
Lead acid 12v batteries also have 4 cells in them already(maybe 5 I donât remember).
Six. 2v/cell.
The â12Vâ LiFePO4 batteries are 4S. Which makes them actually 14.6V.
The 12V Pb ones are 6S as @MysticalDork noted
3.2v nominal, 3.6v full charge.
please double check my math for TBDD motor Kv calculation
ERPM: 40334
Pole Pair: 14
Volts: 46.8
Duty: 94.9%
(40334/(28 x 46.8 x .949)) = 64.86 Kv
are you in bldc? its inappropriate to test kv in foc.
foc
10char
