Unless youāre trying to seriously off road or race, start with 2wd. Itās simple to add another 2 motors and a controller later on and will get you rolling sooner.
I blast up hills with a 2wd 10s5p samsung 30q battery. I also off road a good amount. If I ever get hardcore into off road or racing, maybe Iād consider it. Drains your battery much faster running 4 motors.
Example of 2wd crushing through a field
ok thanks man that takes about 4000 off my build
Is it possible to apply 12S (50 Volts) to the motor immediately from 0 RPM or voltage increases with increasing RPM only?
Iām gonna split this into two possible permutations:
Q1: Is it physically possible to to apply 12S (50 Volts) to the motor immediately from 0 RPM?
A1: Yes, but it will cause a ridiculous initial current draw due to the low resistance of the windings, possibly damaging the motor and/or the controller and/or the battery or BMS.
Q2: Can a Vesc do the above?
A2: I donāt know, but I donāt think youād get THAT much more performance, considering the risk to your hardware. Also, with the ridiculous current, youād saturate your stator (Once saturated, you get very little to no benefit to increased amperage).
I incorrectly formulated the question, I donāt gonna make changes, just wanna understand how voltage affects torque from 0 mph. But as I understand from your answer, the voltage grows gradually until the maximum speed is reached, right? I bring the question to whether the torque will change at low revs when using different 8S 10S or 12S batteries.
In other words, whether the torque/acceleration will change at low RPM when using different batteries 6S / 12S / 18S with the same current?
Voltage does not directly affect torque. Torque in an electric motor is caused by the interaction of magnetic fields, at least one of which is from an electromagnet. The strength of the interaction (and thus torque) is proportional to the strength of the fields, and the strength of an electromagnet is a function of the number of turns of wire, times the number of amps.
TLDR, more amps=more torque, until you saturate the steel in the stator. Voltage is only there to push the electrons around, generating the current.
The Vesc is usually in current-limiting mode, where it adjusts its output voltage to maintain the output current at or below the maximum set value. When a motor is stopped, the only thing stopping it from drawing infinite current is its own internal resistance (measured in miliohms) and the similarly low internal resistances of the VESC, BMS, wiring, and battery. Thus at low speed if you measure the voltage and current output of the VESC, if itās set at 50 motor amps and you floor it, it will shove 50 amps through the motor, but only like 8 volts. This is because any higher voltage would cause the motor to pass more than 50 amps.
This changes at higher speeds, due to a phenomenon called back-EMF, or generated voltage. As the motor spins, it behaves as a generator, producing a voltage that opposes the input. At some point the back-EMF and the input voltage match each other, and this is the point where the motor will not spin any faster - its maximum speed. This is why esk8 and other vehicles powered by BLDC motors have a āhard limitā on top speed - itās not about available power like it is in a car, rather itās the point where the motor just will not spin faster because that would cause it to generate electricity rather than consume it.
An esk8 with a 6s battery, and an esk8 with a 12s battery (and all other hardware and settings identical) will accelerate the same from a dead stop. The 12s will continue accelerating for longer, and reach a higher top speed, but the 6s will launch just as hard.
This is the same thing that your battery current setting affects - not how hard you accelerate initally, but for how long that acceleration persists before tailing off.
Think of motor current as torque, and battery current as maximum horsepower. Raising your maximum horsepower wonāt necessarily increase your torque at launch, but youāll still win the race because you can keep accelerating longer.
It is very useful to know, thank you!
Glad to help. Itās a common misconception and not a super intuitive answer, so I try to go into extra detail when explaining it. 
The thing I canāt figure out in right now is resistance.
We have Ohmās law: current = voltage / resistance
If VESC can handle 100A, then motor with winding resistance of 0.05 ohm can start working at 5 volts (it gives us 500W power from 0 mph). Then does the resistance start to grow slowly, and the voltage increases accordingly up to max RPM?
However it means the higher motor windings resistance, the more torque. This sounds logical, considering that motors with lower KV have more windings and resistance, and give more torque, but what if its high resistance is not related to the KV but to low motor quality?
I feel like Iāve written complete nonsense 
The resistance of the motor doesnāt increase, but the back-EMF (generated voltage) opposes the battery voltage more and more as speed increases, which makes the motor behave as if its resistance is changing.
The resistance is not directly related to torque or KV, merely a side effect. As I mentioned above, the strength of the magnetic field is proportional to the current times the number of turns. A lower KV motor (more torque) has more turns, and thus produces stronger magnetic fields per amp. But because wire has resistance, more turns means longer wire, which has a higher resistance.
When configuring FOC settings for my vescs, is it important that the motors have their belts on? When the FOC runs itās test functions to detect resistance, inductance, etcā¦ is it important to have the drag of the wheel and wheel pulley felt by the vesc tool?
Hi donāt no if Iām posting in the right place but can anyone tell me what all the extra plugs are on this esc? Im new zealand based and Iāve bought this deck from a local supplierā¦ it looks to be a clone of the halo board version 1ā¦ if that helps??
Empty ones are you talking about?
No itās not. Actually better to have them off, that way the extra resistance to spinning doesnāt have a chance to skew the readings.
Yea m8e ā¦ all the ones plugged in are the motors and on button and so onā¦ well i havenāt unplugged anythingā¦ just wondering what all the extras are for?
Some versions of pre built boards have different models but use the same basic electronics. Could be take offs for lights/logging modules anything really. Without knowing the particular board its very hard to tell.
Chur churā¦ yea it fully looks like a halo skateboard but its branded with monty skateboardsā¦ www.montyboards.com is there web address ā¦ long story short Iād ask the supplier but we already butted headsā¦ and honestly I donāt think he would have a clue.
I found a picture of a halo skateboard inside online too ā¦ n the esc looks a lot different to this oneā¦
What are you trying to do? Connect something?