[Duncan]

Hi Sunking

The resistance of a DC series motor is very low - as in 1/100th of an ohm (WAG) - so it only takes 10v to get 1000 amps

Anything that you use to provide that current will have it's own resistance - so a 12v car battery will probably deliver about 600 amps

You controller will control that right from the start and will do its PWM magic to feed your motor with it's 10v - by adjusting the PWM and thence effective voltage to get that current

The "stall current" is simply dependent on the voltage - and can be well above the Maximum safe current

As the revs rise the back EMF comes into play

Max power is where the controller is at 100% - battery voltage x set current
I think I hit that at about 60 kph
Then as the revs rise the current has to go down

 

[Duncan]

Hi Sunking

You can always do what I do - I have a controller set to 1200 amps

But I have three switches on the dash
Switch One - drops me to about 500 amps at full throttle
Switches Two and Three have smaller drops

So I can select different power modes
100% for the Track
40% for road use
20% for grass autocross

I have a zero to 5K Ohm throttle - so all I have is some resistors in parallel with switches

A Hall effect throttle could use something similar

I suggest you "overdo" your controller and add some switches