Of course I cant compare a golf cart to a commercial EV. Golf carts have great range power and system simplicity and they work!
Just saying scale up the golf cart design.
making a 600 -700 volt battery is not hard. Use smaller AH cells but far more of them and you still get the same battery capacity but at much higher voltage.
How much power does a full sized EV of the design you are working on take? Battery volts, amp hours, motor amps at 600 - 700 volts.
I had a full sized electric car for many years. It was built back in the early 1980's and it could easily go 75 MPH on near 30 year old design technology.
It also had a realistic driving range of 30 - 40 miles at highway speeds (55 MPH) too. It had by todays standards a low efficiency controller and no regenerative braking.
With a better control system it would have been able to regenerative brake and if the Lead acid Golf cart batteries (16 6 volt 220Ah) were changed out for modern high energy batteries that have known energy density's better than 10x the golf cart batteries when comparing volume to usable power ratios.
I know dam well it could be driven at todays high way speeds for 250 -300 miles between charges.
I sold it to my mom last year and she absolutely loves it! Operating cost is about 1 tenth that of her regular car on a cost per mile comparison.
EV technology is not new is just overpriced because of lack of proper research and design ideas. Simple works and it always will!
I just used the golf carts as an example of EV technology that has proven itself practical, reliable, and reasonably priced. All I was saying was take that technology and multiply the voltage capacities by 10 or so and the amp capacity by ten or so.
With power electronics thats a no brainier for any one that works with it.
I have seen and worked around modern VFD unit and huge industrial stepper motor drive systems that are the size of a home computer case and easily control 200 hp electric motors and already have regenerative feed back capacity.
They typically have 600 volt internal Bus voltages too!