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I would argue further the case for higher voltages by saying that more batteries of less AH capacity won't cost much different from fewer of a larger capacity and will weigh about the same for the same total energy storage (comparing like for like).
Also it's difficult to say for sure whether the component cost is higher for high voltage vs high current without looking at specific devices.
I will agree that industrial motors are far from ideal for the application, but they are certainly good value for money, and easy to get hold of.
What I have been looking for is a suitable low cost controller to allow the use of high voltages, this does not exist as yet.
EV conversion will never become mainsteam untill it can create cars with decent performance and range cheaply. I think high voltages are the answer.
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