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Why the low top speed? "All electric parts except the batteries are from China" so I suspect that his "300 amp" speed controller can't really handle that many amps like most speed controllers from China, then you add in 1,000 pounds of batteries and that speed controller is most likely the weak link in the system.
If you look at what $4,000 will buy you for an EV on Ebay right now, you will find better options.
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