I agree with going with as high of voltage as you can, at some point speed controllers start costing more for higher voltage, but 144 to 300v is becoming more and more common, but up to 144v can be bought or made cheaper.
It's important to remember when building your car that you want it to last 100,000 miles, that is, if it's worth building for a 65 mile per day range.
Even if you have a 65 mile range, it's worth asking your work place about being allowed to plug in, if you can offer to take the least appealing parking space, 40 seconds of extra walking per day is good for you and it could save you a ton of money or at the very least give you a full charge on your way home.
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