AC/DC

The next big design decision is AC or DC...

With AC you can do regenerative braking, which means you can recapture some of the energy that would normally be lost during braking, extending the range.

Once again cost enters into the equation, DC systems are a couple thousand dollars cheaper than AC. The range benefit I'd get from AC isn't worth the $4 or $5 THOUSAND dollars extra I'd have to pay for the system.