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Old 11-30-2008, 10:00 AM   #784 (permalink)
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Blackfly - '98 Geo Metro
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Originally Posted by elanmel View Post
Add me to the list of folks who have read all your posts on this project
Congratulations. Your prize is ... learning from our mistakes!

I would like to get up to 55 MPH at least so I can pop onto the freeway for a few miles when I need to. I'm only looking for 20-30 miles range, though, so I think 72 volts sounds right.
I'm with Ben: I think you'd be hard pressed to get to 55 mph in "normal" traffic with a 72v car, unless you're going downhill, with the Santa Ana winds at your back. I'd consider 90v a minimum for occasional highway duty. And you'd measure acceleration to 55 mph with an hourglass.

In an earlier message you briefly discussed overvolting your motor, but haven't done so yet.
Nope. But the Motor Expert Husted said we could probably safely overvolt the motor in the car to 120v without problems.

Overvolting DC motors is common. The issues you have to deal with are: heat dissipation and brush timing.

Good luck with your project!
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