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Old 08-07-2010, 12:53 AM   #11 (permalink)
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You can go far enough with that. Nice work.

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Old 08-07-2010, 10:12 AM   #12 (permalink)
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Quote:
Originally Posted by Nevyn View Post
...

so yeah, we'll call it 15 miles range. I did all the math right, yes?
Yeah, for the most part. I would change your DOD to 50% though. As you get closer to 100%, your voltage drop while accelerating will get you closer and closer to 10.5V/battery. If you drop below that you risk ruining the battery. Therefor, as you get closer to 100% DOD you have less and less power available for acceleration (pull more amps, more voltage drop). Plus, there is a fairly large drop off in usable cycles in lead acid batteries after 50% DOD from the charts I've seen. Not saying you can't take it to 80%, but I wouldn't count on it on a regular basis.
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Old 08-07-2010, 11:03 AM   #13 (permalink)
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So, I posted out to Freecycle in my area looking for treadmills. Got a hit! brought it home, opened it up, and found this:



Paul, Ben, and crew - is it worth anything, as far as go-kart size is concerned?


PERMANENT MAGNET DC MOTOR
Rotation: CW
Enclosure: Open
External Fan
90VDC, 1 HP SCR Controller 6 MPH
115VDC, 1.25 HP PWM Controller 8 MPH
That should work nicely for a hybrid bicycle. Ignore the MPH numbers since it appears to be originally geared for some piece of heavy machinery and you'll want to gear it for a top speed of about 20-30MPH for a hybrid bicycle, more if you want something to race with.

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