Motors 
Friday, October 20, 2006, 05:30 PM
I almost picked up a 6.7" Advanced DC motor off ebay. I didn't bid too aggressively because I wasn't sure I really wanted it.

I think there are two choices for motor.
The briggs and stratton Etek motor - chinese made, usually about $500.

I'm leaning towards a Perm 132. It's the same technology as the Etek, but german made and bigger and better. It costs a bit more, but it's the heart of the machine.

Perm 132:
at 48v: 15.1 peak hp, 86% efficency.
at 72v: 34.2 peak HP, 88.6% efficiency.

That's enough to temp me into a higher voltage system...

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nice battery comparison page 
Friday, October 20, 2006, 12:17 PM
http://www.geocities.com/CapeCanaveral/lab/8679/battery.html
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Spiral Cell batteries 
Friday, October 20, 2006, 12:13 PM
Exide Orbital XCD
12v 50AH, 41 lbs, 10.17 x 7.00 x 8.12H, 2.5 milliohms, Peukerts <1.05
600Kw each

Optima Yellow Top:
model D34/78, 12v 55AH, 43 lbs, 10 x 6.8 x 7.8H.
660Kw

Optima 31 12v 75 AH, 60 lbs, 12-13/16 x 6-1/2 x 9-3/8H. Both are 2.5 milliohms, Peukerts 1.05,
900Kw

So....
4 x Exide Orbitals:
124lbs, 2.4kwH (48v x 50Ah)
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Prius battery details 
Friday, October 20, 2006, 11:52 AM
The prius pack I'm looking at is made up of 38 modules, each consisting of 6 1.2v cells. Right.
Here's the skinny. Each module weighs 1.04Kg.
38 modules x 1.04Kg = 39.52Kg.
39.52Kg = 87.13lbs

So, 88lbs, flexible configuration, 273.6 volts, 6.5Ah.
That's 1.788Kwh

The downside: They get hot during charging and require BMS.
The upside: I'm building a motorcycle. Plenty of airflow avaliable.
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prius battery... maybe 
Thursday, October 19, 2006, 07:13 PM
I'm still considering the prius battery.
Apparently they get pretty warm as they charge - so warm that toyota put alot of effort into air cooling and such. I'm leaning towards using a B600 nicad. They're pretty cheap surplus and have a good rep. The problem? Each cell is 1.2v, and I'd want 48v at least. I've found them for $10 each online. $400 in surplus nicads... or $300 for prius batteries. I'm leaning towards the prius cells unless I find a good deal on the nicads.
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