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  #21  
Old 05-16-2012, 12:34 PM
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Default Re: Formula Hybrid

Controller and motor aren't the problem, the battery is. A 125KW battery won't come cheap and at 72V, it's got to have some really badass batteries in there to supply over 1700A (more because the batteries sag).
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  #22  
Old 05-16-2012, 12:35 PM
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Default Re: Formula Hybrid

I'm really sorry if i'm making you feel that you're doing homework for me ............. But though i may be knowing the things , it will be taken as a verification when you also suggest the same thing and they will be pretty much practical as you've worked on these kinds of stuff................The calculations even a small kid can do but we shouldn't be facing the practical problems later ........... If we face later then that time i can't come and ask in the forum. so i'm clearing everything out including very small stupid thing.......
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  #23  
Old 05-16-2012, 12:37 PM
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Default Re: Formula Hybrid

What motors, controllers and batteries have you researched?
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  #24  
Old 05-16-2012, 12:44 PM
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Default Re: Formula Hybrid

The motor will be Yasa 750 with curtis 1238 controller and a LiFePO4 pack
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  #25  
Old 05-16-2012, 12:54 PM
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Default Re: Formula Hybrid

The curtis controller is an Induction Motor controller with no support for BLDC motors. The Yasa 750 is a BLDC motor.

The 1238 series controllers are limited to 130VDC and 650A, but at 650A you'll have sag, so still, only expect about 80kw peak.

What lifepo4 pack? what batteries?
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Old 05-16-2012, 01:02 PM
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Default Re: Formula Hybrid

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Originally Posted by frodus View Post
The curtis controller is an Induction Motor controller with no support for BLDC motors. The Yasa 750 is a BLDC motor.

The 1238 series controllers are limited to 130VDC and 650A, but at 650A you'll have sag, so still, only expect about 80kw peak.

What lifepo4 pack? what batteries?
LiFePO4 is the short form of lithium Iron Phosphate battery pack......... It is a lithium polymer battery pack used in some of the EVs.......
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  #27  
Old 05-16-2012, 01:04 PM
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Default Re: Formula Hybrid

I know very well what lifepo4 means.....

I'm asking about WHAT BRAND and MODEL of cells have you looked at. Not all are created equal. There's 100's of manufacturers of lifepo4.
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  #28  
Old 05-16-2012, 01:08 PM
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Default Re: Formula Hybrid

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Originally Posted by frodus View Post
I know very well what lifepo4 means.....

I'm asking about WHAT BRAND and MODEL of cells have you looked at. Not all are created equal. There's 100's of manufacturers of lifepo4.
Okay Presmatic cells or pouch cells may be............... hey are pouch cells available for such a voltage requirement though they have higher energy density???
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  #29  
Old 05-16-2012, 01:20 PM
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Default Re: Formula Hybrid

You still haven't answered.

What brands of cells have you looked at? Who makes them?



I'm not doing the work for you, come on, try harder. You said you'd compare what we tell you, against what you have done. I'm asking, what have you done?
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  #30  
Old 05-16-2012, 03:34 PM
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Default Re: Formula Hybrid

Ok, I am thinking he needs a place to start. Most people start here:

www.evalbum.com

You can see lots of examples and can search by battery brand, type, controller, etc. When you find cars that are similar in performance to what you want, take note of the components used, research their cost and capabilities.

Then you will know a little something.

There are many paths to what you seek. Do you merely want to meet the target? Or do you want to build something cool? You mention 72v pack. I think you must have forgot a zero and meant 720v, yes?

In America we call this humor..
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