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  #1  
Old 02-23-2009, 12:34 PM
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Default BMW bi-moto EV project

After months of research I finally started converting my car. The ICE components are all out of the car.

Old photos with the ICE inside:










Science I've started the project i didn't made new photos. I will shoot some this week and post them here.

My goal is to make a very, very powerful EV. I will use the two UQM systems. One in the front and one in the back of the car. The motors will be connected directly to the diffs.

EDIT: UQM systems haven't been used in this car.




(the components shown in this picture are symbolic)

Kokam batterys will be used for the battery pack(s). I'm not sure if I should make two battery packs for each system or one big pack. I will order the batterys this week. They will be delivered in three months.

Suggestions and questions are welcome

Last edited by CroDriver; 08-17-2010 at 05:31 AM.
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  #2  
Old 02-23-2009, 02:48 PM
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Default Re: BMW bi-moto EV project

Awesome ride! I've always wanted to build up a nice, older BMW.

What size battery pack are you going with? Any info yet on charger, controllers, etc.?
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Old 02-23-2009, 03:11 PM
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Default Re: BMW bi-moto EV project

Quote:
Originally Posted by Greenflight View Post
Awesome ride! I've always wanted to build up a nice, older BMW.

What size battery pack are you going with? Any info yet on charger, controllers, etc.?
I



I used the specifications claimed by Kokham but I have to leave some space between the cells because they expand when getting hot

Last edited by CroDriver; 08-17-2010 at 05:32 AM.
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Old 02-24-2009, 07:46 AM
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Default Re: BMW bi-moto EV project

Quote:
Originally Posted by CroDriver View Post
But I'm not sure what would be the optimal input voltage for the controller.




Operation or nominal input?
Hi Cro,

Use a nominal battery voltage about 350. That way you have headroom for regeneration and bottom room for sag under heavy load.

What are you? Secretary of the Treasury over there?

Regards,

major
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  #5  
Old 02-24-2009, 07:58 AM
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Default Re: BMW bi-moto EV project

Thanks for the reply

Quote:
Originally Posted by major View Post

What are you? Secretary of the Treasury over there?

Regards,

major
What should that mean?

You think that people in Croatia can't have the money for such a project?

Last edited by CroDriver; 08-17-2010 at 05:32 AM.
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  #6  
Old 02-24-2009, 08:21 AM
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Default Re: BMW bi-moto EV project

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Originally Posted by CroDriver View Post
Thanks for the reply

What should that mean?

You think that people in Croatia can't have the money for such a project?

No insult intended to you or Croatia. Just that your component selection is quite pricey. I'd ask the same of anyone, no matter where they live. For the cost of the motors and battery, you could buy a Tesla Roadster. You have a very ambitious project.

Good luck with it.

major (just that stupid American)
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Old 02-24-2009, 08:22 AM
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Default Re: BMW bi-moto EV project

Nah, he's just referencing the fact that the Secretary of Treasury here in the US probably couldn't afford it.

I second the 350v recommendation. Tough call on single vs. dual packs... For some reason my gut is saying dual packs, but my logical brain is saying single... Let us know what you come up with!
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Old 02-24-2009, 01:19 PM
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Default Re: BMW bi-moto EV project

Wow, awesome project!

Dual battery packs might be easier to keep cool (from the perspective you'd have more surface area per kg of battery).
Quote:
Originally Posted by Greenflight View Post
Nah, he's just referencing the fact that the Secretary of Treasury here in the US probably couldn't afford it.

I second the 350v recommendation. Tough call on single vs. dual packs... For some reason my gut is saying dual packs, but my logical brain is saying single... Let us know what you come up with!
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  #9  
Old 02-24-2009, 03:12 PM
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Default Re: BMW bi-moto EV project

Quote:
Originally Posted by major View Post
No insult intended to you or Croatia. Just that your component selection is quite pricey. I'd ask the same of anyone, no matter where they live. For the cost of the motors and battery, you could buy a Tesla Roadster. You have a very ambitious project.

Good luck with it.

major (just that stupid American)
Yes, it is pretty expensive but it should be one of the fastest EVs on the planet. May be even the fastest car with an AC motor as far as I know (?) Isn't that worth the money? What else could I buy for this money?! (I don't like the Tesla)



Btw. I don't belive that American are stupid people.

Quote:
Originally Posted by Greenflight View Post
Nah, he's just referencing the fact that the Secretary of Treasury here in the US probably couldn't afford it.

I second the 350v recommendation. Tough call on single vs. dual packs... For some reason my gut is saying dual packs, but my logical brain is saying single... Let us know what you come up with!
I will update this thread every time I have made an significant progress

Last edited by CroDriver; 08-17-2010 at 05:34 AM.
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  #10  
Old 02-24-2009, 07:19 PM
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Default Re: BMW bi-moto EV project

dual battery packs is the only logical way to do for the fact that if a controller decides to go on you and short big time the chance of taking out the battery is real at least this way you may still get home on one battery and one motor, are you planning lithiums? are they of the flammable type? Lipos can be touchy but I am sure your aware of all that stuff. great project please do post often and lots of pictures please.

Brian
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