need reference of electric vehicle expert/hobbyist

[knieft]

Aloha all,

I bought a 4 year old electric motorcycle (looks like a big moped) for 10 cents on the dollar, knowing that it will need new lithium batteries for top performance. It is known for not having a battery management system (BMS) and I would like to install one when replacing the batteries. I could muddle though it with my limited understanding, but much prefer to work with and pay someone who knows what they're doing replacing these 21 Lithium Ion cells and installing a BMS.

I am canvasing the motorcycle shops but haven't found a tech who really knows about this stuff. Anybody know of someone who is into something like this?

Right now I can do Pahoa round trips, but could do Hilo with new batteries.

This is the model, FWIW:

http://www.x-tremescooters.com/electric_...000li.html

Cheers,
Kirt

[Wao nahele kane]

The systems are fairly straight forward and simple, if you can't find anyone to do it for you, taking the short time to learn about it and doing it yourself would be far better in the long run. Hint: buying Li-ion packs and building your own bank will save you big $.

E ho'a'o no i pau kuhihewa.

[Wao nahele kane]

If you build your own bank you can achieve longer ranges.


E ho'a'o no i pau kuhihewa.

[Bullwinkle]

here are a few charge controller references or are you looking to manage discharge as well?

http://discovercircuits.com/B/batt-chrg3.htm

we have one of those electric boats - found that after the speed control died it was cheaper to bolt on an eco friendly honda 4 stroke .... found that the bits and pieces were pretty pricey

[Wao nahele kane]

Here's a link that incorporates a BMS and discusses bank builds too -
http://lithiumate.elithion.com/php/plan.php


E ho'a'o no i pau kuhihewa.

[Bullwinkle]

see "dreamliner" - grin

good read as to open and closed loop systems

http://www.mpoweruk.com/motorcontrols.htm

[knieft]

Thanks for the links and advice Bullwinkle and Woa!

It would be a matter of buying the individual cells and BMS and wiring them. According to the visforvoltage forum posts it is a multi-hour teardown to get at all the cells making it prohibitive to pay someone. I plan to do the tear down and simply check the connections and hopefully finding a bad cell or three to improve the performance.

I'm pretty sure I can do the tear down. Getting it back together...? Oh well, you may as well do one thing as another.

Thanks again, gentleman.

Cheers,
Kirt