[bobgratonii]

Hi everybody, this is my first thread on this forum. I have read a large bunch of thread here and took a couple of notes and links that you have shared. It is very interesting how much people care about the Oil depepdancy and are ready to invest in ways to eliminate this dependancy.

I am a student in Montreal (province of Québec in canada) and i am about to finish my diploma and have a real job bla bla bla... and more time to spend! As i will work and have no more ... kind of project (current one is success of studies) i am building plans to make my Own EV! I also make some Lan Parties and do some Web developping as hobies (www.pwnfestlan.com) so i will make a complete website of my futur creation.



This first thread is about a question i have looking for and didn't find any answer. ''The'' Question if after the description of my project.

For now, my plans and shema i hope to sucess doing a
2003 Mazda protege 5 EV consisting of :
- 45 x TS 200ah LiFePO4 3.2v in series (if i can find them...)
- BEQ1-LiFePO4 battery management, protecting of overcharge
- EPS200-24 charger from Elite Solution
- BMS-50 also from Elite Solution to keep an Eye on everything
- Kelly controler (Zilla out of stock make me huh)
- Using a Wrap 9 Motor coupled to the stock MT (my daddy is a machinist, will help!)
- RPM sensor using Melexis 90217 Hall-Effect Sensor
- Vaccum pump for the breaking system, will remove ABS system.
- Custom Electric Air Heater to avoid using water heater and a pump (too much electricity spend for nothing)
- Volt/Amp gauges
- Dont know which, but a pack of capacitators before the Kelly controler

And my next step, and my question, is to plan on how i will add theses :
- Stock alternator (eventualy rebuilt), coupled to a A/C electric Clutch on the 2nd Shaft to use braking Regen. Clutch sensor will be put on the brake pedal
- Solar Panel on the roof (2x 20 watt canadiantire solar panel, enough to cover my entire roof)

As a alternator shoot out 12v - 14.4V, and my battery pack being 144v, how would i be able to recharge the pack? Using an UPS to convert it to 144v? Could it be possible to mod an Alternator to let it output that much volt (and that way considerably slow down the motor a lot more)?

On a second way, the use of solar panel (i considered it because it is only 100$ a panel, cool to have for the price) generate a variable amount of Watt (+/-20 watt each). To be efficient, should i use them of ''constantly'' recharge de battery pack while driving? (and how) or should i put them on parallel with the pack before the capacitator to reduce ( i know very a little) the stress of the battery pack?


I know it is a lot of interrogation, i would consider any option assuming that my budget is going to be 25-30k in the next two years. I want to make a cool EV with potential that will make move compagnies that claim to be unable to do this.

Thank you
Philippe

PS : I am really impress by all projects that have actually been made. This is what pushes me to do my own car

 

[sailfish11]

bobgratonii, welcome to the forum!

If you haven't already, look at the alternator and perpetual motion sticky. It should answer your questions.

 

[bobgratonii]

Thanks for the welcome,

but it is not for perpetual moving, i think about a regen while braking mode. But thanks for the link it contains helpfull informations.

 

[reddwarf2956]

This first thread is about a question i have looking for and didn't find any answer. ''The'' Question if after the description of my project.

For now, my plans and shema i hope to sucess doing a
2003 Mazda protege 5 EV consisting of :
- 45 x TS 200ah LiFePO4 3.2v in series (if i can find them...)
- BEQ1-LiFePO4 battery management, protecting of overcharge
- EPS200-24 charger from Elite Solution
- BMS-50 also from Elite Solution to keep an Eye on everything
- Kelly controler (Zilla out of stock make me huh)
- Using a Wrap 9 Motor coupled to the stock MT (my daddy is a machinist, will help!)
- RPM sensor using Melexis 90217 Hall-Effect Sensor
- Vaccum pump for the breaking system, will remove ABS system.
- Custom Electric Air Heater to avoid using water heater and a pump (too much electricity spend for nothing)
- Volt/Amp gauges
- Dont know which, but a pack of capacitators before the Kelly controler

And my next step, and my question, is to plan on how i will add theses :
- Stock alternator (eventualy rebuilt), coupled to a A/C electric Clutch on the 2nd Shaft to use braking Regen. Clutch sensor will be put on the brake pedal
- Solar Panel on the roof (2x 20 watt canadiantire solar panel, enough to cover my entire roof)

As a alternator shoot out 12v - 14.4V, and my battery pack being 144v, how would i be able to recharge the pack? Using an UPS to convert it to 144v? Could it be possible to mod an Alternator to let it output that much volt (and that way considerably slow down the motor a lot more)?

On a second way, the use of solar panel (i considered it because it is only 100$ a panel, cool to have for the price) generate a variable amount of Watt (+/-20 watt each). To be efficient, should i use them of ''constantly'' recharge de battery pack while driving? (and how) or should i put them on parallel with the pack before the capacitator to reduce ( i know very a little) the stress of the battery pack?


Thank you
Philippe

PS : I am really impress by all projects that have actually been made. This is what pushes me to do my own car

The ideas for the car sounds great. As for the alternator and solar ideas, realize that the switch from small voltage to high voltage means high amps will go to low amps. This in turn will mean the time needed to recharge will go longer. We are talking weeks to charge the pack with solar, or single digit regen on a DC motor car which means more weight added.

I like the idea of using the solar charger to power a small fan during the summer to cool the car when it is in the (where I'm at, Texas) summer sun. I doubt 20 W heater will work in Canada.

Don't get me wrong, they both can be done. But, is the benifit worth it?

JN

 

[slurryguy]

I have no experience with alternator for regen brakes, and I have my doubts about whether the added complexity and weight will pay for themselves with increased range from battery recharging.

However... the idea you propose has been very recently attempted and partially documented on YouTube in a Chevy S10 Pickup Truck EV Conversion.

http://www.youtube.com/watch?v=zhGEiusexJ4

http://www.youtube.com/watch?v=pZ77La0MS4g

http://www.youtube.com/watch?v=IWCO5P24zHE


The builder also describes his efforts in more detail on his website:
http://www.northrim.net/wyanders/ev/

Scroll down his index on the left side. Page 20 describes his Regenerative braking system.


I'm not endorsing his technique as practical. In fact, I have my doubts about where it is worth the expense and effort. I'm also not willing to dismiss it out of hand completely either. I'm willing to be open minded and see what his results are.

The point of my post is that the idea has been attempted, and I would certainly be interested in seeing objective data about what this system does for this builder's range.

It would also be great to see what his range would be if his truck were lighter by removing the entire alternator regen system and compare his range with the lighter vehicle vs the range he got with the heavier regen equiped truck. (I suspect he's unwilling to remove all of his work just for my personal entertainment and education, though.)

I have no idea if this information will be helpful to you, but there it is.

 

[bobgratonii]

Considering the fact of the weight i have to assume that it seams discutable. Maybe, with the time i will have, i could do a ''ready to take out'' system. If i can do that, i will and put the numbers. In fact i would love an AC system for regen, but for the price and complexity i doubt to make it throught. In fact i haven't seen a good AC motor for this purpose and no controler at all.