My friend's 70000 watt electric go-kart 400x A123 !!

Doctorbass

Doctorbass

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:shock:

My e-club friend, from Montreal built this lastest version of his electric go kart!

using nothing less than:

-a ZILLA 1K controller!!!! :twisted:
-400 M1 A123 cells
and an 7" hydraulic pump DC motor

just like 8 times the power i have on my ebike :lol:

Just isane!!!

[youtube]bERjkSTYOdU[/youtube]

Doc
 
Great video!

Good to see some more hi performance electric vehicles. As fun as my e bike is it hasn't satisfied that little kid inside of my that wants to go fast and smell burning rubber.My Honda projects us to for fill this but i have promised myself not to go back to ice as tempting as it is at times.

I have access to a lot of second-hand industrial motors. I just wish it was as cheep to go fast with electric as is is with ICE. Give it time I guess.

it would be interesting to get some of these electric vehicles on a rolling road and see what numbers they put out to the wheels torque and kw. When you say 70,000w is that just potential wattage draw? 70kw at the wheels is a lot of power for a little 8" tyre.

Impressive none the less.



Kurt.
 
Kurt said:
Great video!

Good to see some more hi performance electric vehicles. As fun as my e bike is it hasn't satisfied that little kid inside of my that wants to go fast and smell burning rubber.My Honda projects us to for fill this but i have promised myself not to go back to ice as tempting as it is at times.

I have access to a lot of second-hand industrial motors. I just wish it was as cheep to go fast with electric as is is with ICE. Give it time I guess.

it would be interesting to get some of these electric vehicles on a rolling road and see what numbers they put out to the wheels torque and kw. When you say 70,000w is that just potential wattage draw? 70kw at the wheels is a lot of power for a little 8" tyre.

Impressive none the less.



Kurt.
Click to expand...

His controller is set to 700A ( out of 1000A max) and the measured voltage drop is down to 100V. 100V x 700A = 70000W

Doc
 
I'm all excited....now I have to finish my kart, not that powerfull, only 40 000Watt , 240 A123 Cell, 30S8P, Kelly 500Amp controller, but lighter than Alex's goKart....it will be a nice race!

Robin
 
Killer Kart!
can you please post a tutorial or a walk thru of your battery set-up and BMS.
How do you charge them?
would really appreciate it. I cant get mine right.
or any one else with same a123 batt system setup?
videos or pics please.
thanks
 
I think he may either have very non-optimized gearing, or perhaps he is not quite measuring power correctly, because his kart seems to accelerate much slower than a typical 250cc shifter kart, which is only 35-40kw. Maybe it's just the tires limiting his ability to apply power?

I would love to see how he does at the kart track.
 
liveforphysics said:
I think he may either have very non-optimized gearing, or perhaps he is not quite measuring power correctly, because his kart seems to accelerate much slower than a typical 250cc shifter kart, which is only 35-40kw. Maybe it's just the tires limiting his ability to apply power?

I would love to see how he does at the kart track.
Click to expand...


First time at the 1/4 mile it did 13.01 @ 92.5MPH not bad ;) with a 7.7 1/8 mile
 
If his kart and driver are 400lbs, and he has 70kw of power, his quarter mile should be about 9.4 and trap at 144mph.

Given the time you've told us, that would indicate an average power applied of 25.9kw to a 400lbs machine to go down the track with that time.

A 250cc shifter kart with much less than 70kw can run mid-high 9s.

Did his kart turn out to be super heavy? Or is 70kw only his instant current when starting from a stop?
 
liveforphysics said:
Did his kart turn out to be super heavy? Or is 70kw only his instant current when starting from a stop?
Click to expand...

I think you got it. As it picks up speed, the current (and therefore the input power) will drop off.

He also seemed to be having trouble keeping the tires stuck to the road. :twisted:
 
fechter said:
liveforphysics said:
Did his kart turn out to be super heavy? Or is 70kw only his instant current when starting from a stop?
Click to expand...

I think you got it. As it picks up speed, the current (and therefore the input power) will drop off.

He also seemed to be having trouble keeping the tires stuck to the road. :twisted:
Click to expand...

It's true the motor current will decrease as RPM increases, but yet the power equation is linear with angular velocity (aka RPM), so it depends on how much torque / multiple of motor current decreases with RPM. In quite a few geared applications, if the input current is being limited over a large RPM range, the output power curve is rather flat above a certain speed and gets pretty close to the input power so it might stay close to 70 kW input for a great section of its range of speeds (The output power may only be something like 55-65 kW). But the specifics of that depends on his setup's specifics, which we don't have.
 
I think we can make the conclusion that he has geared too short.

The following calc's are for a 400lbs driver/vehicle weight.

17kw of acceleration power over the duration of the 1/4mile is all that is needed to achieve his 92mph final speed.

25.9kw of acceleration power over the duration of the 1/4mile is all that is needed to achieve his 13sec ET.

That's a pretty big difference. From my estimation, he had completely stopped acceleration by the 1/8th mile.


Solution? Fit a sprocket with about 5-6 more teeth on that motor, throw another master link in the chain, and get back out to the track! :) That will help with launch traction as well.
 
liveforphysics said:
I think we can make the conclusion that he has geared too short.
From my estimation, he had completely stopped acceleration by the 1/8th mile.


Solution? Fit a sprocket with about 5-6 more teeth on that motor, throw another master link in the chain, and get back out to the track! :) That will help with launch traction as well.
Click to expand...


Yes...This is the next step....and yes the top speed is reached before or at the 1/8 of a mile!

I have a crazy project with the owner of that gokart for a Formula 1 style electric (cromoly chassis tubing, aluminium panel, Warp 11'' , 800 A123 Cell + Zilla at 264Volt and 1000 Amp) it's only a dream...with most of the parts that we allready own... in 2010 it won't be a dream anymore :) (we will kick ass in 1/4 mile, 1/8 mile, and specially on the race track!)

Robin
 
Robin, sorry to go off topic here but did you know your motor is alive and well?

The Moby loves it!

I should have some video tomorrow.

So - thanks for selling it to Paul so I could buy it! :mrgreen:
 
recumpence said:
Luke,

(A little off topic) 12kw, 280 pound all-up weight. What kind of accelleration?

Matt
Click to expand...


If you apply 12kw continously to vehicle with 280lbs total weight, you will have an ET of 15.4seconds, and should trap 87mph.
 
His controller is set to 700A ( out of 1000A max) and the measured voltage drop is down to 100V. 100V x 700A = 70000W
Click to expand...

english version at the end**
le vidéo est en français alors je me suis dit que je pouvais bien me permettre de poster en francais :p
désolé de te contredire mais je suis pas certain que ça sois si simple. moi comment que je voit ça c'est que chacune de tes 10 batterie (40 cells en série) peut te donner selon les specs 30A a 2,95v, donc 10 * 30A ça nous donne 300A. Pour la tension.. 40 * 2,95 = 118v (toi tu avais 100 a la lecture ça peu vouloir dire que tu tirais plus de courant encore mais tu peut pas avoir plus de puissance annyway alors j'ai prix les specs..) donc 118v * 300A = 35 400w

et ça c coté électrique parce que t'a tout un tas de perte dans tes fils, l'efficacité de ton moteur, et j'en passe..
c pas parce que ton controleur alloue 700A que tes batterie vont le fournir**
si je suis dans le champ, vous me le dirai mais moi c'est comme ça que je voit ça


sorry, i'm a french studen and it's easyer for me to explain my point in french so for those who speek french, they will get more détails. so.. i dont think your calculs are goods. I've looked in spec of the A123 cells and what i learn is that they deliver 30A max at 2,95v. that's mean that your putting your volt meter and see 3,3v and whene you "ask" :?: 30amps from your battery, the voltage drop to 2,95v.. so 30amps per battery (of 40 cell) mean 10battery * 30 amp. = 300A not 700. the setup on your controller does not mean that yours batterys can deliver that much power. if I continue with the specs, we said 2,95volt per cell * 40 cells = 118v (close to your 100v, you may get more courent but less tension, that's mean the same power (in Watts)) So, 118v * 300A = 35 400W

I may be wrong but, but i realy dont think that your battery can deliver 700A at 100v
 
it mean nothing it's like if I pu a 3000Watt RMS subwoofer in my trunk with a 50 watt amp. i could say that i have 3000watt of bass but it wont be true.. only 50watt
 
ACELEXX said:
it mean nothing it's like if I pu a 3000Watt RMS subwoofer in my trunk with a 50 watt amp. i could say that i have 3000watt of bass but it wont be true.. only 50watt
Click to expand...


Usually when you talk about Bass intensity you shold use the dB.. not the watt!

Watt is the electrical power that goes into your subs.. dB is the sound pressure level they can reach!

ex: in my integra i had a 120Wrms amp that pushed one 5 1/4 woofer! in a special designed SPL box i made and that reached 142dB at 53Hz with the mic on the dash ... with 142Watts only.. some will only do 130dB with 1000W amp and 2 x 12"..

best score overall i acheived was 157.2dB with 2 x cheap 10" woofer and a XXX6500D 6000W rms amplifier at 57Hz on the dash.. :mrgreen:

Doc
 
OK, now we are onto SPL.

I was exactly at your score of 157.2. But, mine was done with 8,000 watts through four 15s. That was playing actual music, though. :wink:

Matt
 
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