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

[ACELEXX]

you dont understand what i mean.. it's exacli the oposite of what I said..

you may get more DB of your small woofer but.. it's because your sound box is specaly desing to do that. but by increasing your subwoofer power wont do nothing (in the case that you dont have a oversized amp for your sub**) if your subwoofer is more powerfull.. is just gonna be stronger and gonna stand that power easily.

if you got a 100w amp. to power you 1 000W subwoofer.. you may increse your db by changing the box or the wire or whatever.. but you wont get more power that 100W, you will only optimise that 100w and transform more of that energie in to sound.. but that like transforming the power that the motor consume in to torqe and speed..

mabye i just dont take the right part of the probleme (with the sub). if i take a batch of AA battery and put them together to get 12-14v like in every car.. i wont be able to power my amp. that can take 700A because my smalls battery can only deliver a few mA.. understand..? your battery can't deliver 700A

 

[vanilla ice]

We're with you man.. so its a 35,400 watt kart. And my 800 watt RMS competition amp powering my 5watt stock dash speakers isn't really an 800w sound system. Gotcha!

 

[ACELEXX]

YES YOUR 800 watt RMS competition amp powering YOUR 5watt stock dash speakers GIVE YOU 800W.. YOUR ARE GONNA DESTROY IT BUT FOR A SHORT TIME, IT WILL GIVE YOU 800WATT.

WHAT I SAID IS THAT YOUR STOC RADIO THAT PUSH 5 WATT TO YOUR 500WATT COMPETITION 6¾" SPEEKER WONT GIVE YOU 500WATT.. AGAIN, THAT'S NOT THE BEST EXEMPLE BECAUSE.. EUH.. SORRY, IT'S HARD FOR ME TO EXPLAIN IT..

BATTERY --- CONTROLER --- MOTOR --- MOTION
BATTERY --- AMP --- WOOFER --- SOUND


THE PROBLEME IS BETWEEN THE TWO FIRST STEPS

IF A USE A BUTCH OF AA BATTERY TO POWERUP MY 1000W AMP, THEY NEVER GONNA DELIVER THE POWER THAT MY AMP NEED TO PLAY HIS 1000W OF POWER. i MAY PUT MY SETUP ON MY AMP SO IT CAN DELIVER 1000W.. BUT 1000W ON 12V MEAN 83A. SO IT'S LIKE YOUR KART.. I SET MY AMP SO IT CAN TAKE 83A.. 83A * 12V..=1000W.. OH WOW.. 1000W.. NO.. MY AA BATTERY DELIVER ONLY I DONT KNOW 500mA SO... 0.5A * 12V = 6W.. ON THE 1000W THAT YOUR AMP CAN DELIVER **WITH THE RIGHT SOURCE OF POWER**, IT ONLY DELIVER 6W.

I HOPE YOU UNDERSTAND WHAT I MEAN.. IF NOT I WILL BE FORCED TO EXPLAIN IT IN FRENCH.. HOPING THAT SOMEONE TRANSLATE IT IN A BETTER ENGLISH THAT I DO


OUPS! SORRY FOR CAPLOCK

 

[ACELEXX]

and, by tthe way.. if I'm wrong, what's the adventage of putting 10 battery in parrallele (sorry.. i'm not sure of that word..) if that's not to increase the courent that your powerpack (400 cells) cant deliver. if I'm wrong.. remove 9 of them, you will get the same voltage and let your controler set to 700A



--------------- CQFD

 

[ACELEXX]

lol sorry.. CQFD mean "CE QU'IL FALLAIT DÉMONTRER"

a french expression that mean what has to be prove is now

 

[vanilla ice]

We *are* with you man.. So my sound system reversed-example was a poor one. My 10w cassette deck receiver driving my 800w subwoofer is a better example. Sorry to muddy the argument even more than doc's sound system tangent post already did.. We're with you man, we got it!

"Just because I don't care doesn't mean I don't understand."- Homer

 

[Link]

For some reason, I'm having trouble finding a graph of an A123 M1 cell under load that goes past 30C. However, extrapolating from the 1 I did see (that supposedly dealt with a 2Ah cell, IDKWTF), voltage at 70A for one cell should be around 2.3V.

70A x 10 cells in parallel = 700A
2.3V x 40 cells in series = 92V
700A x 92V = 64,400W in. Not 70kW, but still nothing to scoff at.

IIRC, most motors make maximum power at around 60% efficiency, so about 38kW out at peak, assuming BEMF isn't limiting current by the time it gets there.