major wrote:Look into Alltrax, Curtis, Sevcon, Navitas. Kelly looks good but actually suck. Used golf cart controllers are an option though most are 36 or 48 Volt.
yeah... the usual suspects. lol.
The problem I have with them is they cost more than the whole kart... I'm not trying to build a car. And Kelly... they're just downright misleading with their specs.
I already know the cheapie unregulated controller I have coming out performs their largest mini DC controller stuff.
Another reason I want a programmable controller is voltage range. I dont want it to over discharge, as kids will keep going until it cuts out... but I want to run as high as 66v.
Hillhater wrote:Why do you want 100/300 amps on a kid kart ?
That yk43 probably wont push much more than 30amps at best, so you need not be concerned for the kids, and if you want to restrict it further you could always fit a throttle limiter.
Running 100+A at 24 volts will need a spendy controller and some serious wiring upgrades.
why? because I dont want it to suck.
This is a former rental track kart. Its the "kids" cart to them because of the frame size. I still fit in it at 6ft, but just barely. Its all steel, overbuilt with real race kart brakes, slicks, steering, etc. Unlike a true race kart thats built to be light, this is overbuilt to be beefy. I could put a motorcycle engine on it without reinforcing...lol
This isnt for just young kids, kids of all ages will drive it. This is whats going to convince the next generation that electric vehicles dont have to suck. Think teens that are motorsports fans... Think grown adults that fit. I even have the silly idea of running it at a few local SCCA autocross events.
How do I get 100/300 amps?
Right now, using 4 goped lead acid batteries. they're in a 2p2s config making 24v and capable of just over 100a.
I tested the cart with a contactor and switch. from a dead stop I pull that 100a and its just meh. It doesnt totally suck, but I also am no where near the traction limit or wow factor... its just that these batterys cant do more.
A kart like this should burnout if I floor it from a dead stop, and it has slicks so its going to take some power first. lol. Remember how everyone brags about the "instant torque" of electric motors.. but then most builds make less power than their gas equivalents. I want these kids to go "wow, my kart cant do that" not "oh, thats neat" or "my kart is faster". At the very least I want to launch out of the autocross start.
I plan on running Leaf or Volt cells, whatever comes up first locally. In either case, pulling 300a bursts will not be an issue.
This is at low voltage, so we're only talking 2400 watts at the moment (100a) and 7200 peak watts as a goal(300a). The non-kiddy karts are 8200watts already (11hp)
Another reason it has to be an amp limiting controller, is that I will eventually raise the voltage to increase top speed, and I want to keep peak wattage reasonable. I wont be pulling 300a at 66v, as thats almost 20kw. lol.
as to wiring upgrades.. I snagged plenty of wire from the other karts, so I have a couple hundred feed of very flexible fine stranded wire about 1" dia with the jacket, that was intended for commercial kart use on 11hp karts. wiring, contactors, and controls wont be an issue, I hit the jackpot!
I plan to make a build thread soon, I just havent had good weather yet. Im on the east coast and storms keep sitting just off shore, throwing rain every evening.
heres a pic for a better idea.. I already took off the "ring" bumper, stickers and hit it with the pressure washer a bit to clean the rubber off the plastics.