Modified 24v solar wing to 48v brushless

[voided]

Not much has been done for modified parts. Fairly simple if someone without much experience todo. This is my first electric kart build and will be raced with my team.

The goal was to make a budget kart from start to finish without exceeding $500 on the kart.

I picked up the running and driving Serengeti 24v solar wing gokart for $120 off of offer up app. And got to testing.. 24v 350watt motor with stock gearing pulled me along at 9mph .. stock specs claimed 12mph



Next I upped the power on stock speed controller and motor. 36v lithium power and it was moving a solid 14-16mph for about a half hour.. shortly after no response. Motor was fried..

I purchased the claimed 48v 1800w brushless motor / motor controller on eBay. Had to change chain and sprocket to match motor sprocket as I couldn't find a motor gear to match the stock drive components..




After some help here. ( Thanks Functional artist) I got it bench working and mounted the motor to the kart. The motor bracket has a wider flange and motor shaft was offset more then stock motor so 4 new holes were drilled thru the mount to allow for chain adjustment.

The battery was built out of lipo cells and Vruzend diy battery pack blocks so I didn't have to solder/ weld every connection.. the batteries were sourced on eBay and with my eBay bucks I paid 16 cents for the 100 of them (would of been $50 without using my eBay bucks)

I ended up using 91 cells. 13 in series and 7 paralleled . To give me a total of 17.5 ah. I'm currently letting my wife rip around on it and have been getting a 4volt drop on the battery after 15 minutes of riding.

I can ride the kart but I hang off each and every way possible since it's not made for 6'4" 280lb rider. But I can get on it and ease into it and ride it...

Top speed is 21mph checked multiple times by a garmin gps..

Gearing is a 9 tooth on the motor, 44 tooth on the drive wheel, and tires are 10" tall. With the given specs I should be around 27mph but can't surpass the 21mph so we definitely know the motor is not truthful about rpm..

 

[bob58o]

What are eBay bucks? Can you send me some? They sound like fun.
Can you tell me more about this battery you built. Details, links, Pictures,...

Cool Project!

 

[Whitetrashrocker]

What's the GPS speed with the wife driving.
Not picking on ya but you stated that the first time around you couldn't get to full speed either.

 

[voided]

bob58o ebay bucks are discounts that you aquire by purchasing other items. they give you a percent of what you spend.

white trash rocker, i havent had her on it yet to try it out. but i dont think it will achieve any faster. it felt like there wasnt any gear left.

 

[voided]

some more pictures..

 

[Whitetrashrocker]

white trash rocker, i havent had her on it yet to try it out. but i dont think it will achieve any faster. it felt like there wasnt any gear left.

... I'm currently letting my wife rip around on it and have been getting a 4volt drop on the battery after 15 minutes of riding...
.

Umm

 

[voided]

I know it raises a flag. But this is all new territory for me. This is my first electric build, I'm completely new to electric.



Not sure if everyone else is getting the Photobucket add instead of pictures. If you know of any where that hosts pictures I'll gladly update.

 

[Whitetrashrocker]

Just upload your pics here. Are you using a phone or computer.

 

[bob58o]

Go Advanced.
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Or from a phone when you hit Choose File, it will ask if you want to pick from your photo library or take a new picture.

Don't forget to type something. I always get told on here my responses are too short.

 

[Bbqjoe]

A large round of applause for photobucket!!!!

 

[voided]

And for pictures being upside down... smh they all say they are right side up before the upload..

 

[TIGL]

This is for the power wheels racing series isn't it

 

[voided]

Maybe...... if I finish in time

 

[TIGL]

If you're going to milwaukee, I'll be there with my hackerspace. We're in the screaming yellow Camaro

 

[voided]

We are submitting 2 karts to the New York race next weekend. I call them the tortoise and the hare. My kart is as stated above. Their kart is a modified razor ground force with hover round gear driven motors. Two completely different build styles.

 

[ezcome-ezgo]

I predict you will win, simply because you used this forum as a source of information. Our mojo goes with you.

 

[voided]

Qualified 13th ( middle of the field) first race moved up to top 10 (9th place) and then had problems 2nd and 3rd race with the batteries.. currently 15th for Saturday . But a lot can Change in the endurance race ...

I change the gearing, tires, and worked on the battery Saturday night. Removed the bms as it was shutting the kart down when we pulled more then 30 amps. The slow blow fuse required to race can see short bursts of 60 amps from what other racers told me..

On Sunday we took 5th in a first sprint and burnt the battery up, 7th in the second sprint taking it easy so we could race the final and ran for 71 laps in the endurance race. Made it 50 minutes out of 1:15

Took 8th for the weekend ... got a silver medal for determination that says “have batteries, will race”

 

[voided]

Before and after of the kart.. rubbing is racing

 

[Functional Artist]

Very Kuhl!

50 min of racing with battery power

What battery are you using?

How did you get the kart to stick to the roof?

 

[voided]

Man, I don’t understand why the pictures flip which ever way they want..

I as for batteries. I had 13s8p of lithium manganese 18650 eBay cells.. we ran in the slowest setting and just got laps.. the faster teams were in the 190-210 range for laps. We had a total of 71.