[EuroTrash]

I purchased an electric kart from a kart shop in California. They work with gas karts, and knew absolutely nothing about it. Someone built this kart exactly like it sits, and I really want to get it moving.

I have since been able to figure out the agni 95r motor is good, and so is the Alltrax axe7245 controller. I just need to add the juice!

The controller programming was set to 60V low shutoff, 90V high shutoff, so I assum they were running 72V.

There are 2 battery boxes wired in parallel, so both boxes will need 72v. They each measure 19" long, 5- 5/8" wide, 5- 7/8" tall.

The agni 95r shows a continuous 230A rating, 400A max. 18650 cells do not put out enough A. I'm trying to get as much run time as possible from the space I have.

Im open to suggestions! Just please don't open the debate about how this agni is going to fail, why I didn't use xyz controller, and how expensive these batteries will cost. This is my first electric fun toy, and I really just want to play!

Thanks in advance!

 

[Karter2]

RC lipo is the best performance for price for any race vehicle

 

[EuroTrash]

RC lipo is the best performance for price for any race vehicle

Thank you for your input! There are a lot of sources for those. Is there anywhere you have had good experience with?

 

[piotrsko]

Almost looks like it was set up for Volt packs @96 nominal

 

[EuroTrash]

Almost looks like it was set up for Volt packs @96 nominal

I considered this, but the 95r is only rated to 72v and 6000rpm. Do you have any data that says anything else would be ok?

 

[piotrsko]

Dont care about the motor voltage rating, what is the controller rated for max voltage? Motor voltage control is the controller's job.

 

[kennybobby]

What is the diameter/size of the rear tires, and how many teeth on the sprockets?

Looks like a fun project!

 

[EuroTrash]

Dont care about the motor voltage rating, what is the controller rated for max voltage? Motor voltage control is the controller's job.

The Alltrax AXE7245 is rated for 72V, 450A. This was my other deciding factor for staying 72V

 

[EuroTrash]

What is the diameter/size of the rear tires, and how many teeth on the sprockets?

Looks like a fun project!

Using the sprocket sizes and size of the tires, I computed 64 mph top speed at 6000 rpm. I know there is margin of error depending on tire pressure and such, but I think somewhere in that neighborhood is feasible.

 

[kennybobby]

What's the weight of the kart?

i'd still like to know the answer to my previous questions even though you computed top speed. i might like to build one too...

The max voltage spec for the alltrax is 90VDC.

 

[EuroTrash]

What's the weight of the kart?

i'd still like to know the answer to my previous questions even though you computed top speed. i might like to build one too...

The max voltage spec for the alltrax is 90VDC.

Drive gear has 15 teeth, driven gear 44. I can not find my initial measurements, but found the tire size by looking up the tire make and model. The tires are Bridue stone 7.1/11.0-5 dr11 ylb

 

[Karter2]

Rc lipo from Hobby King has always been fairly reliable with a good warranty return service.
Lonestar Racing (John Metric on this forum) sell the best lipo available .
I suspect a Volt module would be a difficulr fit without serious modifications to the existing set up.
This thread will be very informative to you..
https://endless-sphere.com/forums/viewtopic.php?f=34&t=68543

 

[EuroTrash]

Rc lipo from Hobby King has always been fairly reliable with a good warranty return service.
Lonestar Racing (John Metric on this forum) sell the best lipo available .
I suspect a Volt module would be a difficulr fit without serious modifications to the existing set up.
This thread will be very informative to you..
https://endless-sphere.com/forums/viewtopic.php?f=34&t=68543

Thanks for the input! That was a great read but never ran across that when I was searching. So much of his work directly relates to what I'm doing.

 

[EuroTrash]

I would suggest NEW Volt batteries that are built like a tank. I also
have the NEW Bosch batteries designed for the BMW. Don't buy Lipo, unless you want lots of failures, lower voltage and more difficult to
connect to get the desired voltage. Ask yourself, which EV manufacturer used Lipo, NONE. Don't buy the Chinese stuff you see advertised everywhere as the failure rate is higher than other chemistries like th Volt uses.

The current battery box dimensions will not allow for anything that big. If I completely scrapped the box setup, there is no place on the kart large enough to put even 1 volt battery. I think 2 adds too much weight, and more AH than what's needed.

I have a 48v version of this battery in my Hustler Zeon and it works great! I'm just not sure it fits this mold, unless you have a better way to make this work. I'm always open to suggestions. Thanks!

 

[Karter2]

...... Ask yourself, which EV manufacturer used Lipo, NONE. Don't buy the Chinese stuff you see advertised everywhere as the failure rate is higher than other chemistries like th Volt uses.

But this is not an EV. It does not have the same requirements or limitations that an EV application has.
A EKart needs maximum power density with the only real restriction being cost.
Even cycle life and efficiency can be low priority .
Good , hich C rate, RC lipo is the logical choice for a powerful pack at reasonable cost .