Electric racing kart with QS138 90h or QS 180

[Wimbi39]

Hello everyone

I have read many discussions and build threads in the last week's and this will be my first post.

I have been in motorsports my whole life on both two and four wheels and am fairly new to the EV stuff, I personally own a EV car have a bunch of Oset electric trial bikes at home for the kids. We have a nice outdoor gokart track located just a few miles from my home and and would like to build an electric racing kart using a shifter (KZ) Chassis. I am not new to karting and have a little experience with shifter karts.

My plan is not to build a 60kw monster with huge battery, I am looking for 20-30 solid KW to just have fun at the track and maybe give some of the two smoke karts a run for their money it's a fairly tight track, no long straights, with a 125 shifter maybe 110kmh tops.

I have contacted QS Motors, both the cnqsmotor.com contact and the qsmotor.com contact. Harry at qsmotor says they have already matched a controller with the QS180 and could send it out, joy at cnqsmotor says they still are working on matching a controller with the Motor. Are they both genuine QS Motors and just different distributors or should I stay away from one?

Is the QS180 worth the higher price or would the 138 90h do the job? I bet there is a lot more experience and data with the 138 Motor here, just looking for some advice.

Thanks in advance!

I would like to run it at 72v because of battery availability and weight.

 

[john61ct]

AFAIK

QS is an umbrella "consortium" for marketing purposes, with like 60 different manufacturers participating

 

[j bjork]

As far as I can tell they are both genuine, but it has been discussed back and forth here on the forum before.
There are some info about aliexpress sites on qs sales thread here on the forum, here:
https://endless-sphere.com/forums/viewtopic.php?f=31&t=65972

I dont have any experience with carts, but it seems the average power is usually high?
I think even if you can get enough power from the smaller motor, there probably will be a problem with overheating.
But read some threads here and make your own opinion.
Here is one: https://endless-sphere.com/forums/viewtopic.php?f=34&t=68543

 

[larsb]

Is the QS180 worth the higher price or would the 138 90h do the job? I bet there is a lot more experience and data with the 138 Motor here, just looking for some advice.

Already at least one kart here with 138 70h , it seems to run like hell so i think 138 90h will be enough for you. Can’t remember wich user now but you’ll find it if you search.

 

[Wimbi39]

As far as I can tell they are both genuine, but it has been discussed back and forth here on the forum before.
There are some info about aliexpress sites on qs sales thread here on the forum, here:
https://endless-sphere.com/forums/viewtopic.php?f=31&t=65972

I dont have any experience with carts, but it seems the average power is usually high?
I think even if you can get enough power from the smaller motor, there probably will be a problem with overheating.
But read some threads here and make your own opinion.
Here is one: https://endless-sphere.com/forums/viewtopic.php?f=34&t=68543

Yeah I saw that thread from Nuxland, pretty impressive but honestly I think he overdid it a bit. Running a Motor and controller to the limit all of the time will always be a heat issue. Building custom water and oil cooling and big heavy batteries will just make everything heavier and you will need more power. I think if I can get the 90h to run at 20-25kw output then I should not have a heat problem and wont need to run my equipment to the abolute maximum. I am still uncertain if 72V or 96V would be more efficient.

 

[larsb]

On 20-30kW output level i’d go with 96V to get a bit lower current. Isn’t sure that it will give better efficiency though since the mosfets generally have higher resistance for parts speced above 100V but you'd also get more torque at high rpms.