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Re: Electric kart

Posted: Apr 02 2018 2:02pm
by LuigiDesign
It is a good charger,

I made a portable dual charger station, the good thing is it´s very accurate reading mV, IR, and regenerate energy features, meaning that you can discharge some cells to charge another cells...

PS: Be carefull when you connect both output channels to the same cells string. Sure that will be damaged. (Trust me :roll:)

Re: Electric kart

Posted: May 12 2018 2:41pm
by nuxland
Tested how limiting power is affecting motor temp and used energy. And as Latvia has now official electric kart class (two of them, one 15kw and another open up to 25kw) then it was time to test it.
Motor temp were under control with 250A battery limit but lap times were 3sec slower. Also about 1,6Ah went to one lap and without limit it was 2Ah. So 15 laps is possible only with my bigger 40Ah battery. With 25Ah battery i would only use then max 12 laps.
First test ride and i blow a tire in 11th lap. Also it seems that bigger battery cells that I did not replace were sagging more then the new ones :( https://www.youtube.com/watch?v=Rvrq568 ... dpw03c010c

Re: Electric kart

Posted: May 12 2018 3:32pm
by Punx0r
That is all kinds of cool! :D

Re: Electric kart

Posted: Jun 08 2018 5:31pm
by futurerel
Where did you buy a 36 teeth rear sprocket? I've been looking to match your gear ratio to get the same speed as I have the similar motor specs as you.

Re: Electric kart

Posted: Jun 11 2018 2:37am
by nuxland
Hey

Tested VBOX sport in weekend, better than my cycle data logger gps :)
https://www.youtube.com/watch?v=nZ65BTSk4lI

Re: Electric kart

Posted: Jun 11 2018 1:44pm
by LuigiDesign
Futurerel:
On ebay you can find them up to T36 for 428 chains on 50mm axis. https://rover.ebay.com/rover/0/0/0?mpre ... 3144172397

Nuxland: 20Hz GPS is a very smooth device... Good purchase! You are in a next level!

Re: Electric kart

Posted: Jun 18 2018 5:07pm
by frodus
Do you have more information on the telemetry you've designed? This is super interesting. I'm using Sevcon and considering the same BMS.

Is there a project for it somewhere?

Re: Electric kart

Posted: Sep 04 2018 2:40am
by nuxland
frodus wrote:
Jun 18 2018 5:07pm
Do you have more information on the telemetry you've designed? This is super interesting. I'm using Sevcon and considering the same BMS.
Is there a project for it somewhere?
For olimex there is project in https://bitbucket.org/elektrikardid/ but it is not public. But you can't use that for telemetry because olimex clock was faster or slower than real clock and data went out of sync with video, cant remeber.
But for windows computer I have programmed in c# a winform application that is communicating over canbus via can adapter.
The program is a prototype, but it reads sevcon data and also sends questions to bms for the data.

Re: Electric kart

Posted: Sep 04 2018 2:49am
by nuxland
Took some time and parcipated an amateur karting event. They let me race with soviet era karts. There were two classes "Retro N" that is all soviet (frame, motor even the tires are old, made last century). And ´"Retro A" where you could use new frame and tires and even modifye motor a little bit, but motors were soviet made Minsk, CZ or MZ. Reason for me racing with them and not in open class with rotax karts was, that retro had 10 laps but rotax 15. And for me 10 is max i can race.
I had worn rear brakepads and brake fluid started to boil in 7th lap in first race so last 2 laps were without rear brakes. Then I got a little better pads and next two races it almoust worked 10 laps :)
Tested also a cheap ACME 360 cam, so here is two 360 youtube videos from race 1 and race 3.
Race 1
https://www.youtube.com/watch?v=pqyI7Jb8yg0
Race 3
https://www.youtube.com/watch?v=HKf28E4GMgE

Re: Electric kart

Posted: Sep 04 2018 7:54am
by Upperfoot
That's a shame about the 10 laps limitation, that's because of the motor temperature right?

Re: Electric kart

Posted: Sep 04 2018 8:36am
by fechter
Great video! Looks scary as hell. From a standing start you really out pull those two stroke gassers. I see the kart doesn't do so well on the grass.

Are you using regen? It didn't show on the display. It might help keep your brake fluid from boiling, but will add to motor heating.

Re: Electric kart

Posted: Sep 04 2018 10:12am
by frodus
Nuxland,
looks awesome! How was the heat on the motor? What motor are you using right now? I had forgotten which you settled on. I'm considering the ME1507 for testing, and ME1616 if I went to race.

BTW, Hadn't heard from you on the software side of this project, and Jose (e-vektor) is working on an OBDII converter for Sevcon and Zeva BMS. So far it's working and we can see things using Torque. We chose this direction, since torque can do video overlays, logging, and upload to a server if needed.
More info:
viewtopic.php?f=7&t=95067

Re: Electric kart

Posted: Jul 10 2019 6:20am
by Ralyant
Bump, I need updates! :)

Re: Electric kart

Posted: Jul 31 2019 6:38am
by nuxland
have had no time in months to do things i want :( Also have not driven this summer at all and that is sad...

But designed new fixation for my batterys and started to implement these.
It consists of one round metal and one flat metal that go inside each other.
Here are some images that will explan how it will work, but the goal is that I only have to unscrew locking bolt and disconnect wires and then I could change one battery to another just by sliding one out and another in.

Re: Electric kart

Posted: Aug 01 2019 4:51am
by jonescg
TANK!

Loos awesome!

Re: Electric kart

Posted: Sep 11 2019 3:35am
by nuxland
I would say that now fast fixation is 99% done. Just have to find time to test it out in the field this year.

https://youtu.be/TljsV2ZlSLQ

PS! found this metal bar under the table and it suited just fine to help me to install and remove the battery. It gave me just the needed force that i could not give with my hands :)

Re: Electric kart

Posted: Feb 11 2020 3:48pm
by Pota
How did you make and create those battery boxes?
How did you connect those clear plastic parts to the alu?

Re: Electric kart

Posted: Feb 12 2020 2:57am
by nuxland
For bigger 40Ah and 4kwh battery i do not have separate thread (I have in this thread some pictures).
But for 25Ah and 2,5kwh battery i have a separate build thread: viewtopic.php?f=14&t=85912

There is also two youtube videos about these battery-s.
Bigger and smaller: https://youtu.be/8UUFCh3wtCI
Only Small: https://youtu.be/CDkn4za6Rig

PS! I'm also building a third battery and build thread is here: viewtopic.php?f=14&t=97763

I hope these links answer your questions :)

Re: Electric kart

Posted: Apr 01 2020 4:23am
by louis raaijmakers
hey nuxland,
seriously coool posted. i have pulled the trigger and bought some cool parts.
and bought the same parts (motor and controller) u are using.. (sorry but it is so cool :wink: )

any chance you ar willing to share or sell your dcf file?

greetings louis

ps:i will send you a pm if thats oke?