Electric kart

Electric cars, trucks, ATVs, NEVs - things bigger than a motorcycle.
LuigiDesign   1 µW

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Re: Electric kart

Post by LuigiDesign » Apr 02 2018 2:02pm

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:)
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nuxland   100 W

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Re: Electric kart

Post by nuxland » May 12 2018 2:41pm

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

Punx0r   10 GW

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Re: Electric kart

Post by Punx0r » May 12 2018 3:32pm

That is all kinds of cool! :D

futurerel   1 mW

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Re: Electric kart

Post by futurerel » Jun 08 2018 5:31pm

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.

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nuxland   100 W

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Re: Electric kart

Post by nuxland » Jun 11 2018 2:37am

Hey

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

LuigiDesign   1 µW

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Re: Electric kart

Post by LuigiDesign » Jun 11 2018 1:44pm

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!

frodus   10 kW

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Re: Electric kart

Post by frodus » 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?

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nuxland   100 W

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Re: Electric kart

Post by nuxland » Sep 04 2018 2:40am

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.

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nuxland   100 W

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Re: Electric kart

Post by nuxland » Sep 04 2018 2:49am

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

Upperfoot   100 mW

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Re: Electric kart

Post by Upperfoot » Sep 04 2018 7:54am

That's a shame about the 10 laps limitation, that's because of the motor temperature right?

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fechter   100 GW

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Re: Electric kart

Post by fechter » Sep 04 2018 8:36am

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.
"One test is worth a thousand opinions"

frodus   10 kW

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Re: Electric kart

Post by frodus » Sep 04 2018 10:12am

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

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