Building an electric racing gokart (on my bucket list )

ok, i've moved it over to the other thread for you. :)

i recommeded making the wiring diagram and keeping it updated because it is a huge pita to figure out wiring while troulbeshooting something later on, especially if you're looking for something aused by phsycial damage like in a crash (which we know can never happen in a race on a track :lol: ) i've had to deal with is problem numerous times ove rthe years with my experiments because i don't take my own advice. :oops:
 
I've finished the build, and done testing, and am quite happy with the speed. I'm going tru the program to make some small changes. Question... on the port settings there's 6 round/squares IO,SW,LA,F,U,D what do they mean ? Since all my gear comes from a scooter, it don't have reverse well it's there on PA0 dot on F, but doesn't work, and I can do without, but PB3 has sport mode, wich I would like, not working. 1-2-3 mode is working and I thought it was working, but it was gear 3. I wanted to have a puss to pass😊
 
amberwolf said:
ok, i've moved it over to the other thread for you. :)

i recommeded making the wiring diagram and keeping it updated because it is a huge pita to figure out wiring while troulbeshooting something later on, especially if you're looking for something aused by phsycial damage like in a crash (which we know can never happen in a race on a track :lol: ) i've had to deal with is problem numerous times ove rthe years with my experiments because i don't take my own advice. :oops:
Click to expand...
I've finished the build, and done testing, and am quite happy with the speed. I'm going tru the program to make some small changes. Question... on the Votol 100 port settings there's 6 round/squares IO,SW,LA,F,U,D what do they mean ? Since all my gear comes from a scooter, it don't have reverse well it's there on PA0 dot on F, but doesn't work, and I can do without, but PB3 has sport mode, wich I would like, not working. 1-2-3 mode is working and I thought it was working, but it was gear 3. I wanted to have a puss to pass😊
I don't understand how to put my questions first on the list for people to see, they shouldn't have to go tru 2 pages to find what it's all about, or am I not understanding how to do this.
Thank you for your advise.
 
Sorry this may not be the right place to ask, but here goes: what setting in a votol em 100 controller program turns it off automatically. I can load a bin file before and after modifying. I can show more like pictures, but there's some allready somewhere. Motor speed was around 5000, I changed amp from 65 to 85 and a couple of other things, and motor spun up to 7500. Test before changes 81 kph after 100 kph and it shut down, disconnected the batteries 2 off 76 volt 30 amp in parallel, ran again after connection.
 
I've finished my racing gokart using motors, controllers and batteries from 2 identical step through scooters. I went racing against modified 4 strokers, but weren't fast enough, so now I've modified the controllers, and gained about 40% more speed, took it for a test drive, switched "gears" and reached 100 km/h when it shut off. I disconnected the batteries and reconnected them and was going again. I tried again, and the same happened.
Here's some settings from the scooter controllers Votol em 100:
Page 2: HDC lowrst speed 5050 which I changed to 6050 but I also disabled HDC. When tested on the trolley it spun 7500 rpm. Should I keep the HDC and make 6050 to 7500 rpm, or is something else I can do.
I need this fixed before next race meeting 27 of April
 
Last edited:
Is the battery spec high enough to even keep up with the load?

Sounds like the BMS shutting off from high current or maybe voltage sag.
 
eee291 said:
Is the battery spec high enough to even keep up with the load?

Sounds like the BMS shutting off from high current or maybe voltage sag.
Click to expand...
I've no idea of the spec, the batteries are from the scooters, 2 from each. The amps was set at 65, I reset it to 85, which is max for Votol 100, so maybe set at 80 or 75, and see how it goes. But I thought there would be a max rpm to be set and I hit it. Mind you 2 battries in parallel both was turned off or it was the controllers that turned off. Had to disconnect and reconnect batteries to go again
 
If you have to reconnect the battery in order to get power from them it's the BMS 100%
You may need a third battery or even fourth.

I personally don't really like grouping a bunch of batteries together, ideally you'd have one capable battery.
 
ZenaWarrior said:
Sorry this may not be the right place to ask, but here goes: what setting in a votol em 100 controller program turns it off automatically.
Click to expand...
Turns off the controller?
Or turns off the system?
Is power completely lost (no voltage to controller)?


ZenaWarrior said:
Motor speed was around 5000, I changed amp from 65 to 85 and a couple of other things, and motor spun up to 7500. Test before changes 81 kph after 100 kph and it shut down, disconnected the batteries 2 off 76 volt 30 amp in parallel, ran again after connection..
Click to expand...
If you are using batteries only capable of 30A, two in parallel can only handle 60A. So you cannot set the controller any higher than 60A battery current limit, or you are exceeding the battery capability.

Doing that means either damaging the BMS or the cells, or having hte BMS protect the cells from you by turning off all output so you don't damage the cells in a way that can lead to a fire.
 
Did the system actually power off, no voltage to the controllers? If so, it's the BMS that turned off to protect the cells from damage that can lead to a fire (doing it's job).

In this event, you would need to be monitoring the voltage and current to and from the battery from the controller(s) to see which one exceeds the BMS limits.


If the system does not actually lose voltage to the controller(s), then it's a controller setting or hardware limitation being exceeded, so it's shutting off the motor to prevent damage to either motor or controller or battery, depending on what limit is being exceeded.

If you don't have a wattmeter on the system that can at minimum remember max amps, min voltage, max watts, etc., I'd recommend installing one between battery and controllers. You can get cheap ones on amazon, ebay, etc., like this one that I've bought and verified power up of but haven't used on a system yet https://www.amazon.com/dp/B013PKYILS so can't say how well it works. There are lots of similar ones out there.


Also, from your other post on the subject in a different thread:

ZenaWarrior said:
Motor speed was around 5000, I changed amp from 65 to 85 and a couple of other things, and motor spun up to 7500. Test before changes 81 kph after 100 kph and it shut down, disconnected the batteries 2 off 76 volt 30 amp in parallel, ran again after connection..
Click to expand...
If you are using batteries only capable of 30A, two in parallel can only handle 60A. So you cannot set the controller any higher than 60A battery current limit, or you are exceeding the battery capability.

Doing that means either damaging the BMS or the cells, or having hte BMS protect the cells from you by turning off all output so you don't damage the cells in a way that can lead to a fire.
 
You must log in or register to reply here.
Back
Top