Endless Sphere

Getting the cells pre-heated even to borderline damaging temps does reduce the damage (lost cycles) inflicted by high rate charging. I think it would be very hard to push these limits the way Tesla engineers can. But there are use cases where it's worth trying, fast charging being essential to the ...

As an enthusiast for all things electric, I've always wondered what allows fast charging Lets take the Model 3 as the prime example at the current date, capable of a 250 kW peak charging rate, with a 96s46p, taking into account that that peak only happens at low state of charge, we are taking about ...

docware, thanks a lot for undertaking this endeavor, doing a whole lot of cell cycling tests is something I always wanted to do, but unfortunately I have no conditions at the moment or in the foreseeable future One suggestion for the future of the tests I’ve mainly build electrical skateboards, and ...

A long time I did mine, but this should be helpful to others In short, use the same capacity cells I used NCR18650B, 3400 mAh vs the 2200 mAh original, at the first charge and discharge it worked, the BMS was calibrating. It lasted a long time compared to the old battery, nearly doubled As soon the ...

Thanks for the tips Did a few more tests using a short lead with the switch really close and all problems solved, so now I have to find a way to remove the noise from the long cable, at least its not another VESC down the drain If you are interested I documented the build here, still a work in progr...

Hi Kepler I've been a fan of your drive for a long time, and made a fixed version in my bike that I was road testing with just a simple ADC button connected to the VESC for a long time Now that everything is tested I've implemented a more complex single button control using an AtTiny but the same pr...

In theory, the bearings on the axle should take the loading between hub cover and axle, but some people have discussed breakage of plastic gears inside geared hubs, or of teh clutch itself. I'm not certain that's directly from the impact, but might rather be from the motor / wheel spinning really f...

Hey guys, for a long time I've been thinking if switching my bike to a low power hub motor like the G310, I don't need much power, currently I run a friction drive with RC motors, but due to a bunch of factors the low speed torque is bad What worries me is if they can take the way I ride, I like to ...

If possible post a picture or a schematic of how you wired the back, but if only 3 nickel strips are used for the serial connections there is your problem, and if it is, I recommend you stop using the pack until fixed, the least that can happen is these 3 nickel strips melt, the worst they melt and ...

Everything works perfectly now. Switched to copper and two batteries in parallel, using 1.5 and 6ms I can weld 0.15mm nickel with no problem

Just finished mine I have two problems, but both are easily mended First, apparently my battery isn't up to the job, it's a 3S 5000mah 35-70C Turnigy nanotech, i preferred to teste with it since car batteries are not cheap around here. First i need to charge it since it was sitting for more than 2 y...

Thanks, I will try them, will report back soon

Nice work Could you post your laptop ad battery models? I've already purchased the cells, just have to finish my spot welder to replace them, but I've read somewhere that some BMS's can't be disconnected and reconnected or they enter a protection mode that bricks it, if we have the same model it wou...

Thanks fechter, i will try it and see what happens

Hello guys, i'm about to start building my spot welder Anyone tried using lipos to weld 0.15mm nickel? i have two Nanotech's 5000mah 35-70C laying around that in theory should be able to reach 900A considering the internal resistance, a car battery is expensive around here and i don't want to risk d...

Hardergamer wrote:Really 60%!? WOW Would it not be cheaper to get them from Japan.

It's luck around here, generally things that come from asia haver a higher chance of being taxed

Dicast wrote:Hi

Do you ship to Brazil?
If yes.how much would cost?

You have to send a PM for him to answer, i'm from Brazil too and the shipping for 30 cells was cheap, unfortunately it's almost certain that you will have to pay the 60% import fee + the abusive fixed R$12,00 fee, at least that was my case

have you seen this? https://www.emetor.com/ MotorCAD is the industry standard for thermal analysis of motors but they now have an electromagnetic module that works in conjunction. All the commercial software is extrmely expensive. I would rough out the design in Emetor before choosing anything more...

That would be a way, but my mais objective is to learn something new, if in the end i can make a good motor that's great, but if the motor its not so good but i know what to improve or where i've screwed, that's even better I've been following all the hubs on eboard section, from what i've seen from...

Hello guys, I will shortly start a work in a research in my university to develop and manufacture a hub motor for electric skateboards, my goal is to optimize it as much as possible, since the application requires it or i will step on problems like overheating and huge consumption. So to the point, ...

This seems to be the same type i got when reading the serial while it is sending data to VESC And speaking on serial, finally everything works, rode my board a lot this last days, but today when i was implementing the battery capacity led's i realized i'm no getting any data back from VESC, anyone h...

[*]Funny thing, when everything seems to be going, something have to screw up Was on the verge of finishing the board again, testing on 10S for the first time, BLDC working, FOC working, and then on one of the accelerations on the bench the motor just made a high pitched sound and after rebooting it...

I'm using it with a few modifications for leds(was using, my board is down for a few months so far)

Try using the abs tachometer, any situation that makes the wheels go backwards? this would add negative distance if the abs is not used

I've checked here, the pulse number that i said, i'ts the motor poles*3, for a 14 pole motor that gives 42 pulses per rotation. As i understand, that's the number of sequencial phase activation to complete a full rotation. For the ERPM, i got RPM = ERPM*2/ Motor_Poles See if this works #define DIA_W...

rpm is the instantaneous rotational speed of the motor, tachometer is the number of pulses, or absolute number in case of abs_tachometer, the VESC has counted since powered on, in my tests i got 40 pulses per full rotation in a 14 pole motor, for speed you should use only the rpm and apply the corre...