Noob question thread! 😀 ask your questions here!

FOCbox can run FOC reliably. TB vescs are good too. Most of us have problems with the maytechs. The problem is that they are the most fault intolerant. You do one thing wrong and BOOM congratulations you’ve got a dead weight now. I’ve done my fair share of research and decided to buy the maytechs. One died after a year because of water damage. Other than that I haven’t got any problems so far. Best investment I’ve ever done.

So, for you personally, you’ve ran Maytech’s for quite some time and no issues? Are you running BLDC or FOC 8s, 10s, 12s?

BLDC, 10s. No issues non user related whatsoever. Will try FOC soon.

Say bye bye DRV!!

What kind of fuses do people use inline with the main discharge lead?

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Duty cycle.

Let’s setup an example. 10s2p 30q, nominal 36v, with an 40a constant current output

Your batt max is 40a Your motor max is 80a

You battery can provide 36v * 40A = 1440Watts

Duty cycle in simple terms is a percentage of work, from the main power source. For example 25% duty of 36v = 9v

(36v * 0.25 duty) * 80 motor amps = 720watts

Your battery can only provide 1440 watts 1440W/80a = 18v or 50% duty

36v * 0.5 duty = 18v

So above 50% duty, the motor max amperage will drop, to to your battery max limit

1440W/(36v * 0.51 duty) = 78.43A motor max 1440W/(36v * 0.52 duty) = 76.92A motor max

Etc…

duty-cycle peakwatts motorpower voltage

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How many constant current amps is a 10s4p of 30q batteries.

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30q is 15A rated. But tested to be 20 provided it’s kept below 80c.

So manufacturer 15A*4p=60

Tested rating (mooch) 20a*4p=80

Pick your poison

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40a fuse should be fine for 90% of the builds out there. If you have some crazy 10s6p mountain board, go higher

My DIY esk8 is in progress… in the meantime still troubleshooting my Blink S since I commute with it.

If the hub motor overheated, could that permanently ruin the magnets in the hub shell and explain the loss of acceleration/torque/top speed?

Thought I’d ask before tearing apart the battery looking for dead cells.

Thanks!

12S4p vesc6 build with relative big motors. But Its not the size im after but what form factor.

So it would be 2160 Watts for my battery divided by 46 max amps of my motors would be 46.95volts so would that be like 95% duty cycle?

are you using a vedder anti spark?

Littelfuse_BoltDown_BF1_58V

https://www.mouser.de/Littelfuse/Automotive-Fuses/1425631-BF1-Series/_/N-1z0zlhtZba8b5Z1yycd3y

I have seen these used a bunch of times. They are rated for 58V which is important since the normal 32V automotive fuses won’t cut it at 12s.

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Really it is your power system can provide more then your motor is rated for.

So you will never hit your peak battery wattage with only 46 motor amps…

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Well that is good and reassuring to hear.

Im new to the whole esk8 scene and reading for most of that but I do have a couple of questions. This is my overview of my electronics.

Does this look correct to you guys?

Hello,

I apologize if this isnt the right place to post this, but I searched the forum and all over youtube looking for an answer but I couldnt find anything. Hopefully someone here can help me, or direct me in a place that will help me out.

After watching Low Guido’s Chop Shop’s youtube video I was inspired to copy him and learn about electronics and try out building a skateboard even though I have zero knowledge. I bought:

HobbyKing® ™ X-Car Beast Series ESC 1:8 Scale 150A Turnigy Aerodrive SK3 - 5055-280KV Brushless Outrunner Motor Turnigy 5000mAh 3S 25C Lipo Pack W/XT-90 (x2) Hobbyking GT2E AFHDS 2A 2.4ghz 2 Channel Radio System W/ Receiver

I ended up soldering the two lipo batteries together in series, and connected them successfully to the X-Car ESC. When I end up powering up the ESC, I figure that I have synced the remote to the ESC because the motor does a small jolt and it is followed by several beeps. However when I try to throttle the remote, nothing happens. Am i missing something? Any reply would be appreciated thank you.

Im looking to Extend range and keep the same speed on my MotoTec Board, both motors are brushed 800w, belt driven, and the battery is 3, 12v 14ah Lead-Acid Batteries. I weight 190LBS and would average 10 miles with and average speed of 18-20mph on mostly flat ground, but switched between grass and concrete. and im looking to upgrade the battery to a 36v 28ah LifePo4

  1. Would that even work with my currect set up without swapping parts?
  2. If it did work how far could i expect to go and how fast?

let me know if you need more info, any help is appreciated.

A skateboard controller might be better than a car controller because you don’t know how smooth the braking is on the car controller. If it was jerky it wouldn’t affect the car too much but can throw you off a skateboard. It’s important that it has really smooth transitions.