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Little FOCer! 84V 5kW VESC-Based Controller


  • 15V to 84V operation 20S li-ion
  • Max operating battery amps: 75A
  • Max peak motor amps: 120A
  • 3kw to 5kw max power
  • Has primary features of VESC controllers (FOC, configurable current/temperature limits, throttle response, single motor operation, ect.)
  • IMU for balance applications such as EUCs or any other kind of balance boards.
  • 72mm x 84mm board size.
  • Sophisticated fault detection for over-current, over-voltage, gate drive errors, and more
  • Easy On/Off capability with latching switch of choice
  • ESD Protected IO
  • Designed to enable excellent thermal management and cooling
  • External Bluetooth transceiver module included for App an accessory compatibility
  • 72mm x 84mm board size. 28mm tall with heatsink.


A problem was encountered with the built-in Bluetooth. Metal enclosures can cause the signal to drop and the connection to be lost. For now, the solution to this problem is to use an external Bluetooth module like one would with most VESC controllers. In future updates we will add a Bluetooth module with a more powerful output and a connector for an optional external antenna to the design. Both solutions, present and future, will solve the Bluetooth issue.


Thank you all in this community who have supported my efforts thus so far! I have a small stock of the controllers ready for purchase. This small but manageable stock allows for a gradual approach of me learning business and manufacturing. Product design, manufacturing, quality checks, and logistical handling has been some of the toughest things for to me to learn over the past few years. I appreciate your patience thus far and I don’t intend to stop. I aim to only ever improve every aspect of my product as time goes on. Your support will help me speed up my progression and even hopefully converting this passion in EV tech that I have into a full time career.

This thread will be dedicated to the Little FOCer for any updates, announcements, and discussion.

Original Thread


̶:̶w̶a̶r̶n̶i̶n̶g̶:̶ ̶2̶5̶u̶n̶i̶t̶ ̶r̶e̶s̶t̶o̶c̶k̶ ̶t̶o̶ ̶h̶a̶p̶p̶e̶n̶ ̶a̶t̶ ̶t̶i̶m̶e̶ ̶1̶5̶0̶0̶ ̶C̶S̶T̶ ̶o̶n̶ ̶2̶1̶A̶P̶R̶I̶L̶2̶0̶2̶1̶ ̶:̶w̶a̶r̶n̶i̶n̶g̶:̶

̶M̶a̶x̶i̶m̶u̶m̶ ̶o̶f̶ ̶2̶ ̶c̶o̶n̶t̶r̶o̶l̶l̶e̶r̶s̶ ̶p̶e̶r̶ ̶p̶e̶r̶s̶o̶n̶.̶ ̶I̶f̶ ̶y̶o̶u̶ ̶p̶l̶a̶y̶ ̶g̶a̶m̶e̶s̶ ̶a̶n̶d̶ ̶t̶r̶y̶ ̶t̶o̶ ̶g̶e̶t̶ ̶m̶o̶r̶e̶,̶ ̶I̶’̶l̶l̶ ̶c̶a̶n̶c̶e̶l̶ ̶t̶h̶e̶ ̶e̶x̶c̶e̶s̶s̶i̶v̶e̶ ̶o̶r̶d̶e̶r̶s̶.̶

̶U̶S̶ ̶s̶t̶a̶t̶e̶s̶i̶d̶e̶ ̶o̶r̶d̶e̶r̶s̶ ̶o̶n̶l̶y̶.̶ ̶I̶ ̶c̶a̶n̶’̶t̶ ̶f̶u̶l̶f̶i̶l̶l̶ ̶i̶n̶t̶e̶r̶n̶a̶t̶i̶o̶n̶a̶l̶ ̶o̶r̶d̶e̶r̶s̶ ̶y̶e̶t̶.̶



The global IC shortage is hindering my progress in continuing further. There are some critical ICs that are currently out of stock at a global scale and I’m not able to continue with production with the current design of the Little FOCer.

However, I have already started redesigning the controller to use better stocked ICs that have several pin-to-pin substitutes across multiple brands. This should help alleviate supply chain issues. This also opens up the opportunity for me to strengthen the design even further. Features that I have reserved for a “Turbo” version of the Little FOCer are now being integrated. Motor currents of up to 250A are achievable with the design changes with the same physical profile/dimensions.

Stay tuned. Delayed but not defeated.


So…the website launched and was advertised simultaneously with other internet outlets. In the time it took for this thread to pass moderation, all the stock sold out.

I feel bad that this forum didn’t have a chance to buy and I do apologize for that. I’m gunna handle it a bit differently next time for the next round of units I prepare.




Wahhhhhh sold out already?! I want to cry myself to sleep now :sob::triumph::tired_face::confounded:


Vendors creating product threads in the “Vendor corner” need approval from the mods.


Yeah man. I was unaware of the need for moderation. I personally apologize to you and everyone else here. I’m getting to work ASAP to restock


You sold out in 3 hours? Impressive.


I never would have thought lol. Not blaming the mods. Just my own unawareness here.


So, the magic number was $150.
Good to know.


Why do you all hate me…

Slumps into a corner and eats unfrosted strawberry pop tarts


It looks like the one with connectors and without a heat sink for $305 is still available. Is that correct?

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Are those packages with the connectors still available? It says there are some left…

Was going to ask what the dif is between the 2? Is is jusy heat sink that makes it double the price?

Actually the one with heat sink is cheaper. :scream:

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Finally a 20s vesc. I have been waiting forever to put a vesc in my e bike. Sadly they are sold out already.

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This is a little bit like buying stocks on NASDAQ. :crazy_face:

This is like buying a PS5 on launch day.


Those are special versions meant to be compatible with a popular single-wheeled balance-based contraption :wink:

They’re in the EU and stocked by the distributor. Not sure if he’s shipping those to the states. I’ll ask


Well…I just ordered one… I’d very much appreciate it if it found its way to me in the US. That’s really the project I’m working on, and it’s a very important one for me.
If it’s worth anything, my title will show that I’m kind of a big deal. :innocent: :pray:

Either way, fingers crossed. And I do appreciate your work on this project. Thank you for making these available at all, even if I have to wait.


How many wheels does that vehicle have?