I’m saying you should design the max speed of your board to be a speed you plan on going. Instead of 190 kV motors on 12s I could rewind them to be 380 kv. Theoretically my top speed would double and the motors efficiency will remain about the same at the same speed and load, but I will also draw twice the amps at half the voltage from the ESC to get the same power. Twice the amps means four times the losses in the power stage.
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I think it depends on your goal and what you care about and are able to mitigate e.g. if I want a board that can go up to 80kph, then that’s what I build to.
That doesn’t mean I’ll spend a lot of time even close to that. In practice it may mean I spend a lot of time at 60kph and below, which is just fact for a lot of people not on a racetrack.
As long as I’m able to design my system to manage the heat generated, and I’m okay with the compromises, it shouldn’t matter how I use it.
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Yes definitely, but I generally don’t advise someone to build a board to go over 40 mph because it seems like a good way to crack your skull open and when you do it you end up wasting a bunch of power for your regular riding. You asked if you can do it, the answer is generally yes but should you do it I think the answer is usually no. But it all depends on goals, I just want to be clear that it is an engineering question and there are tradeoffs with efficiency.
Just like right now when people build 12s setups we tell them to go around the 150-210 kV range, when you go 18s I’d recommend to go in the 100-150 kV range. Everything still works if you don’t do that but you might get some undesirable performance trade-offs. I also don’t think any of us are yet sure what the long term effects of running a 190 kV motor at those higher RPMs will do to the bearings.
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By the sound of it, the recommendation for 16S should be 130-190 kV then.
I get there are engineering trade-offs, but then it also depends on how you use it and where you want your power to be.
I don’t care much for the 0-30kph acceleration and sustained speed, and having a system that has better acceleration and capability to maintain speed in the 30-60kph range would be better for me.
At the same time I also want to be able to crank it up a notch to 80kph on occasion.
I’m asking these questions in advance because obviously if I want to build a higher Voltage esk8, I need to think it through.
Your replies have been invaluable, just wanted you to know.
@BillGordon I’m wondering whether this conversation shouldn’t be in the 13S thread instead.
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Yes it should probably be moved, my bad for hijacking.
150 kV*12s/16s =~ 110 kV
210 kV * 12s/16s =~ 160 kV
It won’t behave quite the same way as gearing in a car would. You will get (theoretically) flat max torque across all speeds (except maybe the last 2-5% as you approach max speed). The torque will linearly be related to the max amps set and motor kV, but changing kV will change the max amps the motor can handle. In general for a given motor design there will be a fixed max continuous torque it can output if you wind it with the same amount of copper but different kV.
You run into trouble when the ESC starts becoming the thing creating the ceiling for your maximum amps settings, then you lose torque in the system you could otherwise be enjoying.
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Watch out for thermal throttling, and watch motor temp is what I’m reading.
Yes you could back calculate from the max continuous amps of the ESC and the winding resistance what an appropriate kV would be. Additionally losing efficiency is never nice if you don’t want to go fast so then the rule is just lower the kV until your max speed is where you want it.
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Now that I’ve taken the 2x Stormcore 100S on 20S1P LiFePO4 out for two rides, seemingly neither the 192kV 6374 SK3’s or the ESCs break a sweat.
They have plenty of power throughout the RPM range, and so far only luke warm to the touch. We’ll see how this changes as I go out for longer, faster rides.
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Anyone have much experience with the Trampa VESC 100/250 or know of any other suitable ESC’s for an 18S setup?
Ideally wanted to go for the Stormcore 100D but it seems they’re still ironing out all the issues.
Also @shaman 's Some New FOCers (84V VESC 6 based controllers) is still under development as well. Similar story with MakerX’s 100V ESC
Are there any others out there?
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I’d say the trampa has the best resale value
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Bumping this since the first Lacroix SS reviews are starting to come out.
At the 5:00 mark is interesting. Make of it what you will but shout out to the people who didn’t buy the 16s hype. You are more level-headed than me 
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Please tell me more about your bushing settings.
Anybody can recommend a good esc for a 14s4p battery. I’ve been looking for a stormcore 100d but no luck…
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you could try a spintend ubox
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He’s gone to the shadows. Doubt you’ll get a reply.
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Side note hes so wrong with that statement hahaha. Aged so poorly.
My setup on 12s would have piss top speed at like 26mph. I’m still able to run the same kv at higher voltage for more speed.
He’s saying this under the impression that nobody would dare run the same motors at higher voltages.
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For all the sheeple saying HV is faster, I have three letters to say to you:
SRB
The one problem is we don’t have vescs capable of that much current, unless you plan on fixing that 
makerx is the closest we’ve gotten to that.
I think a board with 2 little focers on 20s can come very close to stooge boards, at least in raw wattage they do.
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Sure, I don’t disagree. But a lot of people get confused when its not the higher voltage enabling more power, its the higher wattage vesc. A lot of people have their motors running on the limit with 12S, and they think buying lower kv of the same motors and a less reliable HV vesc is going to unlock turbo mode.
I get mad that people think high voltage, same wattage gives more power. Seen so many people injured from blowing up HV vescs. I see far fewer failures on 12S now days, which is why I’m sticking to 12S and finding ways to increase the current with higher wattage 12S controllers.
It’s misleading to fixate on voltage. Just look at the latest makerx D series controllers, they have 3 different voltages but are all rated at the same wattage, because usually if you double the voltage of a mosfet you double its resistance and halve its current rating
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