Im using 2x Zippy flightmax 5000 mah 3s 20c.
if this only happens going up hill could it be a heat related issue? maybe it cuts out cause it goes into thermal protection.
Your batteries are rated for 100 amps max, and when you most likely pull 90, you will have some serious voltage sag. again, if you get a wattmeter, you can check the voltage when going uphill. I guess you hit the voltage protection.
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It happens during regular acceleration too. If i pull the trigger too hard it stops immediatly. It´s quite annoying really…
Pretty sure you hit the voltage protection.
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Could batteries with better c-rating solve the problem, since they would not voltage sag as much?
Maybe something similar to this, but for 6s (upgrade to 10s later):
Yes, high C batteries like those will help a lot on voltage sag. But before investing 100$+ in new batteries, i would have bought a wattmeter to check if it really is the voltage sag that is the problem.
Well, ok. Im having a hard time finding a wattmeter that supports up to at least 120a. Could you link me one that is commonly used?
https://hobbyking.com/en_us/turnigy-180a-watt-meter-and-power-analyzer.html This one support 180 amp, up to 12s
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Thanks mate! I really appretiate it! Finally some progress, been trying to solve this for months!
How about getting a cheap battery checker. The alarm will go off when battery cells drop below 3.7 to 3.2v. I had a lot of battery voltage sag with my 25c rated lipo.
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I would also recommend Bluetooth module and phone app like Metr ( there is thread about it here on the forum ). I will show you like your amps and also you can record your trips. Below is my today’s trip where up a Hill I tripped low voltage limit in vesc and shut off my board. It is 37V at the momemnt but with a sag up a hill it went below 35-33 and shut off my board.
Highly recommended for diagnostics and fun!
That is cool. Any reason motor temp isn’t showing?
I think temperature displayed is the Vesc temp. Not sure if motors can be shown. You’ll have to ask @rpasichnyk who developed the app.
Also @emmaanuel has iPhone app (paid ) which works with cheap hm10 Bluetooth modules. I have both apps but haven’t checked out properly @emmaanuel one yet as it just got updated to ackmaniac 3.1 and vedder 3.0 firmware.
I’ll have to check into those for my build. Has some great information.
Yes the motor temp is one of the data available across the app:
Your motor need to have a temp sensor for that. This data is not in the default view, but you can add it.
Update
I ordered the wattmater from Hobbyking that works up to 60V and 180A, it should arrive soon. In the meantime I recorded a video of the problem so you really can see whats happening.
YT Link: https://youtu.be/iRhGuUsmYLc
I should just buy 2 extra batteries and put them in parallel, like 50€ and you will get double the range and it’s better for your batteries. I got also a 120A esc and 2 x 20C batteries in parallel and no problems, enough power.
Update! I finally got the wattmeter and hooked it up to my board. These are the results after the board shut off when riding:
It seems as if i only hit about 35 amps, so the ESC is not the problem. The voltage goes to about 21,7V, is that low enough to trigger the voltage cutoff?
The ESC should be able to handle 120A and I am no where near that on my board.
I used the programming card and set the voltage cutoff to 3.0V. Since I am running at 6s, that would mean that the voltage would have to go under 18V (6 x 3V = 18V) for the voltage cutoff to kick in, right?
If this is correct, neither the ESC or the batteries are the problem… If I am wrong, please help me understand! 
I did another test run:
