No offense, becuase I’m excited about your work with the vesc firmware and watt control mode. But you clearly haven’t followed any of my work, so let me fill you in…
I have built a bluetooth + iphone app system from the bluetooth communication code on up so I can see the data straight from the VESC while riding. I save data into sessions, so I can go back and look at both the graphs and my avg and max values for all important data the vesc keeps track of. I created a video overlay recorder in my app so I can see how my load changes while riding without the need of exporting data and using a second application to overlay it.
I collect data straight from the vesc while riding. I also have a panel of LCDs on my board to see what the voltage of every cell plus the overall voltage of my board is. These, I have found compared to the VESC’s data, to be somewhat inaccurate.
I tried watt meters, and compared to the vesc’s data, they are highly inaccurate. I trust the data the vesc sees and processes, as we are trusting it when we set all these limits (voltage cutoffs, max temp, max motor amps, max battery amps, ect.).
Here’s a diagram of what the 2 power systems could look like with the raptor 2, to highlight how pointless the vesc-x is with the current battery system:
As you see, you don’t utilize any of the extra amp capabilities of the VESC-X vs a VESC v4.12.
I am in no way saying the VESC-X is not an improvement, just that Jason said the main reason for the VESC-X is so the raptor 2 can do the higher amps the motors need. But the current VESC’s can already do the max amps the space cell 4p version can do, so it’s pointless besides the new BLDC tool for the raptor 2.
The reason cells sag is because your too close to the max discharge the cells can do. When you pull lower amps, like I said, 40 amps for the 4p config, you sag very little. This (and the fact your cells last longer the further you are from your batteries rated max amps) is why there has been a 40 amp fuse on the space cell 4p version.
If your lipos are sagging heavily, then the numbers the manufacurer gave you are bs. A great example of this is multistar lipos. They give normal lipo ratings (20c), but many in the online RC and even endless sphere have tested them and found they are a fraction of what they advertise (maybe only 4c instead of the 20c they advertise).
So even though these cells are rated to 80a, they will sag a lot and won’t last very long.
I will be testing with more lipos in the near future to highlight this, so watch out for some tests in the near future from me about this.