I got two 6S LIPO’s last week. I was going to save them for my second build (in progress) but was having issues charging my 6S batteries (3x2S LIPO’s) so decided to switch and use them on my current board (1st build). After charging them up and changing settings with VESC tool (6S to 12S) I went out for a test ride. They are excellent, super fast (faster than I really want to go) which is exactly what I was looking for but before I could finish my ride they slowed way down to a crawl, but got me home. I thought it might have been the capacity (old setup was 5600 mah, 50-100c discharge) and new batteries are 4500 mah, 40c discharge) but after balance charging them again (all cells at 4.20V) and going out for a second ride a few days later, I experienced the same thing. So I checked the voltage when I got home to discover all cells at 3.95 (70% of full charge) so I took off the VESC cover and found VESC to be a bit hotter than I think it should be.
Here is my question. Is the VESC designed to reduce power automatically when it exceeds a certain temperature to prevent it from over heating? When I changed settings with VESC tool from 6S to 12S I also changed motor max setting to 85A and battery max setting to 50A which is higher setting than previous on 6S batteries. I have done a search for heat sinks for VESC and will probably remove the heavy rubber heat shrink that (Thermal M16) put on it after repairing it for me and also add a chunk of aluminum to draw heat away from VESC mother board. I can also drill ventilation holes in my VESC enclosure to increase airflow. I also must share that I live in Hawaii and am using my board on dry blacktop roads at low 80 degree days. Are there any settings I can change that will help the VESC run cooler without slowing me down too much? Thanks in advance for any advice you might be able to share.