I am sure it can also take a little higher voltage, look at these low Kv. 200A will make the overload, you need to limit this current to the specified 80A, maybe also lower. Maybe a high quality VESC from Trampa will do.
I personally wouldn’t go under 120A constant current ESC. There is a robot group that have designed a 200A VESC but it is very expensive…
Maytech have also just released 100A VESC which could be an option.
I had my first test with the Flier ESC on water this day and I really can recommend it. You can limit the max. “forward power” on this one. For me 75% was more than enough. It really helped to have a finer throttle handling.
You also can adjust the throttle curve.
I burned two seakings with my setup. This day was the first try without any smoke!!! Temperature went to 60 degree at 110amps, 12S, 22km|h without foiling.
My pump is only 12V 5W and I did not notice any temperature increase while pulling about 80A from my custom watercooled Vesc. I assume about 100W of losses.
Your post got me interested in how much flow is actually necessary. In summary, 2L/min is still way overkill.
In my spreadsheet here
it looks like even if you assume 30°C inlet temperature and only allow for 10°C temperature rise you can still dispose of about 1,4 kilowatts of heat. I hope I did not miss any conversion error, otherwise please notify me.
The only problem remaining is if the cooling solution in your ESC is able to transfer the heat to the water. If the water only flows through the ESC without any connection to the hot parts it won’t help
heifi esc boat cut at 125°C for exemple, since you have a Flir , i would look for hot spot on the esc, mesured water temp in and out, i think you can get better cooling plate mounted on the esc, but you need to open it, some having not cooling everywhere as it should, there is some many flier it is hard to find pics of the inside…