https://endless-sphere.com/forums/viewtopic.php?f=6&t=95745&p=1428914#p1428914
It depends on the FETs and how much current you end up with. Many times you can get away with just cooling the outside of the controller adequately (mounted in the open where there is some air flow).newbiehere said:My controller has 6 mosfets, so if I increase the amp capacity of the shunt, I think i must add more mosfets. If I added 6 more mosfets, could I add them in parallel, or does this mod require a new board and controller?
newbiehere said:for example, on a display panel,where I have my arduino nano display, could a variable pot be used instead of a solder shunt? I guess the resistor values would have to be very small for this to work
Sure you can. But it will probably be bigger than teh whole controller; possibly bigger than a typical DD hubmotor.fechter said:Not really. You won't find a variable resistor that can handle that kind of current.
newbiehere said:so i dremel tool off some of the trace, then put a pot in between? if its a 3 terminal pot, how do I connect the terminals?
I'd like to increase a controller from 25A to ~34A.
I'll use the shunt modification, but like to be a bit precise.
The controller, currently use 2x 5 mohm shunts.
So, please tel me if I'm right :
2x5mohms= 2.5 mohms
2.5 mohms -> 25A
??? mohms -> 34A
From 25A to 34A, it's +36%
So, 2.5 mohms - 36% = 1.6 mohms
3x 5 mohms =~1.67 mohms
I finally just need to add a 3rd 5 milliohms shunt on my controller to reach my goal ?