I am building a custom ROV utilizing a lot of the electronics from the BlueROV. I am looking at powering it with 50volts. Is there a way to modify the Power Sence Module so that it can accept the higher voltage?
This is not possible. You would need to swap out essentially every component for ones rated for use up to at least 50 v, you would be much better off using a different power module, such as a Mauch PL Series which is rated for use up to 85 v.