The unit has 5 caps rated at 330UF and 50Volts. If I replace the caps with 330UF 100 volt caps, will this allow me to use the unit at 72 volts input voltage?
I see what looks like 2 fets on the board, I am not sure if those have a voltage limitation.
Usually not the capacitors make the voltage limit, but semiconductors.
But in detail you have to check every single device if ut is able to withstand the higher voltage.