I have a multi output PS for a machine that is real close to what we need. One of the cars supplies 40A of 5V so I want to supply my 5V directly from that as well as parallel a boost transformer to get my required 8V from it as well. Other voltages include -5 and 24V.
I want to boost the 5V so even in a worst case, I will never over volt the 8V side. What kind of transformer do I need? I will need no more than 10A of 8V and will probably add my own fuse in the system since the 40A supply is extreme in this case.