O/k fine.
The exploding mosfet experience was on the other thread, in which the original poster was asking about the possibility of coupling together two separate battery banks of different voltage (24v and 48v).
That situation can sometimes arise when people decide to do a significant system upgrade.
On the surface, it sounds like an impossible problem, but quite by accident while working on something rather different, I came up with a very simple way that this CAN be done, with the right approach.
Its not wild pie in the sky stuff either, switching power supply design for commercial products used to be part of my day job.
I may be a newborn here on this Forum, but I am also a retired power electronics design engineer. I do not know it all, and never will, but I may be able to pass on some of the ideas that I have from time to time for the benefit of other Forum members.