Thanks for the information! There is some really good stuff in there. One thing that seems to be missing is the timing of the pre-charge. Consider adding information on how to calculate how long the switch should be in the pre-charge before connecting directly.
https://diysolarforum.com/threads/48v-disconnect.62004/post-776166
48V would be an odd max voltage but would make sense for a nominal voltage, so I tend to believe the email from Marinco.
Unfortunately, it is still the closest thing I have found to something that works. I have built it and it works... but the mixed messaging leaves that big question mark. YMMV
Now that the cyber truck uses 48V for their low voltage systems, hopefully we will start seeing more items clearly supporting 48V.