Yes, this picture is the exact same as the first picture I posted entitled “Method 2”. But as also mentioned on that page, it requires the GEC be no smaller than the largest conductor in the DC system. Which in my system would be 4/0 at almost 40 feet.
I only came back to this thread to share the solution in case someone encounters it in the future. My experience is not theory. It is built, finished, operational, code compliant and has passed inspection.
When I encounter this situation again in the future, even if the system is 24v, I will do it the same way. I’m not interested in debate on whether or not code would require this method in a 24v system. However I do know that code requires it here for a 48v system.
In short - Future internet user that stumbles upon this thread: If you’re building a 48v system and your AC and DC panels are far enough away from each other that that the methods proposed in the Magnum manual are cost prohibitive, please see the photo I attached mid thread for a solution that is both code compliant and doesn’t require excessively long lengths of extremely heavy gauge wire. Best of luck.