We loose a lot out of the dual volt running 60 of its 100A @12v(current limitations in the windings). With both legs Fully loaded by lighting and depleted batts, it is only capable of ~1950watts. 100A @ 24V is 2400W, so single voltage has ~19% more output available.
if you are still running the 4 battery config, you should really consider dropping to 2 batteries. The alt has trouble keeping them fully charged unless you run long hours. Low state of charge is the biggest killer of batteries which in turn keep the alt in a constant state of overload, shortening its life as well.
For a given amount of power(watts), 24V has the advantage of requiring 1/2 the current, and needing 1/2 the wire gauge, so a 24v solar install has a very large infrastructure advantage ofer a 12v system, especially when you consider the panels are on top of the box/habitat and the batteries are under the box…
You can also have lower current draws from the batteries for a given load so lower Pukert losses in the batteries…