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PT, I am still not getting this Magnum business. You said:
"Limiting input to 13 amps @ 122 volts (1586 watts) limited output to 108 amps @ 14.6 volts DC"
But Output 108 x 14.6 is 1577 watts. Magnum claims efficiency is 87%, so input watts would be 1813 watts, not 1586w.
Then you apply the PF (0.97 say) to the input watts to get VA required from the power source so 1813/97 = 1869VA (remember my 100 amper needs 1910VA)
So setting the input limit to 13a cannot be actually limiting the input the way you think or the output could not be that 108 x 14.6.
Something is funny about that Magnum input limit setting as to what it actually does inside the Magnum.