Using the calculator above, my 0.6v drop with 12v works with cu #1AWG at 24 ft round trip at 100 amps.
If I just change to 24v and 50 amps, leave the wiring the same, voltage drop should be half (not double) but percentage drop is 1/4.
So the idea I had that 1.2 with 24 is equivalent to 0.6 with 12 is wrong by a whole bunch. I have not figured out what is going on though.
Does that mean his 1.2v drop with 24v is really horrible? But it doesn't seem to make it any worse for hitting the inverter's alarm?
Also I remember doing voltage drops and Rs, that the R of a wire does not change. The amps change which changes V.