These charts seem to take into account voltage loss only and not ampacity. For a 2000 wattt inverter, the charts recommend 2 AWG or smaller wire for shorter runs, but with the 155 amps an inverter could pull at these wattages, 2 AWG is not rated for this.
If the inverter goes to a low voltage cutoff of 10 volts, the same wire could see 200 amps of current, making these recommendations way to small.
In my Experience, inverter runs are so short that usually voltage loss is not as much of a problem, if at all, compared to making sure not to exceed wire ampacity.
