My cable run is may be four feet. I probably didn't need 4/0 cable but I was down to days before departing for two weeks on vacation to get the fridge working off the inverter and could risk a third configuration.
Run time of a roof A/C off batteries, even lithium, is problematic and your time on the inverter is not going to be very long even with a 13.5 BTU roof A/C. Run the energy number see how long the system will support the A/C and don't forget to include maybe as much as a 10% penalty for system losses.
And the the Wynns, who by the way no longer RV, are probably better at advising wine to food pairing then concerning the care and feeding of an RV. Not understanding just how high the surge load of an A/C compressor is against the capacity of the inverter is just the first example.
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2006 Hurricane 31D built on a 2006 Ford F53
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