Todays A/C power measurements:
Outside temp 75F, utility power
Dometic Penguin 13,500 BTU specs 12.4A compressor, 3.5A fan 120V, 20A CB recommended.
Measure power with PI HW50C which does not display tenths and is located next to the ATS before the CB panel ie There will be additional voltage drop at the A/C input.
A/C with fan 115V 14A, fan only on high 4A.
This suggests to me that for my A/C the specs are reasonably close.
I know from past experience that the HW50C is reasonably close considering that it doesn’t display tenths.
The specs included locked rotor amps but not start up surge amps.