Hi,
I was at a private home, not a campground. I'm no longer there so I can't get a "reading" at the outdoor 15 amp wall circuit. I can say that at 5:30 a.m. voltage inside the RV with no load (other than a kill-a-watt meter) was 124.4 volts.
Connection to shore power was a 15 foot #12, a 15 to 30 amp "dog bone" and 25 feet of #10.
I moved to the generator from shore power at 2:30 p.m. local time and wattage dropped down to 1630 from over 1900 on shore power. Voltage from the Yamaha 3000 iSEB in eco mode was 121.9 with the air conditioner running.
I turned off the air and genny as I was not going to be in the RV for some hours.
At 6:45 p.m., I started the genny in full power mode, waiting 3 minutes, turned the air conditioner on, and then moved to eco mode. There was no question of the air conditioner cycling as the inside of the RV at that point in time was 37 C. Out of doors the temperature was 41 C.
We went out for supper.
Two hours later the interior of the RV was at 24 C.
I moved back to shore power. Voltage while running the air conditioner was 113 and wattage was around about 1330.
My plans this summer include abandoning the #12 cords and making up 50, 75, and 100 foot #10 extensions, to get away from the "daisy chain" I use now.