It depends on the 13.5k BTU AC. Some are low power and typically draw 10 amps. The one on our 2001 draws 15. It can start if the fan is on low, and the batteries are fully charged so the converter isn't drawing any power, but both the generator and AC struggle, meaning a shorter life for both generator and AC compressor. That's why we run two EU2000s in parallel
. We also got them from Mayberrys.