LouKrasz wrote:
If I use a step-down transformer that steps 220 volts to 110 volts from a panel with two 15 amp breakers,
NO! NO! NO! the Circuit breaker panel does this for you.
1. The circuit breaker for the A/C is (may be) 20 amp 110 volts. Do not change this because you can cause the wires from the circuit breaker to the A/C to melt and catch fire.
2. The plug for a 50 Amp RV has 4 wires. , ,
Photo of 50 Amp plug , , , Between the two outside pins you have 220 volts which is not used in he RV. The circuit breaker in effect splits the 220 into two legs each of 110 volts.
3. Thus you already have two 110 volts circuits so you can run TWO 20 amp A/C.