The difference between a 11k and 13.5k amp draw is about 2 amps.
The OTHER problem is this. That outlet you are plugging into is usually NOT the only plug in your house on that circuit. You may have other items in your house plugged into wall outlets that are on that circuit. VERY FEW Home wall outlets will have a 20 amp breaker, most are 15 amp. You need to verify this,. Using a heavy Extension cord helps but people forget the WEAKEST link in this is the adapter from the RV to the 15 amp adapter. THIS IS A 15 AMP ADAPTER, NOT A 20 AMP ADAPTER. That means ITS rated at 15 amps max. The wall receptacle, is also rated AT 15 AMPS not 20 or 30. When you plug into at Shore current, the AC is NOT the only thing ON in your RV. You have a Power Converter pulling current also, but usually 1 to 2 amps. LOW voltage will NOT trip a Circuit Breaker(VERY common misconception about this on this type thread). LOW voltage will indeed ruin a Compressor or fan motor.
Since you are a novice, the best advice is to NOT do what you want to do without having a true 30 amp service connected at your house. Remember, the MINIMUM rated current IN the RV for a RV roof AC is a 20 amp breaker, NOT a 15 amp breaker. Doug
