An inverter's job is to convert the given 12/24v dc supply into 120/240v at 60/50Hz AC power supply, and in an RV, it does the same. It takes input from RV batteries connected with solar panel and gives an AC supply to use for electric gadget and appliances, that might be a coffee maker, microwave, or even a TV. Remember to switch off the inverter of your RV when not using the AC supply because you would never want your car battery down, especially when it is an RV.