Re: power inverter
It may have a converter/inverter and if so it will also be the source of 12V-dc power when connected to shore power and the device that charges the batteries. If you look on it, the name and model will tell someone here what it is. That is the most common way to install an inverter, especially if the motorhome came from the factory with one.
Another hint is the number of coach batteries that you have. Most RVs with an inverter will have four or more batteries.