Check all GFCI outlets to make sure they have not tripped. If one trips it can affect the entire circuit depending on how circuit is wired. GFCI breakers and outlets go bad from time to time so you may want to make sure one hasn't failed.
My RV has a very small micro switch on a breaker associated with the inverter. If I lose 110 power it is the first thing I check. Often the breaker trips when there is a heavy load even if I'm plugged into shore power.
Also on several occasions I have had to clean and re-do the wire nuts for the wires connected to my inverter/converter from shore power. It seems they may vibrate loose over time or become corroded.