For the sake of terminology, an inverter and a converter are two different things. An inverter converts 110v to 12v
appliances, TVs, shaver etc. A converter accepts the 30amp (or less) electrical power from the camp ground, your generator, your house etc....and supplies your 110v appliances, lights etc with power. It also supplies power to your 12v
panel...which then powers 12v outlets, probably the control panel on your fridge...and most importantly, charges your batteries.
Start by checking your circuit breakers in your breaker box... Are they all on? Flip them to full off...then back to full on.
Let us know what happens.