Rhonda, inverters take your battery voltage up to 120v for household appliances when you are not hooked up to shore power. We typically see these installed in vans and other smaller campers that will be off-grid most of the time.
But I suspect by 'not charging' you mean the battery charger, or shore power converter, or an all-in-one inverter/charger unit which would mean you probably are in an RV such as a motorhome or travel trailer.
If you can, take a picture of the unit and post it here, or, if you can read a brand name and model number, I bet we can figure out what you have and what we can help you with.