An RV inverter can be a lifesaver when you're away from other sources of power in your RV. An inverter works by turning 12 Volt power from your RV's engine battery (or a bank of batteries) into 120 Volt AC power that will run most of the appliances and plugs in your RV. That means that even if your campsite doesn't have hookups or you don't own a generator, you can still enjoy AC power when you camp.
An RV inverter/charger combination ensures that you won't run your battery down, because it creates DC power to charge your battery when you have access to hookups or a generator. An inverter is very handy to have in case of electrical emergencies, or in case you camp where there are no hookups and you don't want the noise or exhaust of a generator. You can get inverters in various sizes, from small pocket models that will power a small game to large models that can power most of the electrical needs inside your RV.