The addition of an inverter allows this system to convert DC electrical current coming from the batteries into AC or alternating current.

AC is the standard form of electricity for anything that “plugs in” to utility power and is the appropriate current for common household appliances.

While AC off-grid solar power systems are more expensive because of the cost of the inverter, the appliances you are able to use are less expensive and there are more kinds of appliances to choose from.