Yes, an inverter is typically required with solar panels. Solar panels generate direct current (DC) electricity, which cannot be used directly by most household appliances and devices that require alternating current (AC) electricity. An inverter is used to convert the DC electricity generated by the solar panels into AC electricity that can be used by household appliances and devices. The inverter also acts as a central control system for the solar panel system, managing the flow of electricity from the panels to the battery bank and the grid, if the system is connected to one. Some inverters also have built-in monitoring systems that can provide information on the performance of the solar panel system, such as the amount of electricity generated and the battery's state of charge.