There are two types of Photovoltaic power systems, grid-connected or utility-interactive systems (also known as stand-alone systems).
- Grid-connected PV systems are designed to work in parallel and interconnected with the national electric utility grid. The inverter, which changes the current from DC to AC, is the main component in a grid-connected PV system.
- Stand-alone PV systems are designed to operate independently from the national electric utility grid. These types of systems are powered either by a PV array or an auxiliary power source, such as wind, an engine-generator or utility power (a PV-hybrid system).