1) Grid-connected solar rooftop PV system: A grid-connected solar rooftop PV system is, as the name suggests, a plant connected to the grid through net or gross metering without any battery backup. Most of the state governments and the Central government are promoting this type of rooftop system.
2) Hybrid plant: A hybrid rooftop system is similar to grid-connected solar rooftop PV, but it is installed with a battery backup. At times of power failure, the backup supplies power to the consumer, which a simple grid-connected solar rooftop system cannot do.
3) Off-grid plants: Off-grid plants are systems not connected to the grid. They are installed with a battery backup. They are considered to be expensive due to additional cost of the battery bank. They are often installed in remote areas where the grid is yet to reach or will never reach.