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There are different types of PV systems:

 PV direct system: This is the simplest type of PV system. Because they do not use batteries and not tied up to the grid, they power the load only when the sun is shining.

 Off-grid system: This is also called as stand-alone systems which is independent of the power grid. When the sun is not available, batteries are used to store energy.

 Grid connected system: Here solar PV systems are tied with grids so that the excess required power can be accessed from the grid. They may or may not be backed up by batteries.