Off Grid solar system: System like these are the ones where the energy generated is solely used by the consumer and/or stored in energy storage device for future use. This system has no connection with the grid. Such system is costlier that the on grid system, but it is effective in the places where there is no grid or the quality of grid available is not good.
More info: https://www.futuregreenbattery.com/general-solar-energy-system_nc6.