On-grid: the simplest and cheapest
Panels make DC power; the inverter turns it into AC for your home. Whatever the home does not use goes to MSEDCL through the net meter; at night the home takes power from the grid. In a power cut the on-grid inverter switches off on purpose, so that no power goes into the line while the lineman repairs it; there is no backup. Best for: most homes on PM Surya Ghar, with the full subsidy.