Grid Connected System is connected to utility grid and feeds power back into the grid. The system consists of PV panel connected to grid tie inverter. The power produced by the PV system can be either supplied to loads or fed back into grid when the PV system Output is greater than the load demand. When the PV system output is less than the load demand (e.g. at night), energy will be consumed from the utility grid. Solar grid connected system varies in size from residential to solar power stations.
Stand-alone Solar Power System or Stand-alone PV System operates independent of the electric utility grid (off-grid) and most often uses in remote areas where the utility grid is not available or where the connection fees of the grid are higher than the cost of an alternative energy system. Stand-alone Solar Power System is used to power remote home, school or village. The generated DC power needs to be stored in battery and converted to AC power for supplying to AC loads.