In the autonomous photovoltaic system, the energy generated from the PV panels, is being stored in accumulators (batteries) for use when the sun is not shining. A charge regulator regulator protects the batteries from being overcharged or from deep discharge. For the use of electric appliances with AC current (230 VAC/50 Hz) the system needs an inverter.Stand-alone systems are particularly suitable for homes or other applications which are very remote and where the cost of running new electric lines is prohibitive