Environmentally friendly solar technology offers significant advantages especially for the power supply of remote dwellings which are not connected to the electricity grid. This technology can be set up individually for the electrical equipment to be operated (e.g. lighting system, refrigerator, radio, TV). Larger photovoltaic systems are used more and more often to replace diesel generators, which cause heavy pollution, or instead of connection to the utility grid, which is very often quite costly. In developing countries these systems can be used in rural areas to provide electricity for the basic human needs, providing light and communication.