Stand-alone (off-grid) PV systems are independent photovoltaic systems. Typical off-grid applications are used to bring access to electricity in rural areas (remote locations, desert locations). Rural electrification means either small solar home system (covering basic electricity needs in a single household), or larger solar mini-grids, which provide enough power for several homes.
The system should be connected to a battery via a charge controller. An inverter can be used to provide AC power, enabling the use of normal electrical appliances.
An off-grid system is light and can be easily transported and installed. Its lifespan is quite long and it requires minimum maintenance, it only needs occasional inspection and cleaning.