f491b208_SolarWorld___Solar_glossary__o_called_stand_alone_systems__
[Off-grid] Profitability
a solar power system's profitability is calculated based on the system's costs, feed-in tariffs and solar incidence at its location. On average, a south-facing system with a roof pitch of 30° pays for itself over 12 to 14 years.
SolarWorld : Solar glossary
solar power systems which are not connected to an electricity network. The electricity produced is consumed or stored directly on site (so-called stand-alone systems).