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[Off-grid] Sustainability
1. the capacity to endure; refers to a system which lasts a long time; 2. scientific concept regarding objective limits to exploiting the environment; 3. ethical-normative concept, the core of which is the issue of fairness and balance.
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).