Grid-tied (sometimes referred to as on-grid) PV systems are simply
those that are connected/tied to an electricity grid. A reliable grid (aka 24/7
electricity) is great for solar as no backup systems are required (generators
or energy storage). Moreover, a reliable grid ensures that excess energy needs
are met from the grid and excess solar PV generation is fed into the grid.
Although representing 95% of all PV systems installed worldwide,
grid-tied systems can hardly be feasible in countries such as Lebanon that
experience frequent blackouts.