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.