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A photovoltaic system turns the light emitted by the sun into useful power. It consists of the solar array and the other system components. Grid-tied vs Hybrid systems, residential vs. commercial systems, distributed vs. centralized systems, rooftop vs. ground-mounted systems, systems are some of the differences between PV systems. Other comparisons may include microinverter systems versus central inverter systems, crystalline silicon systems versus thin-film technology, and module systems.

PV systems range in size from tiny rooftop-mounted to large solar farms covering hectares with from a few kiloWatts (kW) (1000 Watt) to GigaWatt (GW) (1 000 000 000 Watt) capacity.Most PV systems are now grid-connected, with off-grid or stand-alone systems accounting for a tiny percentage of the market.

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