On-Grid Systems are systems that requires
grid connection, where energy can flow two
ways. Permanently grid-connected with own
consumption plants draw power from the grid
during the hours when the PV generator cannot
produce the energy necessary to satisfy the
needs of the consumer. On the contrary, if the
PV system produces excess electric power, the
surplus is put into the grid, which therefore can
operate as a big accumulator: as a
consequence, grid-connected systems do not
need accumulator banks.
Off-grid plants are plants which are not
connected to the grid and consist of PV
modules and of a storage system which
guarantees electric energy supply also when
lighting is poor or when it is dark. Since the
current delivered by the PV generator is DC
power, if the user plant needs AC current an
inverter becomes necessary.
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