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Net metering
Computation of the power produced by a PV plant and put on in the common power grid with reference to the amount of power normally used by the final user. The term is referred in general to non-insulated PV systems, which directly put on in the common power grid.

Nickel-Cadmium battery [Ni-Cd]
Accumulator composed by plates of Nickel and Cadmium immersed in an alkaline electrolyte.

NOCT [C](Normal Operating Cell Temperature)
It's the temperature of a PV module operating with 800 W/m of radiance, 20 C of temperature and 1 m/s of wind force.

Nominal capacity [Ah]
Capacity declared by the constructor of a certain battery. The nominal capacity is referred to a discharge condition of 10 hours at the temperature of 25 C: its symbol is C10. It is measured in ampere-hour (Ah).

N-type silicon
Silicon having a crystalline structure containing impurities with negative charge.