Characteristics of a cell: IV curve

To obtain them, it is sufficient to connect a load (resistance) and make its value vary from zero to infinite. By measuring the current I and the voltage V, the curve I(V) is obtained for a defined temperature and solar irradiance.
Voc [V]: Open circuit voltage, when the charge is infinite.
Isc [A]: Short circuit current, when the charge is zero. Such as the power is given from the current multiplied by the tension, the curve P(V) is also obtained by the power in function when the charge varies from zero to infinite.
Current-tension curve I(V): As it can be observed, for a constant temperature and solar irradiance, a value of tension (and thus of charge) exists where the cell supplies maximum power. At this point, the MMP (Maximum Power Point), meaning the yield of the cell is at its maximum.