Principle


The current-voltage-curve of a solar cell describes its
behaviour under load. The output power of a solar cell is at
maximum when its internal resistance is identical to the external
resistance.In order to record the characteristic curve, a
resistance decade is connected
to the solar cell. The resistance decade has 12 switch positions
with different resistance levels (also short-circuit and open). The
values of these resistances have been selected in a manner that
ensures that the course of the characteristic curve can be
optimally represented. Voltage, current, and power are measured
with the aid of the Cobra4 Sensor-Unit Energy.