Photovoltaic measurement relevant to the energy yield

The principal task of photovoltaic measurement is to monitor the correct function of all components of a PV-system, as defects will result in losses in energy yield. Components are both the PV-generator and the peripheral equipment as well. Quality control of the peripheral equipment is approved by electrical measurement engineering. But quality control of the PV-generator needs in addition the measurement of the actual sunlight. Not only the irradiance, but also the spectral distribution of the irradiance has an important influence on the efficiency of the solar cell. For this reason, special sensors for irradiance-measurement with the same spectral response as the PV-modules to be measured have to be applied.