Fraunhofer ISE’s Freiburg, Germany-based PV Module CalLab has revealed that it has increased the accuracy of its precision measurements on solar PV modules to ±1.8% from ±2%, thereby improving the reliability and calculation certainty of a module’s efficiency. The new value was determined in accordance with IEC 60904-1, with the spectral mismatch correction determined according to IEC 60904-3.

The CalLab, or calibration laboratory, is one of the most esteemed calibration laboratories worldwide, having been active in the field for over 25 years. The laboratory calibrates reference modules for production lines and conducts module power spot checks in accordance with international standards. Measurements taken on these checks include the current-voltage curves, electrical characteristics measured under standard test conditions (1000W/m2, 25°C and AM1.5).

“With this value, CalLab PV Modules at Fraunhofer ISE offers manufacturers a reference with which they can even more precisely determine the power output of their PV modules,” commented Klaus Kiefer, head of the Quality Assurance PV Modules and Power Plants department. “For a production volume of 2GW, a power deviation of one percent corresponds to a monetary value of about €14 million. On the side of the investors, a high degree of certainty is demanded in calculating risk premiums and in the overall calculation for PV power plants.”