pv magazine test May 2019 results

The chart to the top right shows meteo station data (irradiance and ambient tem- perature) for May 2019. The system was offline due to a power cut from 1-3 May, and scheduled inverter maintenance from 25-29 May. Energy yield and meteo data for these days was therefore excluded.

Monthly energy yield data for the months from December 2018 to May 2019 is given in the second table below. The second chart to the right shows the total energy yield of all products for May 2019.

The bifacial boost for May 2019 aver- aged 7.7%. Bifacial boost is defined as the extra energy yield of the bifacial products compared to the average energy yield of all mono-facial products. The third chart to the right charts the energy yield boost of individual bifacial products.

The chart to the bottom right shows the comparison between different PV module technologies for May 2019. Bifacial mod- ules are steadily performing above the average energy yield level, with multi-crystalline silicon PV products perform- ing under the average energy yield level.

Notes on the yield measurements:

Energy yield is given in Wh/Wp and calculated by dividing the energy produced by the module by the Pmax at STC of the module. This Pmax is the maximum STC power after a process of stabilization. The results are grouped in categories, per module type.

The bifacial boost depends on many parameters: the bifaciality factor, the installation geometry, the albedo of the ground, and also the sun angle and dif- fuse irradiance. The ground in this case is a plastic cover simulating green grass.

George Touloupas