pv magazine test: November and December 2024 Results
By George Touloupas
This article was originally published in pv magazine – February 2025 edition. Learn more about the pv magazine test here.
George Touloupas, senior director of technology and quality at Clean Energy Associates, presents the November and December 2024 results from the pv magazine test site in Xi’an, China. These are the final results from this installation, as we prepare to launch a brand new pv magazine test program for 2025 – the full details will appear in next month’s edition.
Due to system downtime, 12 days of data have been excluded. The chart below shows the meteo station data (irradiance and ambient temperature) for November and December 2024.
Figure 1: Daily temperature and irradiance data - November and December 2024
The average bifacial boost was 5.91% for November and December 2024, in total. Bifacial boost is defined as the relative advantage of the average specific energy yield of all bifacial products compared to the average specific energy yield of all monofacial passivated emitter, rear cell (PERC) products.
Table 1: Bifacial boost - August 2024 to November and December 2024
Table 2: Specific energy yield ranking of negatively doped, n-type bifacial tunnel oxide passivated contact (TOPCon) and HJT modules - November and December 2024
Table 3: Specific energy-yield ranking of bifacial PERC modules - November and December 2024
Table 4: Specific energy-yield ranking of monofacial modules - November and December 2024
Notes on the energy yield measurements:
The energy yield comparison among various technologies, including bifacial boost, is analyzed using products installed after the beginning of 2019.
The energy yield is given in Wh/Wp and calculated by dividing the energy produced by the module by the maximum power output (Pmax) at standard test conditions (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 the sun angle and diffuse irradiance. The ground, in this case, is gray gravel.
Figure 2: Specific energy yield of n-type bifacial (TOPCon and HJT), bifacial PERC, and monofacial modules - November and December 2024
Figure 3: Relative yield of different technologies - November and December 2024
Test cooperation
pv magazine test is a cooperative effort involving pv magazine, CEA, Gsolar and Hoymiles. All testing procedures are carried out at Gsolar’s test laboratory in Xi’an, China. CEA supervises these tests and designed both the indoor and outdoor testing procedures.
