pv magazine test – September 2022 results


The first chart, above, shows the meteo station data (irradiance and ambient temperature) for September 2022. The average bifacial boost is 7.97%. 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 mono-facial mono PERC products.

The chart to the left shows the relative specific energy yield comparison between different PV module technologies. Although the top performer is Longi’s bifacial PERC module, the average specific energy yield of the bifacial TOPCon category leads over the average specific energy yield of modules in the bifacial PERC category.

The test field currently has just one sample from Jolywood in the n-TOPCon bifacial category. As TOPCon modules become more prominent, we look forward to installing more samples of this type to achieve a more representative yield comparison.

Energy yield measurements

  • The energy yield comparison among various technologies, including bifacial boost, will be 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 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 the sun angle and diffuse irradiance. The ground in this case is gray gravel.


Bifacial boost

All in Wh/WpTotal July 2022Total Aug. 2022Total Sept. 2022Total Oct. 2022
Average monthly yield137.53128.72109.3576.66
Average monthly bifacial yield149.25139.88116.2080.12
Average monthly monofacial Mono PERC yield135.03125.82107.6275.25
Operation days26313031
Average daily yield5.294.153.652.47
Average daily bifacial yield5.744.513.872.58
Average daily monofacial yield5.194.063.592.43
Bifacial boost10.53%11.17%7.97%6.48%


Specific energy yield ranking – historical

#Installation monthProductTypeTotal
July 2022 Wh/Wp
Aug. 2022 Wh/Wp
Sept. 2022 Wh/Wp
Oct. 2022 Wh/Wp
July 2022 RankAugust 2022 RankSept. 2022 RankOct. 2022 Rank
3701/05/2021LONGi LR4-72HBD-445MBifacial Mono PERC153.487143.509119.40982.7733311
2628/08/2019LONGi LR6-72HBD375Bifacial Mono PERC153.929143.915119.11082.0541122
2731/12/2019Jolywood JW-D72N-400Bifacial Mono N-TOPCon153.574143.548118.94481.8722233
2815/04/2020Risen RSM114-6-405BMDGBifacial Mono PERC147.624137.974114.91479.5195554
3820/11/2021LONGi LR5-72HBD-535MBifacial Mono PERC147.721137.379114.94378.9514445
34*01/07/2021JA JAM72D20-445MBBifacial Mono PERC145.656135.082113.65078.1496766
31*01/10/2020JA JAM60S10-345/MRMono PERC138.027129.848109.91977.5241010107
3201/07/2021Risen RSM150-8-500BMDGBifacial Mono PERC142.747136.052112.41377.1427678
29*07/07/2020CSI CS3U-390MSMono PERC139.663131.246110.28877.0868889
3007/07/2020GCL GCL-M3/72H380Cast Mono PERC139.631131.025110.17976.97799910
35*01/07/2021JA JAM72S20-445MRMono PERC136.933125.579109.43075.57011131111
2021/11/2018Phono PS380MH-24/THMono PERC136.345128.141107.75475.37312111212
2101/03/2019Risen RSM120-6-320MMono PERC121.916114.944101.89674.32316161613
36*20/11/2021JA JAM72S30-540MRMono PERC133.780120.753106.56473.78814151414
40*20/11/2021Trina TSM-505DE18M(II)Mono PERC135.520125.670106.72873.66613121315
33*01/07/2021Trina TSM-450DE173(II)Mono PERC133.459122.415105.83373.30015141516
1024/05/2018Recom RCM-275-6MB-4-BB21Mono108.221102.93993.50571.23017171717
2304/05/2019Znshine ZXP6-60-275/PMulti107.232102.46992.48770.51918181818
*Purchased products from the market, which bypassed the random sampling process. All other products were provided by the suppliers.

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