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The first chart to the right shows the meteo station data (irradiance and ambient temperature) for October 2020. A new mono PERC, monofacial module from JA Solar (JAM60S10-345/MR) was added to the outdoor test array at the beginning of October. After operating for approximately a full month, its energy yield performance was added to this month’s results.

Beginning this month, the energy yield comparison between technologies, including bifacial boost, will be analyzed using products installed after the beginning of 2019. This is to eliminate the influence of the performance degradation from the older modules on the results. Using this new approach, the average bifacial boost is 6.0% for October 2020. Bifacial boost is defined as the extra energy yield of the bifacial products compared to the average energy yield of all mono-facial mono PERC products.

The chart to the bottom right shows the comparison between different PV module technologies for October 2020. Cast mono PERC is categorized as a “standard multi” product for this comparison. Bifacial modules are steadily performing above all the other technologies, with multi-crystalline silicon PV having the lowest yield.

Notes on the energy yield measurements:

  • 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.

George Touloupas 

We are pleased to present the next batch of energy yield results from the outdoor test field in Xi’an, China. In this edition, we present the October 2020 results, alongside analysis from George Touloupas, director of technology and quality at CEA.

Test cooperation

pv magazine test is a cooperative effort involving pv magazine, CEA and Gsolar. 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.

Bifacial boost
all in Wh/WpTotal Jul 2020Total Aug 2020Total Sep 2020Total Oct 2020
Average monthly yield83.52107.57103.0764.13
Average monthly bifacial yield88.57112.96107.6566.63
Average monthly monofacial Mono PERC yield81.74105.39101.2662.83
Operation days25302731
Average daily yield3.343.593.822.07
Average daily bifacial yield3.543.773.992.15
Average daily monofacial yield3.273.513.752.03
Bifacial boost8.4%7.2%6.3%6.0%
Energy yield ranking
Jul 2020 Wh/Wp
Aug 2020 Wh/Wp
Sep 2020 Wh/Wp
Oct 2020 Wh/Wp
July 2020 rankAug 2020 rankSep 2020 rankOct 2020 Rank
18LONGi LR6-60BP-300MBifacial Mono PERC91.21116.40111.0069.961221
26LONGi LR6-72HBD375Bifacial Mono PERC91.07116.50111.1868.722112
17NSP D6L310L3ABifacial Mono PERC88.02112.19107.1667.905543
1Jolywood JW-D60N-305Bifacial N-PERT88.18112.27106.8067.144454
27JW-D72N-400Bifacial Mono N-TOPCon88.75113.05107.4266.773335
16LONGi LR6-60PE-310M 2Mono PERC83.84108.00103.8565.277666
28Risen RSM114-6-405BMDGBifacial Mono PERC84.19107.34102.3864.416787
20Phono PS380MH-24/THMono PERC82.76106.64102.5064.188878
14Sample 2Mono PERC81.97105.44101.4863.921112129
21Risen RSM120-6-320MMono PERC82.26106.09101.8163.8710111110
10Recom RCM-275-6MB-4-BB21Mono82.41106.09101.8463.709101011
8Aiduo AD280-60SMono81.50104.91100.9063.3514141312
9Aiduo AD265-60PMulti81.60105.09100.7463.2813131413
22Znshine ZXP6-60-275/PMulti81.06104.1799.9262.9915161714
31JA JAM60S10-345/MRMono PERC62.6015
2Phono MWT-60-280Multi MWT80.76104.17100.2062.5916151516
3Risen RSM60-6-270PMulti80.63103.9699.9962.5417171617
12NSP D6LM305E3AMono PERC79.96102.7098.5462.1518181818
29CSI CS3U-390MSMono PERC81.67106.54102.2562.04129919
4Perlight PLM-300M-60Mono PERC79.73102.3398.3661.8419191920
30Sample 3Cast Mono PERC78.9061.642021

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