pv magazine test: July 2022 results


Figure 1 (below) charts the meteo station data (irradiance and ambient temperature) for July 2022. The testing facility experienced a power cut from July 15-19. The average bifacial boost is 10.53%. 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 PERC products.

Figure 3 (below) shows the relative specific energy yield comparison between different solar 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.

Our test field only has one sample from Jolywood in the n-TOPCon bifacial category. As TOPCon modules become more prominent, we look forward to installing more samples for 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 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 Apr 2022Total May 2022Total June 2022Total July 2022
Average monthly yield135.23155.23154.20137.548
Average monthly bifacial yield145.65166.49168.17149.248
Average monthly monofacial Mono PERC yield131.29152.59151.37135.031
Operation days30312826
Average daily yield4.515.015.515.290
Average daily bifacial yield4.865.376.015.740
Average daily monofacial yield4.384.925.415.193
Bifacial boost10.9%9.11%11.10%10.53%
Specific energy yield ranking – historical
#Installation MonthProductTypeTotalApr2022 Wh/WpTotal May2022 Wh/WpTotal June2022 Wh/WpTotal July2022 Wh/WpApr 2022 RankMay 2022 RankJune 2022 RankJuly 2022 Rank
268/28/2019LONGi LR6-72HBD385Bifacial Mono PERC150.162171.16684172.43214153.928551131
2712/31/2019Jolywood JW-D72N-400Bifacial Mono N-TOPCon148.735170.92764173.22038153.573743222
375/1/2021LONGi LR4-72HBD-445MBifacial Mono PERC149.532170.71304173.31933153.487042313
3811/20/2021LONGi LR5-72HBD-535MBifacial Mono PERC143.655164.3878166.20594147.720685544
284/15/2020Risen RSM114-6-405BMDGBifacial Mono PERC143.790164.6408165.75472147.623844455
34*7/1/2021JA JAM72D20-445MBBifacial Mono PERC142.766162.82478163.81629145.655886666
327/1/2021Risen RSM150-8-500BMDGBifacial Mono PERC140.941160.7569162.45779142.747297777
29*7/7/2020CSI CS3U-390MSMono PERC136.226155.48622156.05588139.6634912888
307/7/2020GCL GCL-M3/72H380Cast Mono PERC136.622155.45889155.92979139.630989999
31*10/1/2020JA JAM60S10-345/MRMono PERC136.539155.18962153.82776138.0271410111110
35*7/1/2021JA JAM72S20-445MRMono PERC136.389155.35231155.60442136.933311101011
2011/21/2018Phono PS380MH-24/THMono PERC139.528154.79687152.0009136.345298121312
40*11/20/2021Trina TSM-505DE18M(II)Mono PERC133.449151.85355152.29831135.5204414141213
36*11/20/2021JA JAM72S30-540MRMono PERC134.024152.02315151.41149133.7799113131414
33*7/1/2021Trina TSM-450DE173(II)Mono PERC132.261150.62826150.58226133.4588115151515
213/1/2019Risen RSM120-6-320MMono PERC127.453142.5313134.6321121.9162216161616
105/24/2018Recom RCM-275-6MB-4-BB21Mono117.631128.12397118.99804108.2207517171717
235/4/2019Znshine ZXP6-60-275/P (no cleaning)Multi115.167126.77549116.64069107.2322518181818
*Purchased products from the market, which bypassed the random sampling process. All other products were provided by the suppliers.

Test cooperation

pv magazine test is a cooperative effort involving pv magazine, APsystems, 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.

By George Touloupas

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