pv magazine test; January 2023 results


The chart above shows the meteo station data for January 2023. A new Tongwei bifacial PERC [passiavted emitter, rear contact] product has been installed. The average bifacial boost – the relative advantage of the average specific energy yield for all bifacial products, compared to all monofacial mono PERC products – is 6.73%.

The following chart shows the relative specific energy yield comparison between module technologies. While the top performer is Longi’s bifacial PERC module, the average specific energy yield of the bifacial TOPCon [tunnel-oxide passiavted contact] category leads overall, compared to the bifacial PERC solar modules.

Our test field currently has just one sample from Jolywood in the n-TOPCon [negatively-doped TOPCon] bifacial category. As TOPCon becomes more prominent, we look forward to installing more samples of this type 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.

Energy yield is given in Wh/Wp and calculated by dividing the energy produced by the module by the Pmax at STC [standard testing conditions] of the module. This Pmax is the maximum STC power after stabilization.

Results are grouped in categories, per module type.

Bifacial boost depends on many parameters: the bifaciality factor, the installation geometry, the albedo of the ground, the sun angle, and diffuse irradiance. The ground in this case is gray gravel.

Bifacial boost

All in Wh/WpTotal Oct. 2022Total Nov. 2022Total Dec. 2022Total Jan. 2023
Average monthly yield76.6659.4088.7392.10
Average monthly bifacial yield80.1261.4691.3995.57
Average monthly monofacial Mono PERC yield75.2558.3086.7189.55
Operation days31303131
Average daily yield2.471.982.862.97
Average daily bifacial yield2.582.052.953.08
Average daily monofacial yield2.431.942.802.89
Bifacial boost6.48%5.42%5.40%6.73%


Specific energy yield ranking – historical

#Installation monthProductTypeTotal
Dec. 2022 Wh/Wp
Jan. 2023 Wh/Wp
Feb. 2023 Wh/Wp
March 2023 Wh/Wp
Dec. 2022 RankJan. 2023 RankFeb. 2023 RankMarch 2023 Rank
3701/05/2021LONGi LR4-72HBD-445MBifacial Mono PERC96.38899.13076.041147.8111111
2731/12/2019Jolywood JW-D72N-400Bifacial Mono N-TOPCon91.93895.57374.278145.3373442
2628/08/2019LONGi LR6-72HBD375Bifacial Mono PERC93.09396.87974.452145.1912333
4118/12/22Tongwei TH550PMB6-58SDCBifacial Mono PERC/99.11775.466143.870/224
2815/04/2020Risen RSM114-6-405BMDGBifacial Mono PERC90.46693.54572.269140.7826655
3820/11/2021LONGi LR5-72HBD-535MBifacial Mono PERC89.96094.18671.262140.4645566
34*01/07/2021JA JAM72D20-445MBBifacial Mono PERC89.80693.54570.777138.9057777
3201/07/2021Risen RSM150-8-500BMDGBifacial Mono PERC88.08392.61970.239138.84612888
31*01/10/2020JA JAM60S10-345/MRMono PERC90.53592.50670.121136.0084999
3007/07/2020GCL GCL-M3/72H380Cast Mono PERC88.62390.52069.185135.55910121010
29*07/07/2020CSI CS3U-390MSMono PERC88.70090.23469.027134.9799131211
35*01/07/2021JA JAM72S20-445MRMono PERC85.47688.46467.197134.12715161512
2021/11/2018Phono PS380MH-24/THMono PERC87.61289.83068.480133.43313141413
2101/03/2019Risen RSM120-6-320MMono PERC89.23991.32269.046130.7698101114
36*20/11/2021JA JAM72S30-540MRMono PERC84.49588.04366.220130.46817171815
1024/05/2018Recom RCM-275-6MB-4-BB21Mono88.28590.55968.753121.95111111316
2304/05/2019Znshine ZXP6-60-275/PMulti87.17988.82966.937119.59214151617
*Purchased products from the market, which bypassed the random sampling process. All other products were provided by the suppliers.


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