The main image (above) shows the meteo station data (irradiance and ambient temperature) for February 2023.
The average bifacial boost is 7.60% for February 2023. 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 mono PERC (passivated emitter, rear contact) products.
The chart below 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 (tunnel-oxide passivated contact) 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 negatively-doped, 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 (maximum power point) at STC (standard test conditions) 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.
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.
Bifacial boost
| All in Wh/Wp | Total Nov. 2022 | Total Dec. 2022 | Total Jan. 2023 | Total Feb. 2023 |
|---|---|---|---|---|
| Average monthly yield | 59.40 | 88.73 | 92.10 | 70.10 |
| Average monthly bifacial yield | 61.46 | 91.39 | 95.57 | 73.10 |
| Average monthly monofacial Mono PERC yield | 58.30 | 86.71 | 89.55 | 67.93 |
| Operation days | 30 | 31 | 31 | 28 |
| Average daily yield | 1.98 | 2.86 | 2.97 | 2.50 |
| Average daily bifacial yield | 2.05 | 2.95 | 3.08 | 2.61 |
| Average daily monofacial yield | 1.94 | 2.80 | 2.89 | 2.43 |
| Bifacial boost | 5.42% | 5.40% | 6.73% | 7.60 |
Specific energy yield ranking – historical
| # | Installation month | Product | Type | Total Dec. 2022 Wh/Wp | Total Jan. 2023 Wh/Wp | Total Feb. 2023 Wh/Wp | Total March 2023 Wh/Wp | Dec. 2022 Rank | Jan. 2023 Rank | Feb. 2023 Rank | March 2023 Rank |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 37 | 01/05/2021 | LONGi LR4-72HBD-445M | Bifacial Mono PERC | 96.388 | 99.130 | 76.041 | 147.811 | 1 | 1 | 1 | 1 |
| 27 | 31/12/2019 | Jolywood JW-D72N-400 | Bifacial Mono N-TOPCon | 91.938 | 95.573 | 74.278 | 145.337 | 3 | 4 | 4 | 2 |
| 26 | 28/08/2019 | LONGi LR6-72HBD375 | Bifacial Mono PERC | 93.093 | 96.879 | 74.452 | 145.191 | 2 | 3 | 3 | 3 |
| 41 | 18/12/22 | Tongwei TH550PMB6-58SDC | Bifacial Mono PERC | / | 99.117 | 75.466 | 143.870 | / | 2 | 2 | 4 |
| 28 | 15/04/2020 | Risen RSM114-6-405BMDG | Bifacial Mono PERC | 90.466 | 93.545 | 72.269 | 140.782 | 6 | 6 | 5 | 5 |
| 38 | 20/11/2021 | LONGi LR5-72HBD-535M | Bifacial Mono PERC | 89.960 | 94.186 | 71.262 | 140.464 | 5 | 5 | 6 | 6 |
| 34* | 01/07/2021 | JA JAM72D20-445MB | Bifacial Mono PERC | 89.806 | 93.545 | 70.777 | 138.905 | 7 | 7 | 7 | 7 |
| 32 | 01/07/2021 | Risen RSM150-8-500BMDG | Bifacial Mono PERC | 88.083 | 92.619 | 70.239 | 138.846 | 12 | 8 | 8 | 8 |
| 31* | 01/10/2020 | JA JAM60S10-345/MR | Mono PERC | 90.535 | 92.506 | 70.121 | 136.008 | 4 | 9 | 9 | 9 |
| 30 | 07/07/2020 | GCL GCL-M3/72H380 | Cast Mono PERC | 88.623 | 90.520 | 69.185 | 135.559 | 10 | 12 | 10 | 10 |
| 29* | 07/07/2020 | CSI CS3U-390MS | Mono PERC | 88.700 | 90.234 | 69.027 | 134.979 | 9 | 13 | 12 | 11 |
| 35* | 01/07/2021 | JA JAM72S20-445MR | Mono PERC | 85.476 | 88.464 | 67.197 | 134.127 | 15 | 16 | 15 | 12 |
| 20 | 21/11/2018 | Phono PS380MH-24/TH | Mono PERC | 87.612 | 89.830 | 68.480 | 133.433 | 13 | 14 | 14 | 13 |
| 21 | 01/03/2019 | Risen RSM120-6-320M | Mono PERC | 89.239 | 91.322 | 69.046 | 130.769 | 8 | 10 | 11 | 14 |
| 36* | 20/11/2021 | JA JAM72S30-540MR | Mono PERC | 84.495 | 88.043 | 66.220 | 130.468 | 17 | 17 | 18 | 15 |
| 10 | 24/05/2018 | Recom RCM-275-6MB-4-BB21 | Mono | 88.285 | 90.559 | 68.753 | 121.951 | 11 | 11 | 13 | 16 |
| 23 | 04/05/2019 | Znshine ZXP6-60-275/P | Multi | 87.179 | 88.829 | 66.937 | 119.592 | 14 | 15 | 16 | 17 |
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