pv magazine test: August 2023 results


This month, new products have been added to our testing program, with many using new technology such as tunnel oxide passivated contact (TOPCon), back contact, or heterojunction (HJT) cells. Results from two new TOPCon products from Tongwei have been included in the outdoor test for the first time this month. TOPCon products from Astronergy and HY Solar have finished indoor testing and the test results will soon be available on the pv magazine website.

The chart in the main image, above, shows the meteo station data (irradiance and ambient temperature) for August 2023. Unfortunately, two power cuts occurred in August and with the loss of two days of meteo station data, only 23 days of power generation data is available.

The average bifacial boost is 10.2% for August 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 products.

Bifacial boost

All in Wh/WpTotal May 2023Total June 2023Total July 2023Total August 2023
Average monthly yield110.91124.06124.66133.43
Average monthly bifacial yield118.14133.34134.30142.29
Average monthly monofacial Mono PERC yield108.02119.80120.42129.12
Operation days31262923
Average daily yield3.584.774.055.80
Average daily bifacial yield3.815.134.396.19
Average daily monofacial yield3.484.613.905.61
Bifacial boost9.37%11.3%11.01%10.20%


Specific energy yield ranking of bifacial modules – historical

#Installation monthProductTypeSample selection methodTotal
May 2023 Wh/Wp
June 2023 Wh/Wp
July 2023 Wh/Wp
August 2023 Wh/Wp
May 2023 RankJune 2023 RankJuly 2023 RankAugust 2023 Rank
372021/5/1LONGi LR4-72HBD-445MBifacial PERC3122.79137.06137.27146.601221
422023/6/5DAS-DH144NA-570Bifacial N-TOPCon3/138.07139.49146.49/112
272019/12/31Jolywood JW-D72N-400Bifacial N-TOPCon3121.65136.78136.84145.782333
262019/8/28LONGi LR6-72HBD375Bifacial PERC1120.83136.22136.22145.673444
432023/6/23Tongwei TWMND-72HD565Bifacial N-TOPCon3///143.57///5
412022/12/18Tongwei TH550PMB6-58SDCBifacial PERC1119.19133.10134.44140.754556
282020/4/15Risen RSM114-6-405BMDGBifacial PERC3116.82130.86130.56139.895777
382021/11/20LONGi LR5-72HBD-535MBifacial PERC3115.72130.89131.15139.656668
342021/7/1JA JAM72D20-445MBBifacial PERC2113.99128.60128.72137.368889
322021/7/1Risen RSM150-8-500BMDGBifacial PERC1114.11128.48128.76137.1379910


Specific energy yield ranking of monofacial modules – historical

#Installation monthProductTypeSample selection methodTotal
June 2023 Wh/Wp
July 2023 Wh/Wp
Aug. 2023 Wh/Wp
Sep. 2023 Wh/Wp
June 2023 RankJuly 2023 RankAug. 2023 RankSep. 2023 Rank
442023/9/1AIKO A600-MAF72MwN-back contact3///104.79///1
302020/7/7GCL GCL-M3/72H380Cast PERC1123.00123.20133.26102.232212
292020/7/7CSI CS3U-390MSPERC2123.32123.44132.83102.121123
312020/10/1JA JAM60S10-345/MRPERC2122.23121.70131.09101.574444
352021/7/1JA JAM72S20-445MRPERC2122.62122.85131.80101.133335
202018/11/21Phono PS380MH-24/THPERC1120.47120.72130.80100.395556
362021/11/20JA JAM72S30-540MRPERC2119.12119.41127.1397.986667
212019/3/1Risen RSM120-6-320MPERC1107.81106.27116.9689.547778
102018/5/24Recom RCM-275-6MB-4-BB21Mono198.6596.20105.3686.058889
222019/5/4Znshine ZXP6-60-275/PMulti195.8293.70102.9584.9299910
Note: Explanation of sample selection method categorization: 1 Sample randomly selected by CEA from a large production lot; 2 Sample purchased from the market by CEA; 3 Sample provided by supplier, without random selection.


Notes on the 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 of panel generation capacity and calculated by dividing the energy produced by the module by the maximum power point (Pmax) at standard testing 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: bifaciality factor, installation geometry, ground albedo, and the sun angle and diffuse irradiance. The ground, in this case, is grey gravel.

Test co-operation

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.

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