pv magazine test July 2019 results

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The first graph to the right charts the meteo station data for July 2019. The system was offline due to a power cut on July 1. The irradiance meters were uninstalled for calibration from July 1 to 19. Energy yield data were collected for 30 days from July 2 to July 30. Meteo data were collected for 12 days from July 20 to July 31.

Monthly energy yield data from February to July 2019 are given in the table below. The second graph to the right shows the total energy yield of all products for July 2019.

Three Znshine products, two with graphene coated glass (ZXP6-60-275/P) and one with regular glass (ZXP6-60-265/P), were added to the test from the beginning of the month. The graphene coating claims to increase the transmission properties of the glass, and also to have a self-cleaning effect, reducing O&M costs for commercial and utility-scale PV power plants.

A control test was set up for the two modules with graphene coated glass: one is cleaned weekly while the other is not cleaned at all. The module with regular glass, which is not cleaned, was installed as a reference to provide a baseline to observe the level of dust accumulation. The average energy yield of the three products is charted in the third graph to the right. The yield data of the “not cleaned” graphene coated module and the “not cleaned” regular module do not exhibit a significant difference. Thus, the self-cleaning effect of the graphene coated glass is not evident yet and needs to be further investigated as more data points are collected.

The overall bifacial boost for July 2019 averages 8.1%. Bifacial boost is defined as the extra energy yield of the bifacial products compared to the average energy yield of all mono-facial products.

The graph to the bottom right shows the comparison between different module technologies for July 2019. Bifacial modules are performing above the average energy yield level, with multi-crystalline silicon PV performing below the average energy yield level.

George Touloupas

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. 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 also the sun angle and diffuse irradiance. The ground in this case is a plastic cover simulating green grass.

Average daily and monthly yields

all in Wh/Wp

Feb 2019

Mar 2019

Apr 2019

May 2019

Jun 2019

Jul 2019

Average monthly yield

75.31

133.23

83.11

96.00

83.83

120.88

Average monthly bifacial yield

79.46

139.23

87.64

101.91

89.64

128.70

Average monthly monofacial yield

74.28

131.85

82.06

94.64

82.49

119.07

Operation days

28

31

21

25

26

30

Average daily yield

2.69

4.30

3.96

3.84

3.22

4.03

Average daily bifacial yield

2.84

4.49

4.17

4.08

3.45

4.29

Average daily monofacial yield

2.65

4.25

3.91

3.79

3.17

3.97

Bifacial boost

7.0%

5.6%

6.8%

7.7%

8.7%

8.1%

Energy yield ranking

#

Product

Type

Total Feb 2019
Wh/Wp

Total Mar 2019
Wh/Wp

Total Apr 2019
Wh/Wp

Total May 2019
Wh/Wp

Total June 2019
Wh/Wp

Total July 2019
Wh/Wp

Feb 2019 rank

Mar 2019 rank

Apr 2019 rank

May 2019 rank

Jun 2019 rank

July 2019 rank

18

LONGi LR6-60BP-300M

Bifacial Mono PERC

81.23

142.28

89.60

103.89

91.53

131.61

1

1

1

1

1

1

17

NSP D6L310L3A

Bifacial Mono PERC

78.91

138.37

86.84

101.05

89.09

127.61

2

2

2

2

2

2

1

Jolywood JW-D60N-305

Bifacial N-PERT

78.22

137.05

86.47

100.80

88.31

126.88

3

3

3

3

3

3

16

LONGi LR6-60PE-310M 2

Mono PERC

76.43

135.64

84.47

97.70

85.24

123.17

4

4

4

4

4

4

7

LONGi LR6-60PE-310M 1

Mono PERC

75.79

134.69

83.86

97.12

84.16

121.70

5

5

5

5

5

5

21

Risen RSM120-6-320M

Mono PERC

131.52

82.20

95.35

83.67

120.49

12

8

6

6

6

20

Phono PS380MH-24/TH

Mono PERC

74.38

132.18

82.29

94.39

83.26

120.27

10

6

6

10

7

7

10

Recom RCM-275-6MB-4-BB21

Mono

74.62

131.72

81.94

94.90

82.75

119.59

6

9

10

8

9

8

14

Sample 2

Mono PERC

74.50

132.00

82.22

95.23

82.87

119.14

8

7

7

7

8

9

2

Phono MWT-60-280

Multi MWT

72.64

131.19

81.64

94.42

81.90

118.85

14

13

13

9

11

10

8

Aiduo AD280-60S

Mono

74.18

131.71

81.93

93.90

82.17

118.75

11

10

11

14

10

11

3

Risen RSM60-6-270P

Multi

72.61

131.11

81.46

94.12

81.62

118.13

15

14

14

11

13

12

4

Perlight PLM-300M-60

Mono PERC

74.48

131.60

81.95

93.92

81.66

117.17

9

11

9

13

12

13

12

NSP D6LM305E3A

Mono PERC

74.54

131.73

81.84

94.04

81.46

117.07

7

8

12

12

14

14

9

Aiduo AD265-60P

Multi

73.55

130.36

81.19

92.88

80.61

116.92

13

15

15

15

16

15

13

Sample 1

Mono

73.62

128.56

79.79

92.30

80.99

116.72

12

16

16

16

15

16