pv magazine test: Latest results

From August pv magazine

We are happy to present the next batch of energy yield results from the outdoor test field in Xi’an, China. The June 2019 results are presented below, plus additional analysis from George Touloupas, director of technology and quality at CEA.

The first graph (below) right charts the meteo station data (irradiance and ambient temperature) for June 2019. The system was offline due to power cuts on June 1, 2, 29 and 30. The irradiance meters were taken down for calibration from June 19 to 30. Energy yield data was collected for 26 days from June 3 to June 28. Meteo data was collected from June 3 to June 18.

The monthly energy yield data for the months from January to June 2019 is given in the first table at the end of the text, while the second chart (below) shows the total energy yield of all products for June 2019.

Bifacial boost

The overall bifacial boost for June 2019 averaged out to 8.7%. Bifacial boost is defined as the extra energy yield of the bifacial products compared to the average energy yield of all other mono-facial products. Bifacial boost is calculated every day for each bifacial product. The third graph charts the 26-day average energy yield boost of individual bifacial products.

Notes on the yield measurements

The energy yield is given in Wh/Wp and was 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.

By George Touloupas

Visit the pv magazine test about and results pages for further information.

Average daily and monthly yields
all in Wh/Wp	Jan 2019	Feb 2019	Mar 2019	Apr 2019	May 2019	Jun 2019
Average monthly yield	65.12	75.31	133.23	83.11	96.00	83.83
Average monthly bifacial yield	67.00	79.46	139.23	87.64	101.91	89.64
Average monthly monofacial yield	64.64	74.28	131.85	82.06	94.64	82.49
Operation days	31	28	31	21	25	26
Average daily yield	2.10	2.69	4.30	3.96	3.84	3.22
Average daily bifacial yield	2.16	2.84	4.49	4.17	4.08	3.45
Average daily monofacial yield	2.09	2.65	4.25	3.91	3.79	3.17
Bifacial boost	3.7%	7.0%	5.6%	6.8%	7.7%	8.7%

Energy yield ranking
#	Product	Type	Total Jan 2019 Wh/Wp	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	Jan 2019 rank	Feb 2019 rank	Mar 2019 rank	Apr 2019 rank	May 2019 rank	Jun 2019 rank
18	LONGi LR6-60BP-300M	Bifacial Mono PERC	68.07	81.23	142.28	89.60	103.89	91.53	1	1	1	1	1	1
17	NSP D6L310L3A	Bifacial Mono PERC	66.96	78.91	138.37	86.84	101.05	89.09	2	2	2	2	2	2
1	Jolywood JW-D60N-305	Bifacial N-PERT	65.98	78.22	137.05	86.47	100.80	88.31	4	3	3	3	3	3
16	LONGi LR6-60PE-310M 2	Mono PERC	66.40	76.43	135.64	84.47	97.70	85.24	3	4	4	4	4	4
7	LONGi LR6-60PE-310M 1	Mono PERC	65.58	75.79	134.69	83.86	97.12	84.16	5	5	5	5	5	5
21	Risen RSM120-6-320M	Mono PERC	–	–	131.52	82.20	95.35	83.67	–	–	12	8	6	6
20	Phono PS380MH-24/TH	Mono PERC	64.66	74.38	132.18	82.29	94.39	83.26	11	10	6	6	10	7
14	Sample 2	Mono PERC	64.79	74.50	132.00	82.22	95.23	82.87	8	8	7	7	7	8
10	Recom RCM-275-6MB-4-BB21	Mono	65.06	74.62	131.72	81.94	94.90	82.75	7	6	9	10	8	9
8	Aiduo AD280-60S	Mono	64.69	74.18	131.71	81.93	93.90	82.17	10	11	10	11	14	10
2	Phono MWT-60-280	Multi MWT	62.76	72.64	131.19	81.64	94.42	81.90	15	14	13	13	9	11
4	Perlight PLM-300M-60	Mono PERC	65.15	74.48	131.60	81.95	93.92	81.66	6	9	11	9	13	12
3	Risen RSM60-6-270P	Multi	64.02	72.61	131.11	81.46	94.12	81.62	13	15	14	14	11	13
12	NSP D6LM305E3A	Mono PERC	63.79	74.54	131.73	81.84	94.04	81.46	14	7	8	12	12	14
13	Sample 1	Mono	64.76	73.62	128.56	79.79	92.30	80.99	9	12	16	16	16	15
9	Aiduo AD265-60P	Multi	64.06	73.55	130.36	81.19	92.88	80.61	12	13	15	15	15	16

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.

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