JA Solar has published data comparing its own modules, based on the 182mm wafer format, with others using the larger 210mm size over a six-month period in field trials. Data shows that the smaller of the two sizes achieved an average daily energy yield nearly 2% higher. According to JA Solar’s analysis, the higher currents produced by the 210mm modules resulted in higher resistance and more energy wasted as heat.
The introduction of new insert sizes saw the industry quickly split into two camps promoting either the 182mm format or the larger 210mm format. The smaller of the two promises significant gains in module performance without requiring a major overhaul of other system components, while the larger promises even greater energy yields, but given the larger size and different features. power from these modules will require taking full advantage of much more disruption in system design, shipping and elsewhere along the value chain.
This is further demonstrated in a new white paper published by Chinese module producer JA Solar, in cooperation with TÃV Nord. In early 2021, the two set up a test field in Yinchuan, China to compare JA Solar’s DeepBlue 3.0 modules, which use the 182mm wafer, with others from an anonymous manufacturer using the 210mm format promoted by Zhonghuan Semiconductor.
The first results of the project were published earlier this year, and now a second white paper offers results based on six months of monitoring modules in the field. Both types of modules are installed at a site in Yinchuan, China. According to JA Solar, this site is an arid environment with an average temperature of 8.5 degrees Celsius and up to 3,000 hours of sunshine per year. Single-sided modules of approximately 7 kW for each type are installed on fixed tilt racks at an angle of 40 degrees one meter above the floor. The two sets of modules are connected to a 20 kW inverter. The study only uses data from a counter on the DC side, to avoid measuring the effects of the inverter as well as the modules.
Based on operational data from February to August 2021, the project found that the average daily energy yield of JA Solar modules reached 4.88 kWh per kW, which puts it about 1.9% above the 4.77 kWh / kW obtained by the 210 mm modules. The data also shows that on days of high solar irradiation, from May to July in particular, the average energy yield gap between the two types of modules widens to 2.5%, âthe manufacturer said.
JA solar attributes the lower efficiency of the larger modules to problems with the higher currents they produce. âTheoretically, since the internal resistance loss of 182 modules is relatively smaller, the differences in power generation performance of the two types of modules are caused by the difference in internal resistance loss and the resulting operating temperature difference. results “, they explain in the white. paper.
Looking further into the performance data, they found that the average operating temperature of JA Solar’s module was 1.7 degrees Celsius lower than that of the 210mm module. ââ¦ The difference in operating temperature is mainly due to the intensity of the radiation,â they explain. âThis shows that the advantage of 182 modules in electricity production from May to July comes from the growing difference in operating temperature between the two types of modules. “
The benchmark test site is set to run for a full year, and JA Solar says it will release a full analysis of performance data for the full year.
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