Since the implementation of the National Photovoltaic 'Leadership' Program in 2015, the conversion efficiency of PV modules has entered an accelerated period, and at the same time, the 'high efficiency era' of component technologies has been started. Among them, both high conversion efficiency and commercial mass production are possible. There is nothing more than the PERC component. From 2016 to 2017, from the front runner project to the ordinary photovoltaic power station, the power generation capacity has been greatly improved. The PERC technology is maturing, and the iteration of the traditional component technology has become mainstream.
With the continuous reduction of subsidies, further demand for component manufacturers to launch more efficient products with lower cost of electricity, PERC double-sided double glass components came into being. First-hand 'efficient', one-handed 'low-cost', around the development of the photovoltaic industry Big core keywords, PERC double-sided double-glass components are starting a new round of innovation in photovoltaic technology.
Synergy
Double-sided components, as the name implies, can be used to generate electricity on both sides. P-PERC, N-type PERT, IBC, HJT and other batteries can be used to prepare double-sided components. Glass is generally used instead of traditional back-sheet packaging. However, considering low battery cost and small technical constraints, P-type PERC double-sided double-glass components are now becoming mass production lines approved by more companies, such as JA Solar, Trina Solar, and Longji Leye.
The power generation gain of the double-sided module mainly comes from the back side, and it also increases the overall power generation of the module by receiving the scattered light from the atmosphere and the reflected light from the ground. According to JA Solar's solar energy calculation, which has completely independent core intellectual property rights for PERC double-sided power generation, PERC double-sided The power gain of double glass components can reach 5%~30%.
In fact, not only measured data, but more and more actual power plant operating data also confirms the high power output of PERC double-sided double-glass components. A group of yellow rivers from the first large-scale application of PERC double-sided double glass components in China The comparison data of Chenyang Gonghe 100MW photovoltaic power station shows that compared with the conventional single crystal, the single-watt power generation of the PERC double-sided double-glass module increases by an average of 13.35%.
The other set of data comes from the Boston 70kW rooftop PV project in South Africa. This project is the first double-sided double-glass PV project in Africa. Power station operating data shows that the PERC double-sided double-glass module has a gain of more than 14%.
In different projects, the power generation gains of PERC's double-sided double-glass components are different. The related person in charge of this component supplier, JA Solar, explained that the South African project has been installed on the roof of a white steel plate to further increase the reflectivity, thereby increasing the Back-side power generation. The power generation gain of two-sided modules is closely related to the actual application scenario. The higher the back-side reflectance, the greater the power generation gain, and the better the white reflective film.
In addition, the height of the components can be increased by increasing the height of the components and increasing the tilt angle of the components to increase the back-side absorption light source, thereby increasing the power generation gain of the backside. If matched with a tracking bracket, the 1+1>2 superimposition advantage can be more prominently displayed, and is expected to reach 46%. Power generation gains.
Reduce costs
In addition to having high power output advantages, the next step in deciding the technical value of components is the feasibility of mass production. Only technologies that can be rapidly popularized have higher value.
According to reports, PERC's double-sided double glass module has changed the back structure at the printing stage of the battery, and has a high degree of compatibility with the existing PERC series production line. In the assembly process, the existing double glass production line can be used to produce the product. Relatively mature. In early 2017, JA Solar Solar and other first-line component companies have already mass-produced PERC double-sided double glass components.
Considering from the system side, due to the power improvement of the double-sided dual-glass components of PERC and the advantages of 1500V, BOS costs such as land, support, and combiner box can be effectively reduced. Take the above-mentioned Yellow River Chenyang Gonghe 100MW photovoltaic project as an example, if all use PERC double The surface double glass 345W module can achieve the same power generation capacity with only 90MW installation, will reduce the installation volume of nearly 10MW, and save nearly 60 million yuan in project investment.
PERC's double-sided double-glass unit also has the natural advantages of dual-glass units. The glass structure is resistant to wear and corrosion. The water permeability is almost zero. The PID phenomenon is fundamentally eliminated. The fire rating is also determined by the ordinary crystalline silicon components. Grade upgrade to Class A, 30 year power warranty, Widely used in high temperature, high humidity, desert, seaside and other applications.
Redefine the cost of electricity
As we all know, as the core equipment of the photovoltaic system, the cost of photovoltaic modules accounts for about 45% of the total system cost. For every 1% increase in the conversion efficiency of photovoltaic modules, the power output of a single module will increase by about 6%. The cost of electricity can be effectively reduced, and components can be upgraded effectively. Efficiency is crucial.
The top-level policy also confirms this, not only that the front-runners base has increased the single and polycrystalline component thresholds to 17.8% and 17%, and the Ministry of Industry and Information Technology has followed up in 2018 to raise the threshold of component industries, and to newly build and expand the products of component companies. The conversion efficiencies of single-crystal and polycrystalline components are not less than 17.8% and 17%, respectively, and are in sync with the frontrunners. This is all driven by the technological innovations in the component industry, the efficiency of 'shifts', and the accelerated price-for-Internet phase-out.
Compared with conventional components, PERC double-sided double-glass components are undoubtedly an efficient technology to redefine the cost of electricity. Among the five projects that have attracted attention from Baicheng applications, three projects have selected PERC double-sided double glass components. , Became the leader of the project components of mainstream technology trends.
Of course, it is worth noting that there is no uniform industry standard measure for the power generation gain of the backside power of double-sided components. Enterprises and industries are actively calling for the introduction of standards as soon as possible to reasonably define the back-end power generation gains in order to give full play to PERC. Double-sided double-glass components for the positive effect of cheap Internet access.
