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We recently attended the 13th REI expo, one of the leading renewable energy show in India, where industries are looking forward to showcase their latest solar energy innovations. In this year’s exhibition we could see a dip in the innovations on display based on wind energy, while there was a lot of tech buzz in the solar energy segment.
India is seeing a big push in the new large scale solar projects along with rooftop solar capacity additions across commercial, industrial, public sector and residential projects.
As per the latest reports of IEEFA rooftop sun-powered establishment will see an increment at a CAGR of 50 percent in the following three years. India is expected to achieve a total of 13 GW of installed rooftop solar capacity by FY22. There were numerous exhibitors in the REI Expo for solar energy who displayed their products and advancements. The following are a few Solar Modules which were launched at the expo:
International Solar Module Companies
Jinko Solar – SWAN Bifacial Module
SWAN – New Bifacial Module with Single Glass & DuPont™ Clear Tedlar® film-based backsheet, uses high-efficiency Jinko Solar’s Cheetah Mono PERC technology. Its 158.75 mm cell size can generate up to 415 Wp from front side. Combined with Jinko half-cell technology, which reduces power loss and the possibility of hot spots, enables it to increase module power and reliability.
Jinko Solar is the first module manufacturer to produce p-type bifacial big cells module with DuPont™ Clear Tedlar® technology. Swan represents a unique combination of bifacial technology and simplicity of standard module structure.
For SWAN module, Jinko Solar won Intersolar Award for Leading Solar Technology, in Munich, this year.
Key Features of Swan Bifacial Module:
- Swan is 8.5 kgs lighter in weight compared to Bulky Double Glass Bifacial modules. It thus reduces labor costs for module installation, MMS & Logistics. This results into higher IRR & lower LCOE.
- Higher structure strength: Framed modules are less prone to bending and cracking during transportation and installation than frameless ones. Framed Structure of SWAN also simplifies its handling and installation. Thus, it reduces PV module breakage rate.
- Limited light capturing capacity of Double Glass bifacial modules: In Swan, white mesh in-between the cells can be also printed on the transparent backsheet to increase inner laminate reflection, providing up to 5 Wp extra module power.
- Different frame cross section in Swan compared to traditional C-shape in mono-facial modules: This would help in decreasing the shading by the frame over the rear side of the cells, increasing the bifacial gain.
- Cleaning backside of module: Hydrophobic surface of the transparent backsheet provides excellent anti-staining features, making module cleaning easier and reducing O&M costs.
- Higher Price Delta of Double Glass Bifacial modules, compared to mono-facial Mono Perc Modules: Price delta of SWAN is less.
- Enhanced Reliability: 30-year performance warranty
- Backsheet breathability minimizes risk of delamination, bubbles or corrosion during module lamination and lifetime operation
Risen – Jäger series
Jäger series were born in response to some of the key industrial pains and customer concerns: how to reduce LID（Light-induced Degradation）, LeTID (Light and elevated Temperature Induced Degradation), internal loss, shadow shading and BOS cost. As a new generation of high performance, high cost-effective and reliable products, Jäger series have a total of four types of products: RSM120、RSM132、RSM144 and RSM156, of which the highest module conversion efficiency can reach up to 20.6%，and the highest power output can reach up to 440Wp.
Jäger high-efficiency mono-crystalline cells deploy the world leading two-side-stack-passivation technology, SE (Selective Emitter) technology, low-temperature firing technology and enhanced current injection technology, which can increase the cell conversion efficiency and at the same time reduce LID and LeTID. Jäger cell conversion efficiency can reach up to 22.51%， with the efficiency of mainstream bin between 22.1% and 22.2%.
The reduction of module inner power loss can efficiently increase the module actual power output. This loss is caused by several negative factors such as the light reflection loss, the conductor/cable resistance loss, and the inter-electrical connection loss and so on. To decrease these negative affections, various methods have been researched and used in PV industry, Jäger series products also use some advanced methods to decrease this inner loss. The Half-cut cell technology is one of the methods which can decrease the inner electrical connection loss. This kind of Half-Cut design not only improves the power output of the module, but also effectively reduces the adverse effects of shadow shading to the minimum. At the same time, the working temperature of the Half-cut Cell module is 2 to 3 ℃ lower than that of the Full cell module due to the reduction of the current. In the case of shading, the highest temperature of the module is about 20 ℃ lower than that of the Full cell module, which greatly improves the stability of power output and the long-term reliability of the module.
As a cost-effective product, the application of Jäger products can effectively reduce the BOS cost of PV system. The BOS cost of a 50 MWp ground-mounted power plant is simulated and compared by Risen Energy engineers and technicians in the White Paper, using the 335 Wp module and Jäger 400Wp module. The results show that the use of high power modules can reduce the quantity of modules, giving rise to the reduction of construction and installation costs of ground piles, brackets, DC cables, shunt boxes and photovoltaic field areas.
REC – REC Alpha
Utilizing heterojunction technology, the REC Alpha Series reaches an astounding 21.7% efficiency. This translates to a power density of 217 W/m², providing 20% more power than conventional panels in the same area. Based on proprietary panel design with revolutionary cell technology, the new product is already acknowledged by a granted design patent.
Emerging from REC’s leadership in half-cut cell technology, the Alpha integrates half-cut heterojunction cells (HJT) and advanced connection technology (designed by engineering experts from Germany and Singapore). With HJT, REC combines the benefits of crystalline silicon solar cells with those of thin film technologies for much higher efficiency and energy yield. With a much lower temperature coefficient of 0.26 %/°C it is especially suited for hot climate conditions like in India.
Key features of REC Alpha:
- REC’s pioneering and award-winning ‘Twin Panel’ design: Introduced in 2014, this delivers demonstrably better performance in shaded conditions.
- REC’s commercialized half-cut cell technology: The Alpha features high efficiency n-type mono wafers between thin layers of amorphous silicon.
- REC’s unique frame design: The 30 mm thin frame construction allows more panels per pallet, an easy installation and allows the Alpha to withstand snow loads of 7000Pa.
- Industry-leading warranty: 25-year product warranty on installations by REC Solar Professionals (otherwise 20 years), and a 25-year power output warranty, guaranteeing 92% of nameplate power after 25 years.
- Evenbetter for the environment: Manufacturing of REC Alpha solar panels requires less energy, which is further reducing the carbon footprint.
With the REC Alpha Series, customers will get over 20 percent more power from the same area and the same number of panels – or, put other way, the same energy output from less space. This reduces the Balance of System (BoS) costs. In addition to better economics, customers can also look forward to an increase in the value of their property: several studies in various countries show that a premium solar installation on the roof is adding value to the property and is a highly desired extra for home-buyers, not least due to the better energy performance rating.
With the Alpha, REC is bringing a solar panel to the market that creates a triple win opportunity, for REC, our partners and solar professionals as well as for households and businesses who want to create a legacy of sustainable energy for the next generation.
TRUNSUN – TSHP-144 340W
As one of the world’s leading PV module manufacture, Trunsun Solar always put great efforts on the development and maintenance of oversea market, as well as on focusing clients demanding trend. Trunsun will continue its innovation and development so as to provide advanced products and services with high-quality and lower LCOE products.
The displayed module can be regarded as one of the best solutions for Indian PV market with the five key features:
Higher Module Efficiency: Brings 5-10W power gain due to half-cut production system
More Energy Yield: Lower NMOT and better temperature coefficient by lower Cell series resistance, helps boost energy yield
Lower Operating Temperature, More Reliable: Lower operating temperature and hot spot temperature during the sunny day, making the module prevail during the sunny days.
Better Shading Tolerance: Thanks to Paralleling circuit design, more power generated under shading condition and during morning& evening time
Better Micro Crack Resistance: Minimize the impact by micro crack by limiting cell damage and potentially extending area by half-cut module architecture.
Indian Solar Module Companies
Topsun – Solar PVGU
As the Solar Industry is at its peak and no customer can say no to solar, here is where one after another technological innovation has no limit. The one which we found during REI was from none other than Topsun Energy Limited.
Topsun has come up with a latest and unique solar panel called “PVGU”. Can you imagine who becomes to fisrt user of PVGU? It is none other than I.S.R.O. – The organization who believes in technology and who understands technology. I.S.R.O. has installed these panels at their new campus situated at Bopal- Ahmedabad. Below are some USPs of this product.
What is Solar PVGU? Solar PVGU is combination of Solar PV Module & DGU integrated with Air Gap filled by inert Gas & Sealed with hot melt to generate isolation sealant Provide isolation from heat and noise as well. Front Face Generates Electricity while the back face can be a tinted or frost Glass design available in More than 7 variables to keep inside face aesthetic and appealing.
Why Solar PVGU? Glass is nowadays becoming an integral part of Civil Engineering & Architecture for exterior face lift for buildings “then why not Generate electricity as well, cool the place and maintain interior aesthetic with safety using Solar PVGU.
Why and how it is useful?
- Electricity Generation
- Reduction in HEAT and also reduce power required for space cooling.
- Reduce outside noise levels
- Attract natural light to save on day lighting
- Aesthetically appealing inside face
- Human safety within building and outside
Spark Solar – 6 Bus Bar 144 half cell Mono PERC modules
Spark Solar unveiled the completely new module series RAPID DUO 6 Bus Bar 144 half cell Mono PERC modules. The RAPID DUO module series combines half-cell technology, six busbars and the PERC cell technology. Thus, the monocrystalline modules reach efficiency of close to 20% and power outputs of up to 395 Wp from 144 half-cells.
Spark Solar has the widest portfolio of solar modules which also includes its newly-developed glass film BIPV modules . “We are thrilled to unveil our latest high-end innovation to global customers. With the RAPID DUO series, Spark Solar will be setting another benchmark in terms of high-end performance and reliability of crystalline solar modules under real-life conditions. Customers and investors are looking for the highest possible yields and reliability.
Benefit of 6 Bus bar Solar Panels:
6 Bus Bar module is the latest technology in the market and it has several benefits over 5 bus bar or 4 bus bar modules. The six bus bar PERC cell technology combined with 144 half cell technology and 3 piece junction box boost module output upto 20Wp. “ High power in the smallest space with maximum durability”.
The busbars are the metal lines you see going down the cells of the solar panel. They are the wires that connect each cell to the other, allowing the current to flow. Since each cell is generally just over a half a volt, the bus bars wire them together in series to create the higher voltages needed to be a usable solar panel.
Higher Output per cell = Higher Efficiency
As the distance between adjacent bus bars is shorter in 6BB modules, the current path is shorter leading to higher output. Additional busbars creates lower resistance between cells. Ohms Law tells us that as resistance (ohms, R, or Ω) go down, the current (amps) goes up. And when current goes up for the same voltage, power (which is volts times amps) goes up.
The result of the additional busbars is that the solar panels are about 2% more efficient. This means that they can pack 2% more power in the same size solar panel.
Lower Residual Stress in 6 bus bar cells= Lower Degradation
When conductors are soldered onto solar cells to assemble them into solar modules, the soldering activity leaves behind residual stress in the cells. Over time the residual stress converts into micro-cracks which ultimately reduces the generation. Due to shorter distance between the bus bars in 6BB cells, the residual stresses are lower in 6BB modules by up to 10%. Hence long term generation of 6BB modules is superior as degradation is lower.
Today significant losses occur during stringing the cells in a module by using standard 5 or 4 busbar technology. Simulations demonstrates that the multi-busbar design allows higher cell and module efficiencies compared to 3 or 4 or 5 busbar cell design, and in the same time reduces the amount of silver needed for the front electrode.