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Although it has been proven that bifacial modules harvest more energy compared to their conventional monofacial counterparts, this gain can depend on variables, which include among others, the albedo, the height and the gap between modules. In the case of the SF7 Bifacial tracker from Soltec, the percentage gained can range from single digit figures to almost 16% in high albedo conditions (55.6%).

Soltec was one of the first solar tracking companies to consolidate as experts in bifacial technology. In 2015, Soltec manufactured the first PV tracker specifically designed for the installation of bifacial panels in a power plant. This installation took place at the La Silla Astronomical Observatory in Chile. This 1.72 MWp PV plant used to be for experimental purposes and provided the basis for bifacial tracking technology. As a result, La Silla turned into an exceptional project through which Soltec was able to start studying bifacial tracking.

A few years later, in 2018, Soltec inaugurated the world’s first research centre specialising in bifacial solar tracking: the Bifacial Tracking Evaluation Center (BiTEC), located in Livermore, California (US). Its main purpose is to the assess the influence of installation parameters, such as the height of the assembly, shadows and the albedo on the efficiency of bifacial trackers, compared with the efficiency of fixed, monofacial structures.

The PV sector has undergone a marked trend in the installation of bifacial solar trackers. The SF7 tracker from Soltec is one of the star products for utility-scale solar plants that have opted for this type of technology as, under the right circumstances, they can harvest up to 15.7% more bifacial gain in high albedo conditions (55.6%) all year round.

The BiTEC research centre also studies the bifacial gain of the PV modules installed in the two most-widely used configurations in today’s solar tracker market:

• 1-in-Portrait: 1P
• 2-in-Portrait: 2P

According to studies undertaken by BiTEC over the period of one year, Soltec has confirmed that the SF7 Bifacial in 2P configuration can obtain 2.1% more bifacial gain than trackers in 1P configuration.

To date, Soltec commercialises its SF7 Bifacial tracker worldwide. This tracker has been installed in major projects of over 300 MW in Brazil, 200 MW in Chile and in some plants in the United States. The Spanish company has supplied over 300,000 trackers to projects around the globe, positioning itself as the third supplier of solar trackers worldwide. It is also the leading company in the Brazilian market.

Soltec’s R&D department has been working since 2004 to consolidate its position in the PV market and to continue developing the highest level of tracking technology through innovative designs that can adjust to any type of ground. As such, the company is able to customise the features of its SF7 tracker and the SF7 Bifacial to every project in which it takes part.

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Growat has been awarded Top Brand PV Seal 2020 by EuPD Research for its leading position in Australia and Netherlands!

By reaching out to installers directly in Netherlands and Australia, EuPD Research is able to gather valuable first-hand information of the technical aspects and the image of the inverter brands. Additionally, based on years of research, EuPD Research has developed its advanced evaluation model that emphasizes the aspects of successful brand management of inverter companies. The Top Brand PV Seal awards recognize the leading position of Growatt in Australia and Netherlands in terms of reliability, market penetration, brand awareness, satisfaction etc.

Growatt in Australia and Netherlands

Growatt has a strong presence in Australia and Netherlands. In Australia, over two million rooftop systems had been installed by 2018, and Growatt had contributed about 200,000 inverter solutions to Australia’s rooftop sector. That means one out of ten rooftop systems in Australia were using Growatt inverters.

In Netherlands, Growatt has become the No.2 inverter brand in residential solar sector. The company has become the main supplier for the iChoosr projects. With its Dutch office founded last year, Growatt continues to improve its service and provide faster delivery of products and replacements in the region.

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Acciona has started building the first grid-connected floating photovoltaic solar plant in Spain, in the region of Extremadura. This initiative is a demonstration project, created with the aim of studying the most suitable technical solutions for the installation of solar panels on lakes and reservoirs. Floating photovoltaic energy is becoming an increasingly popular option in many regions of the world, especially those that do not offer vast amounts of available land or ideal geographical conditions.

The installation, which will be completed by mid-year, is to be located close to the southern shore of the Sierra Brava reservoir, located in Zorita (Cáceres). Sierra Brava is an artificial 1,650-hectare reservoir built in 1996, fed by the waters of the Pizarroso stream. Designed to cover around 12,000 m2, the floating solar plant will occupy around 0.07% of the reservoir’s surface area.

Technology demonstrator

The new floating plant has been conceived as a pilot facility that will contribute to the analysis on the optimization of energy production from this kind of installations. The facility will complement the company’s photovoltaic innovation hub at the El Romero complex in Chile.

The Sierra Brava floating PV plant will study different solar module technologies and configurations in terms of inclination, placing and orientation -among other parameters- together with a variety of flotation structures.

In technical terms, the installation will consist of five adjacent floating systems – supplied by the companies Amilibia Marinas, Isigenere and Stansol- anchored to the bottom of the reservoir and linked to the shore by a jetty. Each system will have 600 photovoltaic panels with an estimated total capacity of 1,125-megawatt peak (MWp).

Each system will be connected to three 60kW inverters that will convert the direct current generated by the panels to alternate current. Each inverter will be connected to a small transformer centre that will rise the low-voltage current (400 V) to medium voltage (22 kV), and from there it will be sent underground along a 1.4-kilomtre power line to the grid connection point.

A small hub will be built to house operation and maintenance services, a control room and a visitor reception area. Another innovative element to be included is a meteorological station that will measure parameters of interest such as solar radiation, temperature, wind speed and direction, relative humidity, air pressure and precipitation. It will be connected to the control hub by fibre optics.

Environmental monitoring

The impact studies carried out conclude that the project is compatible with the environmental values of the reservoir. They include measures such as the installation of signage on the natural resources in the area around the reservoir, the installation of marker buoys to mark out the regulatory navigable areas, and the provision of nesting boxes and floating islands to encourage the nesting of certain bird species.

Environmental monitoring will be an important aspect, particularly on birdlife in the area, with the dual aim of protecting birds and studying their interaction with this kind of installation.

The project receives funding from the Spanish Centre for Industrial Technological Development (CDTI).

Why floating solar plants?

The field of floating photovoltaic plants is now taking off as its technological development demonstrates its technical and economic viability, particularly in regions with low availability of land or where land is used for other purposes such as agriculture.

Furthermore, floating photovoltaic power has other advantages over plants located on land, such as higher performance at lower ambient temperature, the availability of a flat surface with fewer shadows and ease of installation. These factors can end up offsetting the higher initial investment. With respect to the environment, floating photovoltaics have the ability to reduce water evaporation in reservoirs, improving water quality due to a lower rate of growth of algae

This technology is also of interest for hydroelectric power stations, with which it can share electrical infrastructure and improve their management flexibility. It can also be applied in areas with weak power grids.

Source: Acciona

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FuturENERGY February 2020

Hybrid systems integrating PV and diesel generators are a solution for those sites that need cost-efficient energy, and provide significant benefits to the consumption of energy from the local grid. But these systems can provide more benefits to users when combined with energy storage systems (ESS). The German company, Qinous, a system integrator of smart plug and play ESSs and Danfoss Drives have built numerous ESS installations together around the globe. Typically, these sites are located off-grid, and their purpose is to optimise the local energy production: solar PV generation and diesel generators. This article offers two examples of this type of installation, as well as the benefits they bring users…

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FuturENERGY February 2020

Enercapital Developments is a company specialised in the integral development of renewable energy projects (wind and PV power). With more than 15 years of experience and hundreds of projects undertaken around the world – over 5 GW in PV projects alone -, the company focuses its activity on the development of projects to bring them to the Ready to Build stage (RTB). Its services cover simple assessment to full implementation, making the company a reference in the sector. Enercapital is currently developing around 1.5 GW of PV projects in Spain, including a significant part of the Audax Renovables portfolio…

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FuturENERGY February 2020

HellermannTyton, global specialist in the manufacture of fastening, organisation, labelling and protection solutions for cabling, offers a unique range of high performance products for solar PV plant application. Designed on the basic premise of durability, an indispensable factor when choosing solutions and materials for the renewables industry, their long service life reduces both maintenance and operating costs…

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FuturENERGY February 2020

Mexico is a key market for solar power. In line with the national targets arising from the Energy Reform, by 2024, 35% of energy will come from renewable sources, a percentage that must rise to 50% by 2050. The abundant solar resource, high energy prices, the fall in technology costs and the growing need for resource diversification all combine to position Mexico among the world’s leaders in the development of the solar industry. With levels of solar irradiation that vary between 4.4 kWh/m2 and 6.3 kWh/m2, Mexico is the ideal country in which to implement solar technologies, whether PV or thermal. Forecasts rank Mexico fifth in terms of the new PV capacity expected for 2021, with 10 GW of capacity and a growth of 84%. All this places Mexico in a unique position for the development of the solar market and this is the context in which Intersolar Mexico will be held this September…

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    PV

    Founded in 2005, Guangzhou Sanjing Electric Co., Ltd (SAJ) is one of the largest global inverter specialists for renewable energy conversion, transmission and storage. It supplies grid connection inverters (0.7–60 kW), hybrid inverters, retrofit kits and monitoring platforms. In 2017, the company enjoyed a 24% market share of China’s residential PV market and was ranked among the Top 10 global manufacturers of residential solar inverters by IHS. In 2019, SAJ achieved 25% of the market share for residential storage inverters in the Australian PV market. Its latest product range, the R5 Series rooftop grid connection solar inverter, won the TÜV Rheinland “All Quality Matters” Award for the PV Inverter for Home Use Category in 2019. SAJ has now launched this product range in Spain to respond to the different needs of the solar market.

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    Trabajadores instalando con facilidad un módulo LONGi Hi-MO 4 en una estructura fija / Workers installing the LONGi Hi-MO 4 module with ease on a fixed bracket.

    There is little question that the solar market in general has thus far shown a growing preference for the LONGi Hi-MO 4 module with M6 wafer (166 mm), but there are nevertheless still some in the PV industry who have an ambiguous attitude towards this product. In this article, LONGi Solar puts together a Q&A list on the LONGi Hi-MO 4 module, with the aim of providing a more systematic and in-depth understanding of its background and benefits.

    Why has LONGi chosen the M6 wafer (166mm) specification for the Hi-MO 4 module?

    The cost saving and compatibility advantages of the M6 wafer (166mm) are achieved at both the manufacturing end of the industrial chain and the application end of the system. For the cost saving on the system side, the fundamental reason is that the increase of current basically makes use of the margin of the current commercial inverter and increases the capacity of a single string for unchanged Voc (the string length is unchanged). Since M6 bifacial modules fully utilize the current margin of the inverter, any wafer larger than M6 will limit the inverter’s current and lead to a loss in power generation. Although new module circuit design can reduce current, the benefit in BOS cost will disappear when compared with M6 modules.

    How has the LONGi Hi-MO 4 module evolved?

    LONGi optimized the design size of the Hi-MO 4 module earlier this year. The size of the 72 cell module changed to 2094x 1038 mm. The efficiency of mass produced modules exceeded 20% across the board, and that of the 450 W module reached 20.7%. The improvement in efficiency brings further BOS cost savings, and the land area occupied by a power station is also significantly reduced.

    What is the difference in BOS cost between the LONGi Hi-MO 4 module and modules of other specifications?

    With a 72 cell module with a 158.75 mm silicon wafer, at a PV plant adopting a centralized inverter and fixed bracket configuration, the BOS cost of the Hi-MO 4 can be reduced by 0.65 US cents/W. Although the power of a 78 cell module is equal to that of the Hi-MO 4, the reduction in the number of series connections leads to a significant gap between the cost saving of its BOS and that of Hi-MO 4.

    At a PV plant adopting string inverters, the BOS cost of Hi-MO 4 can be reduced by 0.86 US cents/W due to the increase of capacity ratio.

    LONGi’s Hi-MO 4 module is obviously larger. Can it really reduce installation costs?

    Obviously, a high power module with an M6 wafer (166mm) brings higher power generation gains and lower BOS costs in practical application. But will the increase in module size and weight make the actual installation more difficult? Will it add more installation costs?

    According to detailed research, there is no obvious difference between a Hi-MO 4 module and a conventional module in terms of handling, upper bracket and installation work. However, due to the increase in power of a single Hi-MO 4 module, the number of modules required is lower, meaning that installation effort is reduced, efficiency improved, and the overall construction period shortened, significantly lowering overall installation costs.

    What is the market performance of the LONGi Hi-MO 4 module?

    LONGi’s Hi-MO 4 module has been in a state of relatively short supply since it was launched, with more than 10 GW of cumulative orders and letters of intent. Shipments in 2019 reached 1.5 GW. Projects where the Hi-MO 4 module has already been utilized cover, among other territories, all regions of China, Bangladesh and Vietnam. Feedback from customers and EPCs has generally been that significant savings have been seen in most aspects of the construction process.

    The market response to Hi-MO 4 has been extremely positive. In 2020, the capacity of the module will exceed 20GW, ensuring stable global supply.

    After continuous optimization, the Hi-MO 4 module has an impressive mass production version, with a further reduction in weight. With the addition of bifacial technology, BOS and LCOE costs have also been lowered. The LONGi Hi-MO 4 module has quickly become the preferred choice for global clients, especially for large-scale PV power plant investors, and has demonstrated huge investment value worldwide.

    Source: LONGi Solar

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    Spanish manufacturer of single-axis solar trackers, Soltec, in collaboration with UNEF, the Spanish PV Industry Association, is organising the third edition of its seminar “Solar PV plants in Spain: deployment, financing and the energy future”. The seminar will take place on Thursday, 5 March at the Novotel Madrid Center hotel in Madrid.

    Starting at 9:00, the event will include several round table discussions in which a host of experts from the world of renewable energies and the financial sector will be taking part. Following the opening ceremony, at which the CEO of Soltec, Raúl Morales and the chair of UNEF, Jorge Barredo will speak, the Secretary of State for Energy, Sara Aegesen, will give the welcoming speech.

    The first round table will be dedicated to a discussion on the deployment of PV plants in Spain and the possibilities on offer in the Spanish market; while the second will focus on the development of R&D+i in the PV sector. The third discussion group will examine the challenges of the 2030 Agenda as regards ecological and renewable energy projects; and, the fourth and last round table will look at the financing and bankability of solar PV projects.

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