Currently, the cost of PV systems in Germany and the United States were $ 3 per watt and $ 6.19 up to $ 3.19, the cost margin. According to the report, the non-hardware "soft costs" is the main reason of the cost of the margin. Germany's population is more dense, transportation and supply chain costs can be cut, and by the effect of the publicity, the solar power generation in the country to accept a higher degree - these also are factors promote lower the cost of PV systems in Germany.

Lawrence - Berkeley National Laboratory (Lawrence Berkeley National Laboratory, LBNL) released a report on why the German residential photovoltaic system costs significantly lower than in the United States, "the theme to make in-depth study.

Currently, the cost of PV solar controller systems in Germany and the United States were $ 3 per watt and $ 6.19 up to $ 3.19, the cost margin. According to the report, the non-hardware "soft costs" is the main reason of the cost of the margin. Germany's population is more dense, transportation and supply chain costs can be cut, and by the effect of the publicity, the solar power generation in the country to accept a higher degree - these also are factors promote lower the cost of PV systems in Germany.

It is worth noting that the Americans more cautious attitude, a new technology acceptance is relatively low, this means that the United States need to pay high acquisition costs.

The report said, the German installers install expenditure in marketing and advertising costs only $ 0.02 per watt for customer acquisition system design costs $ 0.01 and $ 0.04 for other customer acquisition costs; while the United States installers marketing expenditure of $ 0.34; system design costs $ 0.11; other customers spent $ 0.24.

The size of the market so that the German installers to benefit from the low cost - the cumulative amount of residential PV wind inverter systems installed for the United States as much as 3.6 times. The event that a per capita basis, the multiples are expected to rise to 14.

Another finding of the report is Germany continued to cut the feed-in tariff subsidy rate forcing installers to keep prices low.

DOE SunShot Initiative held a webinar for the findings of the report will be held February 26. The authors of the report say the solar market to the larger and more compact in the direction U.S. policy should encourage the development of national solar subsidy rate should be regularly cut and reduce grid, approval, and review of the cost.

 In fact, off-grid inverter is a basis for the development of bi-directional inverter, bidirectional inverter is actually a combination of grid inverter and off-grid inverter technology characteristics, applied to the local power supply network or power generation systems and grid parallel occasions.

Such applications although not much, but because of the class system is a prototype of the microgrid development, in line with future distributed generation infrastructure and commercial operation mode, so technically belongs to the past and a role, that is, in the current grid applications and future role as a bridge between the local micro-grid applications.

In fact, in some of photovoltaic power converter development of faster, more mature countries and markets, the microgrid applications to families, small regional units start slowly developed. Meanwhile, the local government to encourage family unit development of local power generation, electricity storage, electricity network, priority to new energy generation for personal use, insufficient part taken from the grid.

Therefore need to consider more bidirectional dc to ac inverter control function and energy management functions, such as battery charge and discharge control, and network load / off-grid operation strategy and reliable power supply strategy. Summary, the bi-directional inverter more from the perspective of the whole system to play an important control and management functions, rather than a single only consider the requirements of the grid or the load requirements.

As one of the direction of development of the grid, the local power generation as the core to build new energy power generation and distribution, electricity network will be one of the ways that future micro-grid development. In this mode, the local micro-grid and the large grid to form an interactive relationship microgrid will no longer close to rely on a large grid run more to run independently, that the islands of the way in the running.

Reliable electricity to meet the region's security, priority, only wealthy in the local power or the need to take power from the external power grid, form and network operation mode. All aspects of technology, policy, and other conditions are not ripe, the micro-grid and no large-scale applications, only a small number of demonstration projects in operation, and these projects, and network operation mode of the majority.

Micro-grid inverter is a combination of the technical features of the bi-directional DC to AC Converter, also play an important grid management functions, is typical of the inverter, control and management of one machine for the integrated control of inverter. Assumes local energy management, load control, battery management, inverter, protection and other functions, and management functions with the completion of the entire micro-grid and microgrid energy management system (MGEMS), will build the core of the micro-grid system equipment.

Compared to grid-connected inverter and inverter technology development, has been out of a simple function of the inverter, and carries a micro-grid management and control functions, from the system level attention and solve some problems. Figure 2 shows the micro dot net project cooperation system configuration diagram, the system has some typical, is powered by diesel generators play basic unit of renewable energy generation as a supplement.

Inverter energy storage provided by the company, to provide bi-directional inverter, converter, battery charge and discharge, micro-grid management system to manage the entire microgrid contactor A, B, C are controlled by a micro-grid management system cut off non-critical load, according to the electricity supply in the island operation to maintain the safe operation of the micro-grid stability and load.

 According to the the latest PV inverter IMSResearch study predicts that in the 2012-2017 period, the PV inverter after-sales service and extended warranty market will grow 110%. PV inverter hardware profit margins are being squeezed, but the after-sales service market is expected to more than double 2017, amounted to $ 1.7 billion, provides a valuable additional source of profits for suppliers. 

The analysis results show that caused a major driving force of this growth will be one of the utility-scale PV mounting system is expected to be one of the fastest growing areas in the next five years. These photovoltaic installation systems usually use a large three-phase inverters, these inverters tend to buy the annual service plans to ensure that the best operating results. In 2012, 26% of the high-power three-phase power inverter with bundled service plans is expected that this figure will grow to 34% in 2017. In many cases, the banks and financial institutions will specify the inverter service plan requirements as loan conditions, PV mounting system to ensure effective operation and to ensure that the inverter downtime minimized. 

After-sales service of the PV inverter market will show revenue growth trend, but at the same time, suppliers will also face a variety of challenges, including the response to the increasingly geographically dispersed PV market. 

"With the different countries, local legislation provides for a minimum length of the warranty period, the supplier had to establish service offices in emerging markets to provide customers with adequate response time." The IHS PV analyst CormacGilligan explains, "not only a focus on the photovoltaic industry, industrial inverter manufacturers may start to provide after-sales service in the PV market, because they are usually existing business to serve other industries in these regions. single PV inverter business makers may cooperate with third-party service partners until they are able to establish a local service center in these emerging markets. " 

In order to promote after-sales service, and make themselves stand out from the competition counterparts, inverter suppliers are different methods and strategies for marketing and development, service plans and extended warranty. grid tie inverter suppliers face inverter hardware prices increasing pressure, and has a longer warranty micro inverter competing technologies are continuing to increase, some inverter suppliers are no additional the cost of the case to provide a longer warranty period, leading inverter manufacturers also provide a complete PV power plant operators and maintenance services. 

Previously IMSResearch over four hundred buyers of PV inverters survey shows that more than 90% of the respondents said that good quality assurance and after-sales service "for most projects, it is important to" or "for all projects is essential. " The IMSResearch photovoltaic inverter and BoS, research and analysis manager, said: "Taking into account the nature of the PV market is highly competitive, attractive warranty and service reputation and provide good after-sales service is increasingly becoming the supplier of PV inverters can enhance its brand SamWilkinson , a very important way to gain market share. "

 Recently, the PV inverter products in China, will be applied to 8.3MW photovoltaic power plants in Germany, the project is located near Berlin, Germany, developed by the renowned photovoltaic Athos Solar.

Recently, Asia's largest manufacturer of inverter Sunshine Power Co., Ltd., announced another successful application the its new the inverter SG30KTL in the German market. It is reported that the announcement of the project is located near Berlin, Germany, developed by the renowned photovoltaic Athos Solar, the total installed capacity of 8.3MW.

Inverter, also known as the power regulator, according to the power inverter for photovoltaic power generation system can be divided into two kinds of independent power supply and use. According to the waveform modulation method can be divided into a square wave inverter, the ladder wave inverter, sine wave inverter and modular three-phase inverter.

Inverter for grid system, according to the presence or absence of the transformer can be divided into the transformer type inverters without transformer type inverters. There are many types of inverter, and therefore need to pay special attention to select models and capacity. Especially in the solar power generation system, the level of efficiency of the inverter is an important factor to decide the size of solar capacity and the battery capacity.

China's "Eleventh Five-Year" period, such as grid tie inverter, photovoltaic power generation equipment multiple stages in the R & D and innovation, less affected by policy concerns. "Twelfth Five-Year" period, the photovoltaic power generation market trend is the development of the whole industry chain, crystalline silicon, components other than the equipment will be subject to the further attention of the market and policy, Development and Reform Commission will be included in the Catalogue for the Guidance inverter encouraged, is The manifestation of this trend.

In 2010, China's photovoltaic grid capacity of 500 MW, the inverter market of about 500 million yuan. In June 2011, the "12th Five-Year PV installed capacity target of domestic sharply upwards to 10GW, double the target than previously announced. Assume that all of these installed and network cost calculated in accordance with the 1 / W, expected by 2015, domestic inverter market will reach 100 billion yuan.

PV inverter industry, the international leader in Germany Asma (SMA), the vertices of the technology in the industry. The strength solar panelcompanies: Hefei Sunshine Power Sanjing new energy, national grid XJ Group Co., Ltd., Delta-CIMIC, Samil Power, Beijing Corona, Esso new energy, Xianaike etc.; development of off grid inverter technology is relatively mature, the country already has a number of more advanced technology enterprise.

With the growing competition in the PV inverter industry, large-scale PV inverter enterprise merger integration and capital operation is becoming more frequent, the the excellent domestic photovoltaic inverter manufacturers increasing emphasis on industry market research, especially for enterprises in-depth study of the development environment and changes in customer demand trends. Because of this, a large number of excellent domestic photovoltaic inverter brand rapid rise, becoming a leader in the PV inverter industry!

 Century New Energy Network News: Recently, the new Suzhou ohm Nick energy R & D production omniksol-13k/17k/20k-TL series three-phase grid inverter smoothly Denmark EN50438 certification. At this point, Suzhou ohm Nick New Energy Technology Co., Ltd. TL series grid inverter have been obtained Danish certification. By this certification authority ohm Nick inverter has been fully equipped to supply capacity in the Nordic market. The Denmark EN50438 certification obtained, in order to further develop the Nordic market, and improve product competitiveness, has played an important role in promoting 

Ohm Nick three-phase grid series power inverter is in full accordance with the design and development of large-scale the roof series and commercial power station. The product line power 13kW, 17kW and 20kW, with stable performance, high reliability, and ease of installation advantages. Unique high-frequency inverter, dual MPPT tracking technology, making the maximum efficiency of up to 98.2% the European efficiency up to 97.8%. MPPT tracking accuracy of up to 99.9%. Its stable, efficient performance, user-friendly operator interface. Simple and portable installation, Europe, Australia, Southeast Asia, the majority of users of praise. 

The EN50438 certification ohm Nick PV inverter to TL series one to enter the Danish market tickets. As a the increasingly rising star of the Nordic market, Denmark has a huge potential for development, and at the same time continue to increase efforts to support local government. Ohm Nick has established a partnership with the the Danish local well-known PV companies green sol, via sol, etc.. I believe in the near future, the ohm Nick photovoltaic inverter will be more and more Danish customers choose the recognition. 

NARI Solar Energy Technology Co., Ltd. 17kW in power photovoltaic grid-connected inverter by the German TüV Nande testing and certification agencies test. 

Move its photovoltaic grid tie inverter products scale standardized production laid the foundation of great significance in promoting the process of internationalization of the related products also. 

Photovoltaic grid-connected inverter is the core equipment for photovoltaic power generation system, mainly used in photovoltaic panels convert DC into AC grid. 

Detection and access standards are very strict, in addition to the need to complete the normal commercial / industrial electrical equipment safety testing and electromagnetic compatibility testing outside, but also need to complete the different countries and network testing, to meet the different power parameters and the protection of the power grid fluctuations needs. In power solar panel suitable for roofs, residential, small and medium-sized power plants, a wide range of applications, ease of installation, welcomed by the international market, domestic development in power products ability fewer companies. 

As the authoritative international certification bodies the TüV Nande certification effect of scale photovoltaic product safety and quality, by the wide recognition of the world, especially the European manufacturers and national certification bodies.