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Now in China, the charging station infrastructure construction is in peak, the attention of the government and enterprises in the charging station professional services is recharge or changing the power of choice, the China charging station integrated services have yet to be developed.

1, charging station successful operation case: China existing two largest most mature electric vehicle charging station is Beijing Olympic Games charging stations in the Shanghai World Expo and charging stations, the two charging stations at present is for electric city bus to provide fast battery replacement service, two charging stations are currently does not belong to the formal business operations, but governmental organizations under the pilot run. After two charging stations in common is dominated by a group of local bus operation, charging station founded and funded by a major national special fund and the place, running electric bus ownership bus group, Beijing Olympic charging station power battery lease from the battery manufacturers, according to the amount of electricity used per month paid battery manufacturers leasing costs (about 1 degree electricity 4 yuan), and the Shanghai World Expo charging stations directly from the battery manufacturers to buy batteries, also battery manufacturers responsible for early battery maintenance, and complete the relevant technical personnel training, the ownership of the battery belongs to the charging station.

2, at present, the national grid is accelerating cooperation with local governments to speed up the progress of the construction of charging stations. According to the plan at the beginning of the year working conference of national grid company general manager Liu Zhenya proposed, in the national grid will be in 27 provinces (autonomous regions) to establish public charging station 75 seat, DC ev charger for sale 6209 and part of the battery replacement station. Has announced the project including, Shaanxi Province Electric Power Company, the State Grid and Xian in cooperation with the years established 5 middle-sized electric vehicle charging station; Chengdu province electric power company and local government cooperation in building 3 electric vehicle charging station and 300 electric vehicle charger; cooperation with Yichang City Hubei Province electric power company established within a larger charging stations, 16 charging pile; Chongqing Electric Power Company in cooperation with Chongqing years established 50 charging pile CNOOC: a joint venture with China Putian Putian CNOOC new energy Co., Ltd. was established, specializes in energy supply network of electric
vehicles. The joint venture company has been working with the people of China, and plans to start the construction of a network of pure electric vehicles charging stations in the first half of this year in the first half of this year in China. Sinopec: Sinopec announced in Beijing as a breakthrough, the first time into the charging station industry. Sinopec Beijing oil branch is with Beijing Shouke group company jointly funded the establishment of the New Energy Technology Co., Ltd. Beijing Shouke of Sinopec, will mainly use the Sinopec existing area larger refueling station converted
into gas charging integrated service station. Sinopec will Beijing as a breakthrough into the charging station industry, the gas charging service stations will eventually be extended to the city, and then extended to Tianjin, Hebei, and even a wider range. PetroChina: it is alleged to have contact with local government departments, proposed the idea of building an electric car charging station.

3, China State Grid Corp charging station investment plan: the State Grid will be divided into three stages to build a charging station and charging pile. Charging the first phase (2010) station master device the size of the total investment will reach 3 billion yuan, in 27 provincial grid companies to construct 75 seat charging station and 6209 electrical car charger, initially built electric vehicle charging infrastructure network architecture; 140 million yuan investment in the second phase (2011-2015), electric vehicle charging station reached 4000 seat, synchronization to promote the construction of charging pile, the initial formation of electric vehicle charging network; the third stage (2016-2020) to invest 180 billion yuan, the electric vehicle charging station reached 10000 seat, synchronization to carry out a comprehensive charging piles supporting the building, built a complete electric vehicle charging network. Charging stations in 2020 total investment will reach 32 billion yuan. 2010 charging station main facility, charger, power to the scale of investment in the monitoring system, the active power filter will respectively reach 1.5 billion yuan, 20 million yuan, 6300 million yuan, the second phase of the annual investment scale will quickly grow to 14.4 billion yuan, 1.6 billion yuan, 6.72 billion yuan. 2010 charging pile investment scale of $4 billion 500 million yuan, 2011-2015 electric car chargers for sale investment scale of yuan, an average annual investment of 900 million yuan, is the first phase of the average annual investment of 5 times the size of. By 2020, the total investment of EV car chargers will reach 12 billion 500 million yuan.

The EV DC charger belongs to the power distribution network, the communication mode and distribution automation are often considered together. Communication is one of the key and difficult points in the distribution network automation, application communication of different regions and different conditions is different, specific to the EV fast charger, the modes of communication are wired and wireless:

1.Wired communication mode
Wired Ethernet (RJ45 cable, optical fiber, industrial serial bus (RS485), RS232, CAN bus).
Wired Ethernet has the main advantage of reliable data transmission, large network capacity, and the shortcomings of the wiring is complex, poor scalability, high cost of construction, poor flexibility.
Industrial serial wire (RS485, RS232 and CAN wire) has has the advantages of reliable data transmission and simple design. The disadvantage is that the network is complex, poor scalability, high construction cost and poor flexibility, low communication capacity.

2.Wireless communication mode
Wireless mode mainly uses the mobile data access service, such as GRPS, EVDO, CDMA, etc..
The mobile data service of mobile operators need to connect electric car fast charger to mobile data network, need to pay expensive monthly fee, with the EV DC fast charger quantity increasing, the costs will be bigger and bigger. At the same time, the security of data and the reliability of the network are limited by the mobile operators, which is not conducive to the safe operation of the equipmen. Mobile operators mobile access bandwidth is shared bandwidth. When the local area has a lot of equipment access and the average bandwidth of access to its reliability and each user will worsen, is not conducive to the charging pile group intensive access, large data amount of data transmission.

The conversion efficiency of the solar powered inverter is the efficiency of the converse the electric power from the solar panel to the electric system. In the solar power system, the inverter play the role of converting the DC power from the solar panels into AC, and transfer power to the power grid. The higher conversion efficiency of inverter is, the more electricity to sale or use can be more.

There are two major factors of inverter efficiency: one is that, when the DC current transfer to AC sine wave, need to use power semiconductor circuit of direct current to switch (a very short period of time turn-on and cut-off), then power semiconductor may generate heat, resulting in a loss. By improving the design of the switch circuit, the loss can be reduced to the minimum. The other factor is to improve efficiency by the inverter control experience. The output current and voltage of the solar panel will change with the sunshine and temperature. The inverter can control the current and voltage to achieve the maximum power (power point). The faster to find the best power point, the higher the conversion efficiency will be.

The control characteristics of the solar energy inverter will be different because of the different manufacturer’s products, and the conversion efficiency is also different.
Though the conversion efficiency of some inverters are high at the maximum power output, while are very low at low output power conversion efficiency, some inverters can keep the average conversion efficiency from high power output to low power output. Therefore, when choose the inverter, need to consider and the matching between the output characteristics and the solar panel.

SSP3117C 1-5KVA High Frequency Pure Sine Wave Solar Inverter with MPPT Charge (solar energy inverter,solar energy inverters)

Solar panels inverter systems are composed of solar cell, solar inverter, storage battery and controller.

The solar cell array increases the area of receiving light, which improves the efficiency of converting solar energy into direct current. The controller is designed to extend the life of the battery and the use of the inverter. The inverter plays the role of converting the DC power to AC, and the DC can supply power to AC load through the inverter.

The solar inverter is now divided into two categories, which are independent solar inverter and grid connected solar inverter.
Through reliability, rated output capacity, inverter efficiency, starting performance, harmonic distortion and output voltage stability to evaluate a independent inverter. While the grid connected inverter is mainly used in peak shaving PV power station and rooftop solar power systems, thus requiring the sine wave output current of the grid connected inverter and grid voltage should be in the same frequency. In addition, the off-grid solar power inverter is different from the independent inverter because the grid connected inverter must have island effect protection. It will bring tremendous danger to personnel and equipment if there is no island effect protection. For example, after the power supply of power grid is off, when staff maintenance the power system, the power supply of grid connected inverter may be still on, resulting in casualties. There are two kinds of prevention measures to be taken in this kind of accident, one is the active detection, the other is the passive detection. Active detection is to judge whether the power grid is on through testing the amplitude, frequency, phase and other parameters of the power grid voltage. While the passive detection is to to judge whether the power grid is lost through the detection of feedback signal. So as to make sure that staff and equipment in a safe state.

SSP3110C High Frequency Modified Sine Wave Solar Power System (Hybrid solar inverter system,solar hybrid inverter system,solar panels inverter systems)

With the continuous development of various new technologies, solar powered inverter faces a variety of challenges, mainly in the grid performance, protection functions and electromagnetic compatibility, etc.. Grid connected performance is to improve the efficiency of the grid, eliminate the DC component, reduce the current harmonics and so on. Electromagnetic compatibility is to control the voltage fluctuations, reduce electromagnetic radiation, improve the degree of interference and so on. In addition, need to consider that it shold be fast and smooth in the process of switching between the solar inverter and the city power. The above aspects are the main aspects of how to evaluate the solar powered inverters, if several performance metrics of an inverter is very superior, then will create a very good operating environment to the solar power system, and will also provide indirectly income to power supply company.