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In 2017, affected by the double factors which the accelerated expansion of the domestic PV distributed market and the rapid rise of foreign emerging markets, photovoltaic industry in China has been developing continuously and healthfully, the scale of industry has been steadily increasing, the technology level has been significantly improved, the production cost has been significantly reduced, the business efficiency has been continuously improving, and the foreign trade has been keeping stable.

1.The scale of the industry has grown steadily.
In 2017, the output of polysilicon in China was 242 thousand tons, an increase of 24.7% compared with the same period last year. The output of silicon wafers increased by 34.3% over the same period last year, and the output of battery chips 68GW increased by 33.3% compared to the same period last year, and the output of components increased by 76GW, up 31.7% over the same period last year. The output of 87GW in China increased by 34.3%. The global proportion of the production scale in each link of the industrial chain is over 50%, and continues to be the first in the world.

2.The level of technology is increasing.
P single crystal and polycrystalline cell technology has been continuously improved. The average conversion efficiency of conventional production lines is 20.5% and 18.8% respectively, and the advanced production lines with passivated emitter back contact technology (PERC) and black silicon technology reach 21.3% and 19.2% respectively. The production process of polysilicon is further optimized, and the average power consumption of the industry has been reduced to less than 70KWh / kg.

3.The cost of production dropped significantly.
Under the promotion of the technological progress and production automation, intelligent transformation, Chinese leading enterprises of polysilicon production cost drop to 60 thousand yuan / ton, component production cost drop to 2 yuan / watt solar power system, the investment cost drop to 5 yuan / watt, the cost of electricity drop to 0.5 – 0.7 yuan / kwh.

4.The benefit of the enterprise continues to be good.
Thanks to the expansion of market size, the enterprise shipments increased greatly, at the same time due to technical progress by decreasing production cost and profitability of Chinese photovoltaic business improved significantly, the upstream silicon material, silicon wafer, auxiliary material, and the downstream power solar inverter, link the highest gross margin reached 45.8%, 37.34%, not 21.8%, 33.54% and 50%.

5.Foreign trade remained stable.
From January to November 2017, the total export of PV products in China was 13 billion 110 million US dollars, up 1.4% over the same period last year, and the import of polycrystalline silicon was 144 thousand tons, up 17.3% over the same period last year. Affected by the continued expansion of the global PV market, the export volume of PV products in China has increased rapidly, but the export price of products has been declining. The growth rate of emerging markets such as Mexico, Brazil and India has increased, and the export of India has ranked first.

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The installation personnel of the solar power generation system should carefully read and observe the manufacturer’s instructions. Therefore, when installing the solar controller, the solar array should be covered with opaque cloth, and the load will be disconnected to protect the equipment and installation personnel, and the installation position should be well ventilated, so as to prevent the heat dissipation components from being too high. The solar inverter and the controller are much the same. But it should be noted that when it connects the DC cable to the inverter input terminal, we must pay attention to the polarity of the inverter and confirm that the positive and negative polarity have been accessed correctly. In addition, the specific wiring and debugging methods of the solar MPPT charge controller and inverter need to be detailed to refer to the technical instructions carried by the solar photovoltaic system.

SOROTEC Solar MPPT Charge Controller

1.Adopt advanced MCU microprocessor control technology.
2.12v/24v self detect to choose output voltage.
3. Advanced MPPT technology ,High converting efficiency higher than 97% for minimizing energy loss.
4.Capable of selecting different charging mode for various type of batteries
5.capable of connecting additional DC load for wide applications.
6.Three stage charge control system(bulk , absorption, and float mode)with optional temperature compensation.
7.LED indicators display charge status in real time.
8.Pulse Width Modulation(PWM)technology combined with a multi-stage charge control algorithm leads to superior charging and enhanced battery performances.

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A safe and reliable DC switch
The household power station is very complex, location is also relatively remote, once the component of short circuit grounding fault, the after-sale staff can’t arrive at once, may cause a fire or electric shock, this allows the owner to disconnect DC switch (which operation is very simple) to avoid further escalation of fault.

Minimize the noise
The household with solar inverter is installed in the home. If noise is produced in the operation, it will bring great inconvenience to people’s life. The inverter’s voice comes from the fan and inductor. The solar inverter should be designed without fan, and there is no fan inside and outside to eliminate the biggest noise source. The inductor is glued together and put into an aluminum case box separately, so as to reduce the current and the vibration sound of the inductor.

Take a variety of display methods
It need a LCD display, intuitive and convenient. It is suitable for some users without smart phones. Physical buttons are short in life, and voice control buttons are simple and long life. Using GPRS monitoring, intelligent mobile phone monitoring station, can view the unified management whenever and wherever possible, thousands or even tens of thousands of power station, two-way monitoring system can provide active service, found the problem and fault warning, remote diagnosis and treatment function.

High power generation
There are many factors that affect the power generation of solar inverter. First of all, the inverter must be stable and not bad, because once the inverter fails, it will take two or three days even five or six days to repair or replace it. During this period, the electricity cost will be greatly reduced. Secondly is the efficiency of inverter, the three efficiency, the maximum efficiency, the weighted efficiency and the MPPT efficiency of the inverter. The most important factor affecting the power generation is the weighted comprehensive efficiency, because the inverter mostly operates at low power. Thirdly is the DC working voltage range, the wider the voltage range, the early start and late stop, the generation time is long, the higher the power generation. Fouthly is that the MPPT tracking technology has high precision, fast dynamic response speed, can adapt to the change of light, and improve the efficiency of power generation. Fifthly is the solar inverter output voltage range also should be wide, the best can reach 180-270V, of course, can not be too high, more than 270V will have an impact on home appliances.

REVO-II On/Off Gird Hybrid Inverter with Touch Screen

1.Touch screen display.
2.Output power factor PF=1.0.
3.On + Off Grid with energy storage.
4.Energy generated record, load record, history information and fault record.
5.Connected with battery optional.
6.Wide PV Input Range.

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After decades of development, photovoltaic power generation have made some achievements. Photovoltaic grid connected power generation system is composed of photovoltaic array, solar charge controller and grid connected inverter. It converts the direct current generated by solar inverter to grid connected inverter and converts it into a power generation system that meets the requirements of grid. Photovoltaic grid connected power generation system can supply power directly into the power grid, but the stability of the power generation process is poor, and it will also have a certain impact on the power grid.

Photovoltaic grid connected power generation and load characteristics
Photovoltaic power generation is greatly affected by the environment, and its power generation will increase with the increase of illumination. Generally, when the sunshine is shining, the power peak is generally at the strongest point of sunshine, which is about 10:00 ~ 14:00. When PV grid connected to large capacity, the load curve will also change. For example, the peak load of a photovoltaic power park appears at about 9:00, while 10:00 ~ 14:00, the equivalent load appears to be small.

PV grid connected power generation and grid planning
With the development of photovoltaic power generation capacity, the load and anti power will show some changes, which makes the original grid to meet the demand hardly, it needs to be replanned in accordance with the actual situation, re scheduling operation mode of power grid, increased the daily workload of relevant personnel to a certain extent, also increased the capital investment.

PV grid connected power generation and scheduling
At present, the photovoltaic power generation is not mature, and the automation function is not perfect, which makes the scheduling situation difficult to change with the voltage and frequency of the power grid. Under the original scheduling, the change of the power grid data will directly lead to the reduction of the dispatching capacity of the power grid, which will make the control and scheduling of power grid more and more difficult.

Photovoltaic grid connected generation and voltage
More and more photovoltaic power is connected to the end and terminal of the feeder line of the power grid, while there is a reverse trend in power grid, which makes the current photovoltaic power generation by the influence of feeder in power grid and will produce pressure drop. The voltage of the substation side is reduced, while the load side voltage is unequal to the side voltage of the substation, which makes the load side voltage there is limit. In addition, according to the relationship of voltage and current, when the current photovoltaic power generation changes, the current is bound to be followed by the change of the power generation and photovoltaic power generation light illumination are closely related, which causes the voltage fluctuation is bigger, may cause power in reactive power regulation for frequent action. effecting adjusting device service life and the safe operation of the power grid.

Photovoltaic grid connected power generation and power grid protection
At present, the middle and low voltage power grid in China is mainly divided into two kinds: the radiation type power supply network and the ungrounded single side power supply. At present, the protection principle of substation mainly includes three kinds: automatic recloser on main feeder, fuse in branch and three stage current protection device on circuit breaker. But the current photovoltaic power generation to large capacity development, so that the grid is no longer a single source radial network into a double end even multiterminal networks caused by the fault current direction, duration and current size change, these changes may cause the circuit breaker tripping, malfunction, resulting in fuse is to lose the original selectivity and protection performance, difficult to guarantee the safe operation of power grid. In addition, the solar grid tie power system itself fault and its anti island protection function, automatic reclosing will also change.

PV grid connected power generation and distributed generation unit
A small amount of distributed generation units have little impact on the power grid, when the distributed generation unit reaches a certain limit, it will cause changes to voltage flicker, harmonics, power loss, power flow, load characteristics and other related components, leading to effect on power grid operation quality, stability and safety.

REVO Series Wall Mounted Integrated Solar Hybrid Grid Tie Inverter With Built-in MPPT Solar Controller

1.Touch screen display.
2.Output power factor PF=1.0
3.On grid with energy storage.
4.Energy generated record, load record, history information and fault record.
5.Language and time setting.
6.Structure with dust filter.
7.AC charging and AC output time setting.
8.Charging voltage and charging current timing.
9.External wi-fi device optional.
10.Parallel operation with up to only available for.
11.Smart battery charger design.

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Under the outdoor working environment, the waterproof protection of telecom power supply is must, but if the product only satisfies the IPX3 (rain) protection level which is not enough, it need to prevent the invasion of rainstorm when it is raining or snowstorm. The waterproof protection only considers the prevention of rainwater, and the prevention of water immersion is not to be considered. In some areas which often occur flood and waterlogging, the platform for outdoor communication stations should be built above 2 meters or other highlands, so that the equipment of telecom stations will not be immersed in water during disasters.

SHW48200 48VDC Outdoor Power Supply MPPT Off-Grid Telecom Station Solar Hybrid System

■Adopt advanced MCU microprocessor control technology.
■Advanced MPPT Technology,High converting efficiency higher than 97% for minimizing energy loss.
■Reversed current protection at night, over voltage and reverse polarity protection.
■Capable of selecting different charging mode for various types of batteries.
■Protection degree:IP55
■Industy-leading power density compact size and high reliability;
■Doorframe designed with waterproof structure, posted on the seal and equipped with waterproof lock on the door double insulation design;
■Cabine adopt quality galvanized sheet or aluminum coated steel sheet as material, surface coating anti-UV power;
■Suitable for outdoor installation.

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