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Beijing Winter Olympics goes carbon neutral

It is also a solemn commitment made by Beijing when it joined hands with Zhangjiakou to bid for the 2022 Winter Olympics and Winter Paralympics. Low Carbon Management Report for the Winter Olympic Games (Pre-Games)” (hereinafter referred to as the “Report”). The Report systematically presents the work related to the carbon management of the Beijing Winter Olympic Games, focusing on the carbon neutral methodology of the Beijing Winter Olympic Games, greenhouse gas emission baseline, actual preparatory process emissions, the effectiveness of low carbon management measures, the construction of forestry carbon sink projects, and corporate sponsorship of certified carbon emission reductions. After comprehensive calculations, the carbon emissions generated by the Beijing 2022 Winter Olympics and Winter Paralympics will all be neutralized.

Beijing Winter Olympics carbon emissions to be fully neutralized

At the early stage of preparation and hosting, the baseline greenhouse gas emissions of the Beijing Winter Olympics will be about 1.637 million tons of carbon dioxide equivalent according to the relevant carbon footprint methodologies at home and abroad. According to the actual situation of preparing and holding the Beijing Winter Olympics under the epidemic, the current revised baseline emissions are about 1.306 million tons of carbon dioxide equivalent.On June 23, 2019, International Olympic Day, the “Beijing 2022 Winter Olympic Games and Winter Paralympic Games Low Carbon Management Work Program” was officially released to the public, proposing 4 low-carbon energy, low-carbon venues, low-carbon transportation, and the Beijing Winter Olympic Organizing Committee taking the lead in 18 measures in 4 aspects, such as low-carbon energy, low-carbon venues, low-carbon transportation, and the Beijing Winter Olympic Organizing Committee taking the lead, in order to minimize carbon emissions generated by the Beijing Winter Olympic Games. At the same time, carbon offsetting measures such as carbon sequestration in forestry, independent action by enterprises and carbon inclusion system have been proposed. Since the release of the Low Carbon Plan, the Beijing Winter Olympic Organizing Committee has been working closely with the Beijing and Hebei governments to promote the implementation of the measures and has achieved positive results

First, all the venues have achieved green power supply. The Zhangbei flexible DC power grid pilot demonstration project will be put into operation in 2020 to transmit renewable energy from Zhangjiakou area to Beijing in a safe and efficient manner, fully meeting the electricity demand of the Winter Olympic venues in Beijing and Zhangjiakou area. The establishment of cross-regional green power trading mechanism, through the green power trading platform, will achieve 100% use of green power in all venues at the time of the tournament.

Second, all venues will meet green building standards. All new indoor venues have reached the three-star green building standard, and existing indoor venues have reached the two-star green building standard through energy-saving renovation. The innovative organization has formulated the “Green Snow Sports Venue Evaluation Standard”, and all the new snow sports venues of the Beijing Winter Olympics meet the standard. At the same time, the Beijing Winter Olympics used carbon dioxide refrigerant with a global warming potential (GWP) of 1 and ozone depletion potential (ODP) of 0 in four ice venues, which is the first time this technology is used in the Winter Olympics.

Third, to build a low-carbon transportation system during the games. According to the principle of “using electricity in the plains and hydrogen in the mountains”, electric vehicles and hydrogen fuel cell vehicles were promoted in each competition area. At the same time, the “Traffic Resource Management System” was built to realize real-time monitoring and unified command of traffic operation during the Beijing Winter Olympic Games, which greatly improved traffic organization and operation efficiency during the event.

Fourth, the Beijing Winter Olympic Organizing Committee took the lead in demonstrating. The Beijing Winter Olympic Organizing Committee has moved into the Shougang Industrial Theme Park, comprehensively utilizing and transforming the waste factory buildings, making full use of photovoltaic power generation, solar lighting, rainwater collection and utilization technologies, and building a green and high-standard Shougang office area for the Winter Olympic Organizing Committee, which not only meets the office needs of the Winter Olympic Organizing Committee, but also plays a role in promoting the transformation and development of Shougang.

Fifth, the two governments donated forestry carbon sinks. The Beijing Municipal Government and Zhangjiakou Municipal Government completed 710,000 mu of new round of one million mu afforestation and greening project and 500,000 mu of Beijing-Hebei ecological water source protection forest construction project respectively, and commissioned professional institutions to complete the monitoring and certification of the corresponding carbon sinks, with certified carbon sinks of 530,000 tons of carbon dioxide equivalent and 570,000 tons of carbon dioxide equivalent respectively. The Beijing Municipal Government and the Hebei Provincial Government donated all the above carbon sinks to the Beijing Winter Olympic Organizing Committee free of charge.

Sixth, enterprises sponsored the certified carbon emission reductions. Three official partners of the Beijing Winter Olympic Games, including PetroChina, State Grid and Three Gorges Group, actively supported the carbon neutral work of the Beijing Winter Olympic Games by sponsoring 200,000 tons of carbon dioxide equivalent carbon sinks to the Beijing Winter Olympic Organizing Committee in the form of certified carbon emission reductions.

In short, through the joint efforts of all parties, all carbon emissions of the Beijing Winter Olympic Games will be neutralized, and the goal of “holding a carbon neutral Winter Olympic Games” will be achieved as scheduled.

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Low power generation: what have you done to the inverter?

Overseas customer feedback, said the inverter output is limited, can not be effective output. After in-depth communication, we understand that there are problems with their inverter and module configurations: the modules are over-matched too much, resulting in excessive working current some of the time, inverter current-limited operation, and some power-limited phenomena.

In fact, this situation also happens in China from time to time, and many owners have done a lot of things that are unpleasant without understanding the operation mechanism of the inverter.

(1) Make a "shield" for the inverter

Mistake: Previously, when I did research, I found that customers installed shields to protect the safety of the inverter, but this not only did not protect the machine, but also affected the heat dissipation of the machine. Especially in the hot summer, the installation of the shield will easily cause the surrounding working environment to be too hot, resulting in the overheating and derating of the inverter, which will limit the output power and affect the power generation revenue.

Correct: String inverters are all IP65 or above protection level, and do not need additional overall protection. Therefore, we only suggest two points here: first, when string inverters are installed, you can install some protective canopy on its upper part to avoid direct rainfall; in addition, when installing multiple string inverters, you should pay attention to the inverter spacing to ensure enough space for heat dissipation and follow the installation manual recommendations as much as possible.

(2) Configure too many components, thinking that the more they are equipped, the more electricity they generate

There is a saying in the north that “the spoon is big, but the bowl is accurate”, which means that the bowl is only so big, and it can’t hold more rice. In fact, the same is true for inverter module configuration. For example, the maximum output power of Shengnengjie SE-5kw inverter is 5.5KVA, even if 6kw of power is input on the input side, its output will not reach 6kw, but only 5.5kw at most, which means the output power is limited.

Considering the impact of system loss, we usually recommend different over-provisioning ratio in different areas. Because, if the inverter over allocation is too high, it will not only waste the system cost, but also make the inverter overload for a long time, resulting in lower service life.

(3) Use DC sink box for convergence

As we all know, centralized inverters will add a sink box on the DC side, mainly to connect the components of the square array in series and parallel, and add lightning protection, fuses, DC switches and other protection devices, and then unified to the DC cabinet side of the inverter.

For string inverter, the DC sink box is directly omitted, and the lightning protection and overcurrent protection units are placed inside the machine, which greatly reduces the workload of construction and maintenance. However, we also found that some users are still using the old thinking of centralized configuration.

Wrong: The number of DC terminals on the input side of the inverter directly determines how many power components can be configured. Some customers ignore the current limit conditions on the input side and parallel-connect the modules before connecting to the inverter, resulting in excessive input current and burned fuses, or even damaged terminals, which affects the power generation revenue.

Correct: The power on the input side of the inverter, i.e. the current limit, needs to be fully considered. Generally, the maximum input current of the module is around 9-10A, and the double-sided module is slightly larger, but only around 11-12A, while the DC input side current of the inverter is mostly around 12.5A, so extra attention is needed when configuring.

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How many kilowatts of electricity does a PV panel generate in a year?

The world is rich in solar energy resources. Apart from the macro events of the PV industry, let’s go back to the micro PV panels. If someone suddenly asks you how many kilowatt-hours of electricity a PV panel can generate in a year? Probably many people would be stunned, yes, how much is it? This brings us to two determinants of PV power generation.

Firstly, the power generated by the PV panel.

Secondly, the area where the PV panels are installed.

In the same area, the higher the power of the photovoltaic panels, the shorter the time it takes to generate 1 degree of electricity, and the higher the amount of electricity generated in a day.

Photovoltaic panels, there is sunlight to generate electricity. So, no electricity can be generated at night. Similarly, in windy, foggy, rainy or snowy weather, little electricity is generated. This means that photovoltaic power generation is closely related to the area of installation. Different resource areas with the same type of photovoltaic panels will produce different amounts of electricity. Some places have an inherent advantage due to the abundance of light.

To calculate an average, a PV panel can generate almost 400 kWh of electricity a year (theoretical value).

Why is this a theoretical value? This is because, in addition to the power generated by the PV panel and the area where it is installed (equivalent annual hours of use), PV power generation is also subject to external factors, such as the angle and orientation of the installation, the local climate, the material of the connection lines, and surface obstructions.

The installation of PV panels requires the angle and orientation of the installation in order for the panels to receive sufficient light to be of maximum use. If the installation is haphazard, people have an angle, you lie flat placed; people sit north facing south, you sit south facing north, and scientific deviation, but not affect the power generation!

Rainfall, snowfall, long time haze, dust storms and so on, even the sun can not see, and then the good photovoltaic panels can not generate electricity.

If you use poor quality cables and other lines, the electricity generated is secretly leaking out, and it is useless to generate more, and it is also easy to have accidents. This shows the importance of the material.

Photovoltaic panels should be cleaned from time to time. For example, if there are large trees or tall houses near the photovoltaic panels, the total light is not even a few hours, so how to fully generate electricity. This is the problem of siting. Or, the local sandy wind, only to install photovoltaic panels, but not carefully maintained, the panels are covered with dust, also can not fully generate electricity.

All of the above are factors that affect photovoltaic power generation, so in order to generate more power, you also need to take care of the maintenance oh ~