China has a vast territory and abundant solar energy resources. In 2000, China’s photovoltaic installations only had a 20,000-kilowatt area, which was less than 1/15 of that of Japan, and it has stagnated for many years. In July 2011, China issued the Notice of the National Development and Reform Commission on Improving the On-grid Price Policy for Solar Photovoltaic Power Generation. Encouraged by the policy, in the hard work of the whole industry, in 2015, China became the world’s largest PV application market. In 2017, the country’s new PV installed capacity was 51.06 million kilowatts, with a cumulative installed capacity of more than 1.3 trillion kilowatts.
After talking about the macroscopic events of the photovoltaic industry, return to the microscopic photovoltaic panels. If someone suddenly asks you, how many powers can a photovoltaic panel emit in a year? Probably a lot of people will blaspheme, yeah, how much?
This involves two determinants of photovoltaic power generation:
1. Photovoltaic panel power generation
2. Installation area of photovoltaic panels
In the same region, the higher the power generation of photovoltaic panels, the shorter the time spent on generating 1 kWh, and the higher the power generation in one day.
The 1 degree electricity we commonly talk about is converted to the term 1 kWh (1 kWh), which is 1000 watt hours (1000 Wh). That is, 1 degree of electricity = 1 kWh (1 kWh) = 1000 watt hours (1000 Wh).
According to a well-known brand battery board LR6-60-285M, its nominal power is 285W. Then, it takes 1000Wh ÷ 285W ≈ 3.5H to send 1 degree of electricity.
It takes 3.5 hours to send 1 degree of electricity, so is the annual power generation not 365×24÷3.5? If you do this, you have to laugh at your big teeth.
Why? Photovoltaic panels, photovoltaic panels, with sunlight to generate electricity. Therefore, it will not be able to send electricity at night. In the same way, the wind and the smog, the rain and snow, and almost no electricity. This leads to another term for photovoltaic power generation – the equivalent hours of use per year.
In 2013, the National Development and Reform Commission issued the “Notice on Playing the Role of Price Leverage to Promote the Healthy Development of the Photovoltaic Industry”. The notice is clear, according to the local solar energy resources and construction costs, the country is divided into three types of solar energy resources.
The solar resource area is divided according to the annual equivalent utilization hours. The annual equivalent utilization hours are more than 1600 hours for the Class I resource area, and the annual equivalent utilization hours are between the 1400-1600 hours for the Class II resource area. The utility hours are between Class III and 1400-1400 hours.
According to the classified I, II, and III regions of the country, the reference to the equivalent hours of use in the year, the longer the duration, indicating that the larger the solar energy resources available locally, the corresponding value will increase accordingly.
This means that photovoltaic power generation is closely related to the installation area. Different resource areas, the same type of photovoltaic panels, will also generate different amounts of electricity. In some places, there is plenty of light and it is inherently dominant.
It can be seen from the comparison table that the Hebei area belongs to the Class II and Class III areas, that is to say, the annual equivalent utilization hours are 1200-1600, and the average value of 1400 hours is calculated in the middle. The annual power generation is 1400 ÷ 3.5 = 400 (degrees).
Now, we can answer the question – how many kilowatts a photovoltaic panel can emit in a year – 400 degrees (theoretical).
Why is it a theoretical value? This is because, in addition to the photovoltaic power generation capacity and installation area (annual equivalent utilization hours), photovoltaic power generation is subject to external factors such as installation angle and orientation, local climate, connection line material, and surface occlusion. Things and so on.
Installation of photovoltaic panels requires the installation of angles and orientations in order to maximize the acceptance of the photovoltaic panels. If it is installed indiscriminately, people have angles, you are lying flat; people sitting north facing south, you are sitting south to the north, and deviate from science, but it does not affect the amount of electricity generated!
For example, there are extreme weathers that have not been seen for decades in the region. Rainfall, snowfall, smog for a long time, sandstorms, etc., even the sun can’t see, no matter how good the photovoltaic panels can’t be!
If you use a line such as a poor quality cable, the power is sneaked out, and the hair is no longer useful, and it is prone to accidents. This shows the importance of the material.
The obstructions of the photovoltaic panels should be cleaned from time to time. For example, there are big trees near the photovoltaic panels, or tall houses. The total illumination is not much, how to fully generate electricity. This is the problem of site selection. Or, the local wind and sand is large, only the photovoltaic panels are installed, but they are not carefully maintained. The panels are dusty and cannot fully generate electricity.
All of the above are factors that affect photovoltaic power generation. Therefore, the photovoltaic power generation we have just calculated is 400 degrees a year is the theoretical value. However, even the theoretical value of 400 degrees is enough. Think about the life cycle of a photovoltaic panel for about 25 years, 400 × 25 = 10000 kWh, which is several times the profit.
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