How much power can a solar panel generate in a year?

- Oct 29, 2018-

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 ofJapan, and it has stagnated for many years. In July 2011,Chinaissued 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,Chinabecame 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 much electricity a photovoltaic panel can send in a year? Probably many people will blame God, yeah, how much?


This involves two determinants of photovoltaic power generation: first, the power generated by photovoltaic panels; second, the installation area of the solar 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).


For a well-known brand battery board 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 so, you have to laugh at the big teeth.


Why? Photovoltaic panels, photovoltaic panels, there is 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.


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.


For example, the annual equivalent utilization hours in Hebei Province is 1200-1600. Taking the average value of 1400 hours in the middle, it is estimated that the photovoltaic modules in the case of 285 will generate 1400 ÷ 3.5 = 400 (degrees) per year.


Now, we can answer the question – how many kilowatts a photovoltaic panel can emit in a year – 400 degrees (theoretical).


Why is it theoretical? 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, Connect the line material, surface obstruction, etc.


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.