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How much electricity will one solar PV module generate per year?

How much electricity will one solar PV module generate 4 per year 3 副

As we know, China has a large territory and abundant of solar energy resources.

Do you know how many kilowatt-hours of electricity can a solar photovoltaic module generate in one year?  Probably many people will be stunned by such question. Here, let me make a brief introduction of such issue.

▲FIVESTAR Solar PV Module for Commercial Solar PV Station

To answer this question, we must first understand the two determinants of photovoltaic power generation:1,The efficiency of the solar PV module, 2, the installation location.
 In the same area, higher the solar PV module efficiency, the less time it will be to generate 1KWH electric power, as well as higher daily power output.

Take the FIVESTAR double-glass photovoltaic panel FS-M60H-335 as an example, its max power is 335W. The time it takes to generate 1 KWh of electricity is equal to 2.985 H (≈1000Wh÷335W). If you choose the same type of module with a power of 285W, the time required to generate 1 KWh of electricity is equal to 3.5H(≈1000Wh÷285W). If you choose a FIVESTAR bifacial photovoltaic module with 335W power generation, in addition to the front side power output of the module, the back side can also generate 10%-30% more electricity, which means that more electricity can be generated in the same time.

▲Fivestar Double-Glass Solar PV Module

Therefore, photovoltaic power generation is related to the power generated by the photovoltaic panel itself. Taking a 285W module as an example, it takes 3.5 hours to generate 1 KWh of electricity.  Does it mean that the annual power generation is equal to 365×24÷3.5? Of course NO. You can get the power only when there is sunlight. There is no electricity at night. Neither you can generate the power during the rainy days nor snowing day. Therefore, The value of annual solar irradiation hours of your local area in very important for deciding how much power you can get yearly.

In 2013, the China National Development and Reform Commission issued the “Notice on Using Price Leverage to Promote the Healthy Development of the Photovoltaic Industry.” The notice clearly states that the country will be divided into three types of solar resource areas based on the solar resource conditions and construction costs of various regions. The division of solar resource areas is based on the annual solar irradiation hours.

Category I Region:   Annual solar irradiation hours ≥ 1600 hours;

Category II Region:  Annual solar irradiation hours is ranged from 1400hours to 1600 hours.

Category III Region:  Annual solar irradiation hours is ranged from 1200hours to 1400 hours.

According to the category I, II, and III regions divided by the country, the longer the duration, the greater the solar energy resources available in the local area, and the value generated will increase accordingly. It means that photovoltaic power generation is closely related to the installation area. The same PV module will produce different electricity based on different resource region.

According to the table, as you can see that the Guangdong area belongs to Category III region, which means that the annual solar irradiation hours are 1200-1400H, and the minimum value is 1200 hours. If you choose 335W photovoltaic modules, the annual power generation capacity of each panel is equal to 402 KWH (= 1200 ÷2.985).  If it is in Category I and Category II regions, the annual power generation capacity of a single module is higher.

However, above it is theoretical value only. Beside of the efficiency of photovoltaic module and the installation location (Annual solar irradiation hours), photovoltaic power generation is also restricted by some other external factors, such as installation angle and orientation, local climate, connection cable material, and surface shielding Things etc.

1,The installation of photovoltaic panels requires correct installation angle and orientation, so that the photovoltaic module can fully receive more light and finally generate more electricity.

2,If it rains, snows, or the haze persists for a long time, or there is a sandstorm, even the best photovoltaic module will not generate much electricity.

3,If you use poor quality cables, the electricity generated will be secretly leaked and cause serious accidents. So it’s very important to choose the qualified material.

4,The obstruction of photovoltaic module should be cleaned from time to time. For example, if there are high trees or tall houses nearby the photovoltaic module, how can it generate electricity normally if only very poor sunlight could reach the panel? This is the problem of site selection. Furthermore, The solar module will be covered by sand or dust if long time no cleaning, the module efficiency will drop correspondingly.

Generally speaking, there are many factors that affect the photovoltaic power generation. Therefore, you should choose the right photovoltaic modules if you would like to generate achieve the best result.

FIVESTAR Double-glass solar PV modules are featured with High efficiency, Bifacial-power output, Grade-A fireproof, Zero water permeability, Longer service life (30 years), Anti-cracking & snail lines, Low operation & maintenance costs, as well as anti-acid rain, anti-salt fog, low attenuation, good heat dissipation, and strong weather resistance and adaptability. It’s the best choice are the preferred components for solar power system!

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