The calculation method of longi solar panels 620w dealer: Theoretical annual power generation = Total annual average solar radiation * total area of solar cells * photoelectric conversion efficiency. However, due to the influence of various factors, the 620w dealer of longi solar panels is actually not that much. The actual annual power generation = theoretical annual power generation * actual power generation efficiency. So what are the factors that affect the 620w dealer of solar longi Solar panels? Today, the editor of Kesheng will share with you some basic knowledge about the power generation of distributed power stations.

Solar radiation

Solar cell modules are devices that convert solar energy into electrical energy, and the intensity of light radiation directly affects the power generation. The data of solar radiation in various regions can be obtained through NASA's meteorological data query website, or with the help of photovoltaic design software such as PV-SYS and RETScreen.

Tilt Angle

The data obtained from the meteorological station is generally the amount of solar radiation on a horizontal surface. Only by converting it into the amount of radiation on the inclined surface of the photovoltaic array can the power generation of the photovoltaic system be calculated. The optimal inclination Angle is related to the latitude of the project location. The approximate empirical values are as follows:

A. From 0° to 25° latitude, the inclination Angle is equal to the latitude.

B. Latitude 26° to 40°, inclination Angle equal to latitude plus 5° to 10°;

C. Latitude ranges from 41° to 55°, with an inclination Angle equal to latitude plus 10° to 15°.

System loss

Like all products, during the 25-year life cycle of photovoltaic power stations, the efficiency of components and the performance of electrical components will gradually decline, and the power generation will decrease year by year accordingly. Apart from these natural aging factors, there are also various other factors such as quality issues of components and inverters, line layout, dust, series and parallel losses, and cable losses.

In the financial model of a general photovoltaic power station, the system's power generation decreases by approximately 5% over three years and drops to 80% after 20 years.

1. Combined loss

Any series connection will cause current loss due to the current difference of the components. Parallel connection will cause voltage loss due to the voltage difference of the components. The combined loss can reach over 8%, while the standards of the China Association for Engineering Construction Standardization stipulate that it should be less than 10%.

Therefore, in order to reduce the combined loss, attention should be paid to:

1.1) Components with consistent current should be strictly selected and connected in series before the installation of the power station.

1.2) The attenuation characteristics of the components should be as consistent as possible.

2. Dust shielding

Among all the factors that affect the overall power generation capacity of photovoltaic power stations, dust is the number one killer. The main impacts of dust-based photovoltaic power stations are as follows: By blocking the light reaching the components, it affects the power generation. It affects heat dissipation, thereby influencing the conversion efficiency; Dust with acidic or alkaline properties that deposits on the surface of components for a long time erodes the board surface, causing it to become rough and uneven. This is conducive to the further accumulation of dust and simultaneously increases the diffuse reflection of sunlight. So the components need to be wiped and cleaned irregularly.

At present, the cleaning of photovoltaic power stations mainly includes three methods: water sprinklers, manual cleaning, and robots.

3. Temperature characteristics

When the temperature rises by 1℃, for crystalline silicon solar cells: the maximum output power decreases by 0.04%, the open-circuit voltage drops by 0.04%(-2mv/℃), and the short-circuit current increases by 0.04%. To reduce the impact of temperature on power generation, good ventilation conditions should be maintained for the components.

4. Losses of lines and transformers

The line loss of the DC and AC circuits of the system should be controlled within 5%. For this reason, in the design, wires with good electrical conductivity should be adopted, and the wires need to have a sufficient diameter. Special attention should be paid to whether the connectors and terminal blocks are firm during system maintenance.

5. Inverter efficiency

Due to the presence of inductors, transformers, and power devices such as IGBTs and MOSFETs, inverters will generate losses during operation. The efficiency of a general string inverter is 97-98%, that of a centralized inverter is 98%, and that of a transformer is 99%.

6. Shadows and snow cover

In distributed power stations, if there are tall buildings around, they will cast shadows on the components. These should be avoided as much as possible during the design process. According to circuit principles, when components are connected in series, the current is determined by the least number of components. Therefore, if one component has a shadow, it will affect the power generation capacity of this series of components.

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