How long is the energy recovery period of photovoltaic power plants?

1. Production of photovoltaic modules

Monocrystalline silicon components:

Silicon materialâ†’single crystal silicon rodâ†’single crystal square rodâ†’single crystal silicon waferâ†’single crystal cell waferâ†’single crystal module

Polysilicon components:

Silicon materialâ†’Polycrystalline silicon ingotâ†’Polycrystalline square rodâ†’Polycrystalline silicon waferâ†’Polycrystalline waferâ†’Polycrystalline module

Specific as shown below

2. The energy consumption of photovoltaic power stations

The following data comes from: China Photovoltaic Industry Association

1) Equipment

Take a 60-chip, 270Wp polysilicon component as an example.

2) Component Accessories

Taking 60 polysilicon components as an example, the weight of glass is 12.93kg, and 350kg of standard coal is consumed per ton of photovoltaic glass, and the equivalent of 0.1229kg of standard coal is calculated at 1kWh. The power consumption of photovoltaic glass is 0.142kWh/W, and the aluminum frame is 2.8kg. The consumption of electricity per ton is 13,35 thousand degrees, the power consumption of aluminum frame is 0.144 kWh/W, and the power consumption of components such as lamination is about 0.06 kWh/W.

3) Power station auxiliary materials

Each 100 MW power station needs 5000t steel brackets, 1,500t steel bars, and 850km of various types of cables. The energy consumption of the steel and steel bars is 0.3kWh/W. The energy consumption of the cables is about 0.01kWh/W, and the step-up transformer and inverter are 0.05kWh. /W calculation.

4) Single Watt Energy Consumption

In summary, the total energy consumption of the 270Wp module is 406.57kWh, and the unit energy consumption is 1.5kWh/W.

3, the energy recovery period of photovoltaic power plant

Take Beijing as an example, Beijing's annual average annual total radiation is 1371kWh/m2; a 1MWp photovoltaic power plant with a fixed angle of 36Â° distributed photovoltaic project, the annual peak hours is 1628h, considering the 80% system efficiency ,then:

The first year's power generation = 1000kW x 1302.4h x 80% = 1.30 million kWh

Considering 10% attenuation in 10 years and 20% in 25 years, the 25-year average annual power generation is about 1.157 million kWh.

The average annual power generation of 1MWp PV modules is 1.157 million kWh, and the single-watt power generation is 1.157kWh.

The energy recovery period of photovoltaic power plants is:

1.5kWhÃ·1.157kWh/year=1.3years

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