The ups and downs of the industry this year have caused many people to question the PV again. As the industry gradually picks up, PV people need to face the mistrust of the people again: Is PV really a scam?
So today I will share the two hot answers to everyone - why PV is not a scam. The author 'Wang Datou is invincible', 'The world belongs to the three bodies'.
First, from the perspective of conversion efficiency
1. First, the theoretical basis of photovoltaic power comes from Einstein's Nobel Prize.
Secondly, photovoltaic is the only stellar energy source, which is also the energy that can be used in interstellar travel. Other forms of energy are not used in space colonization or used soon.
Finally, you can't think of photovoltaics as a device, but think of it as a plant. The conversion rate of photovoltaic cells (2017) is about 40 times that of plants. The solar conversion rate of plants is 0.5% to 1%, and then plants are eaten by people. The ratio of conversion to labor is 0.02% to 0.03%, that is, the original solar energy conversion rate should be between 0.03 and 0.01%. The conversion rate of solar modules is about 17%, and then after transmission and motor release, the efficiency is About 20%, so the labor conversion rate of solar energy is about 3.4%, which is 700-1000 times that of plants. Would you like to plant such solar plants?
Second, from the perspective of power generation capacity
Introduce a concept 'energy recovery period':
The energy recovery period refers to the energy consumed by a photovoltaic system over its life cycle divided by the annual average energy output of the system, in units of years. That is, the photovoltaic system can recover the energy consumed during its life cycle within a few years.
Obviously, the shorter the payback period, the better. The energy recovery period is one of the indicators for judging renewable energy.
At present, the energy recovery period of photovoltaic power generation system is about 1.3 years. The system life is at least 25 years. Is this a scam?
1, production of photovoltaic modules
Monocrystalline silicon components: silicon material→single crystal silicon rod→single crystal square rod→single crystal silicon wafer→single crystal cell sheet→single crystal unit
Polysilicon components: silicon material → polycrystalline silicon ingot → polycrystalline square rod → polycrystalline silicon wafer → polycrystalline battery sheet → polycrystalline component
As shown below
2, the energy consumption of photovoltaic power stations:
1) Equipment. Take 60 pieces of 270Wp polysilicon components as an example.
2) Component auxiliary materials. Taking 60 polycrystalline silicon components as an example, the weight of glass is 12.93kg, and the energy consumption per ton of photovoltaic glass is 350kg standard coal. According to the equivalent of 0.1229kg standard coal of 1kWh, the photovoltaic glass consumes 0.142kWh/W. The aluminum frame is 2.8kg, with a power consumption of 13.35 million kWh per ton, the aluminum frame power consumption is 0.144 kWh/W, and the power consumption of component lamination is about 0.06 kWh/W.
3) Power plant auxiliary materials. Each 100MW power station needs 5000t steel bracket, 1500t steel bar, 850km of various cables, 0.3kWh/W energy consumption for bracket steel and steel bars, and energy consumption of cable is about 0.01kWh/W, boosting, reverse The transformer is calculated according to 0.05kWh/W.
4) Single-watt energy consumption In summary, the total energy consumption of the 270Wp component is 406.57kWh, and the unit energy consumption is 1.5kWh/W.
3, the energy recovery period of photovoltaic power station
Taking Beijing as an example. The average annual total radiation of Beijing is 1371 kWh/m2; a 1MWp photovoltaic power station adopts a distributed photovoltaic project with a fixed inclination of 36°. The annual peak hours are 1628h, considering the system efficiency of 80%. , then: The first year of power generation = 1000kW × 1302.4h × 80% = 1.32 million kWh.
Taking into account 10% attenuation in 10 years, 20% attenuation in 25 years, the average annual power generation in 25 years 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 PV power plants is: 1.5kWh ÷ 1.157 kWh/year = 1.3 years.
In addition, the two models of 'high energy consumption' and 'high pollution' that PV is put on have been officially taken off in 2016. In November 2016, the photovoltaic industry entered the list of key industries that encourage development.
Third, the photovoltaic power station is really real power generation, here is a real screenshot of the owners:
Unconsciously, some of the utility power you use now comes from photovoltaic power generation. In the past, the country built large-scale ground power stations, and now it can be installed on its own roof. After the price is online, installing a photovoltaic power station is like putting a home. Ordinary home appliances are just as usual.
Therefore, we have to tell the people loudly: Photovoltaic is not a scam!
