The weather is so hot, and the solar power generation should not be doubled?

Time: August 02, 2022

Let's just say that the high temperature has driven people crazy.

Some people even thought of buying solar energy to power their air conditioners.

Under this kind of weather, the UK's solar power generation reached 66.9 GWh in one day in July, which can meet 8.6% of the country's demand. Germany is said to have reached a new single-day high of solar power generation.

Could it be said that extreme high temperature can really "all harm and one benefit"?

BUT, I'm so sorry, you may be thinking too much.

Solar power generation, in fact, is also afraid of high temperature!

Too high temperature, photovoltaic power generation efficiency drops

This thing has to start with solar power generation equipment.

The principle of solar power generation is essentially to use the solar panels effect (photovoltaic effect) generated by light irradiation of semiconductors to directly convert light energy into electrical energy.

Specifically, by irradiating sunlight on the PN junction formed by the contact between the P-type semiconductor and the N-type semiconductor, after the PN junction absorbs the energy of the photon, it excites electrons and holes (moving in opposite directions), so that charges of opposite signs appear. The accumulation forms positive and negative poles, which generate a voltage.

From this perspective, more light energy does produce more electricity.

BUT, high temperature does not equal more light energy (even without sunlight the ambient temperature can be very high).

Not only that, it will seriously affect the working efficiency of semiconductors.

Affected by its own nature, the temperature stability of the semiconductor is extremely poor, and it must be kept within the range of 20 ° C ~ 30 ° C to work normally.

In addition, high temperature will also produce effects such as hot spot effect and PID effect.

The hot spot effect means that some components in the series branch are "shielded" for some reason, not only unable to generate electricity, but also used as a load to consume the energy generated by other branches.

Once a high temperature day occurs, the local high temperature will be aggravated, and the hot spot effect will be strengthened, which will directly lead to the aging and damage of the module panel.

After all, as a "big board" exposed to the outside world, photovoltaic panels will inevitably be polluted, such as bird droppings.

In normal times, bird droppings will cause a small resistance, but when high temperature occurs, it will aggravate its impact, and it is very easy to burn out components.

In addition to this, the PID effect (potential induced decay) is also exacerbated with high temperature and humidity.

Since high temperature weather is often accompanied by humidity, a large amount of water vapor in the air will enter the inside of the module through the edge-sealing silica gel or the backplane, which will cause a large amount of charge inside the solar panel to accumulate on the surface of the cell, resulting in serious performance degradation.

On the whole, the optimal temperature for solar power generation is 25°C, and if the temperature is too high, it will affect power generation.

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