Technology and life: starting with solar cars

Chapter 3 Solar Panels

Hanguo Dafei Solar Panel Manufacturing Factory.

"Mr. Liu, you drink tea." Zhang Dafei, the owner of Dafei Solar Panels, poured Liu Yun a cup of tea graciously.

"It doesn't matter whether it's always or not. It doesn't matter if you have tea or not. Today I came here mainly to order a batch of solar panels from you." After speaking, Liu Yun took a few sips from the teacup, and he was indeed a little thirsty.

"Then what do you want, Mr. Liu?"

"The first point, I need you to manufacture a solar panel of 1 meter 6X1 meter 6, and add as much crystalline silicon as possible to collect solar energy in this area. As for the choice of crystalline silicon, use monocrystalline silicon. The quantity is first Let’s set a small goal and order 1 sets.”

The photoelectric conversion efficiency of monocrystalline silicon solar cells is between 15% and 24, and the conversion efficiency and life are higher than those of polycrystalline silicon, which makes the price of monocrystalline silicon more expensive.

For Liu Yun, who is determined to build a solar car, it is natural to choose the material of monocrystalline silicon.The lifespan of monocrystalline silicon is 20 years, which can last until the user's car is scrapped, avoiding the cost of replacing the solar panel in the future.

刘云开口就1万套，还是1米60厘米X1米60厘米的大小，张大飞表示惊呆了。

The scale of his factory is not small, and it is also among the best solar manufacturers in Han.

However, as an immature technology, solar energy does not have such a large market space, which also results in the low production capacity of his factory, which can only produce more than 10 solar panels of 20 cm x 1000 cm a day.

It is difficult to produce 1m x 1m6, and there are still 1 sets, so the pressure is a bit high.

Zhang Dafei said with a sad face: "Mr. Liu, your order is quite big, and our factory can't complete it in a short time. Can you see if the construction period can be longer?"

"Mr. Zhang, your structure is too small. The profit you get from my big orders is much higher than the trivial work you do. You just need to postpone those small jobs for a while. Besides, you can definitely hire those The big gods who live in the wall-mounted room add some processing, at best, it will give them a higher daily income."

"Hey, even if I work overtime in the short term, the raw materials can't keep up."

"Don't talk nonsense with me, I'll just count 500 for you. I know that the cost of making this kind of solar panel is skyrocketing 100 yuan, so I'll ask you if you want it."

Well, Zhang Dafei compromised, mainly because the other party gave too much money, and he couldn't hold it for a while.

He silently calculated that making a solar panel of this size can make a profit of 100 yuan without costing 400 yuan, and making 4 pieces would be 300 million yuan. After deducting the overtime wages of employees and the cost of hiring temporary staff, it is stable. [-] million can be left.

A profit of 300 million is not a small amount for his factory.

The pressure is a bit greater, but with a lot of money, it can still be done under pressure.

Liu Yun continued: "The second point is that the frame of the solar panel is not allowed to use an aluminum alloy frame, and the wire that conducts electricity to the battery must use 2.5 square meters of copper wire, and do not use things with low melting points such as tin wire and aluminum wire."

The focus of sunlight passing through the convex lens can produce a temperature of 600-700 degrees, the melting point of tin is 231.89 degrees, and the melting point of aluminum is 660.32 degrees.Avoid the melting of the frame and conductive wires due to excessive temperature, and prohibit the use of aluminum tin, etc.

The melting point of copper is 1083.4 degrees, and its toughness is higher than that of aluminum.

If you choose copper, you don’t have to worry about melting due to high temperature. In addition, the cost of copper is relatively low, which is suitable for mass production in the later stage. Therefore, copper is selected as the material for making the frame and power lines.

"The third point is that the length of the copper wire should be 1 meters. The outer sheath of the copper wire must be polyfluoroethylene propylene, and the outer cable sheath must be vulcanized rubber."

Copper wires will run on the roof to connect solar photovoltaic modules and 18650 battery packs. Therefore, the insulation and sheath of copper wires must be the best to avoid accidents such as electric shocks and fires that endanger personal safety.You can't cut corners in order to save costs, safety first.

"Fourth, the tempered glass used to protect the solar panel must be glass with a heat resistance of 1400 degrees and a light transmittance of over 91%, and it will be treated with ultra-clear tempering in the later stage."

Glass, as a material closely attached to solar panels, must take into account the impact of high temperature, and then use tempering to increase a little strength to better adapt to the light-gathering environment.

After hearing these four points, Zhang Dafei was immediately stunned.

As far as Liu Yun's requirements are not generally high, copper materials are good, and FEP with good insulation and heat resistance is barely acceptable.

However, the requirements for glass are a bit high. Not only light transmittance but also ultra-white tempered treatment and high transparency are required. The most important thing is that the area of ​​the glass needs to be 1 meter 6 x 1 meter 6 .

So the cost increase for glass is not the 01:30 point.

Calculated in this way, he estimated that he could earn 200, and there is actually not much left after the rent of the factory and factory.

The joy of the beginning is gone.

Hey, Zhang Dafei originally thought that Liu Yun was a winner, but in the end he just made a lot of hard money.

In other words, what is the difference between such a profit and casual work? Such a large order with low profit is not as easy as doing casual work.

He said disappointedly: "Mr. Liu, your request is a bit high. According to your request, the cost will be increased by at least 200, and my workers' wages will not be profitable at all, so I can't take this business."

Of course, Liu Yun knew that his requirements were high. Before he came, he had to make an estimate. According to the requirements, the cost of producing solar panels would be 300, and there was no profit at all.

He might consider adding another 200, but there is no need for more.Although the money of the system is spent, you can't give money all over the sky, so that others will think that others have a lot of money.

How can the other party earn 700 for 200 yuan, and 200 pieces is a profit of [-] million yuan, which is not a small amount.

What a turn of events, Zhang Dafei thought this big business was gone.As a result, the other party added more money, and now there is a profit, so it must be accepted.

Zhang Dafei excitedly took out two contracts and quickly signed his name, fearing that Liu Yun would regret it later.

Then give the signed contract to Liu Yun.

Liu Yun laughed and said, "There is no need to sign the contract, I will pay you directly."

After saying that, he took out his mobile phone and paid Zhang Dafei 700 million by scanning the QR code of Zhifubao.

"The account of Zhifubao is 700 million yuan, please pay attention to check it."

Hearing Zhifubao's voice, Zhang Dafei excitedly turned on his phone to check the balance.

It turned out to be true, the young man on the other side is really arrogant.

But if he doesn't sign the contract, isn't he afraid that I will go back on my word? If I go back on it, he has no evidence to prove it.Could it be that this young man has something to rely on?Such a thought flashed through Zhang Dafei's mind.

Then he took out his mobile phone and checked Liu Yun's Han Guo Yunfan Technology Company.

md, the paid-in capital is a string of 0, and I counted carefully a total of 1 trillion.Zhang Dafei didn't know how to describe his mood at this time, but he knew that this kind of company's money could not be hacked.

(End of this chapter)