In this engineering task, I would like to make a product that can transform energy. Electric energy is a kind of energy we use very often in our life. But we need something to help us generate electricity. The process of generating electricity is usually quite long. If we can provide electricity to our products through energy conversion, it will greatly improve the efficiency of generating electricity.

I am trying to make a solar flashlight or solar power bank. They are really useful in our daily life. Both of these products would be helpful for camper. The batteries in the flashlight are not guaranteed against accidents, and the battery bank has a limited lifespan. However, if the flashlight and charging bank can be replaced by a solar power charging method, especially in the field can ensure the normal use of these two devices.

One of a link that I like. This article, it includes all the types and models of the materials that I need to use in my solar power bank. These materials are not particularly expensive and easy to buy. It’s also very simple to make, so we can easily understand how to operate. At the same time, we can also learn about the principle of charging devices in Link. In fact, the structure of the power bank is quite simple.

After a solar flashlight converts the sun’s energy into electricity, storing it is a difficult problem. If we could design a way to store electricity, it would be hard to make. Because we need some technologies to guarantee it has a good ability to store it, and string energy is a really important process in solar flashlight.

From multiple perspectives and considerations, we decided to make a solar power bank. Based on the link above, we made some design changes. In addition to charging the phone directly through the solar panels, we considered that the phone could be powered by rechargeable lithium batteries when the sun is not shining. The lithium batteries are charged by solar panels. This ensures that the power bank will still work under some special circumstances.

The Pros of this product:

1. It is energy-efficient and environmentally friendly. This battery bank uses solar energy, recyclable green energy, to change itself. By converting solar energy into electricity, it powers the phone.
2. It’s also easy to carry around, with solar panels and batteries small enough to fit easily into a backpack or suitcase.
3. It has a wide range of charging options, as long as it has a USB port.
4. Its use conditions are simple, this charging bank does not need to be connected to an external power source, in sunlight conditions can be used to charge mobile phones and other items.

However, the cons of this product：

1. Charging may be slow
2. Solar panels may be less powerful