order

Since the birth of life on the earth, warm sunshine has given us the basic conditions for survival. From a long time ago, people learned to use the sun to dry things and make food; At the beginning, people didn't care about this free resource. Until the rapid reduction of oil and natural gas resources after World War II and the arrival of the energy crisis, people began to pay more attention to solar energy, a green and renewable emerging energy.

The utilization of solar energy is mainly divided into two types: photovoltaic and photothermal. Photothermal is a common solar water heater, and photovoltaic is a power generation device that generates direct current by exposing photovoltaic panels to the sun.

This paper is to test and apply a freely spliced solar mobile power developed by Beijing Times Minxin Technology Co., Ltd., a wholly-owned subsidiary of China Aerospace Technology Co., Ltd., and hope that this kind of green and environmentally friendly renewable energy can get everyone's attention.

  Beginning of body

The writer is a person who likes to walk around with children, just Love to play computer games With this solar power supply, I applied for one as soon as possible.

"Sun Cube" is the name of this product, and the logo of China Aerospace is marked on the upper right corner of the box.

There are product specifications on the back of the packaging box. From the standard output, 5.2V-0.9A voltage and current are suitable for more than 90% of today's intelligent mobile devices; Since multiple sets can be connected in series and parallel, the maximum voltage after series connection can reach 20V. One idea is that most notebooks have a voltage of 19.5V. Can the "sun cube" after series connection also supply power to notebooks?

Let's take a look at the products in front of us first. After opening the package, we found that it was not a common solar panel, but a set of careful industrial design composed of alloy frame and Kevlar backplane. The main characteristics of Kevlar fiber are low density, high strength, good toughness, high temperature resistance, easy processing and molding. Its strength is 5 times of that of steel of the same quality, but its density is only one fifth of that of steel (Kevlar density is 1.44g per cubic centimeter, and steel density is 7.859g per cubic centimeter), which has attracted people's attention accordingly; It is also loved by military manufacturers.

Due to the following characteristics, the application level of products extends to today's technology products.

1. Permanent heat resistance and flame retardancy, with LOI greater than 28.

2. Permanent anti-static property.

3. Permanent resistance to acid, alkali and organic solvents.

4. High strength, high abrasion resistance and high tear resistance.

5. There is no molten drop and toxic gas in case of fire.

6. When burning the cloth surface, the cloth surface thickens to enhance the sealing performance without breaking.

The three dimensions of the "Sun Cube" are 190 x 105 x 9.5mm, with a net weight of 210g; There is a 0.63-inch LCD on the left side for current viewing.

On the back is the product model M5100, the maximum power is 5.1W, and the European Union's RoHS Directive on Restricting the Use of Certain Hazardous Components in Electronic and Electrical Equipment is adopted.

The two photovoltaic panels of the "Sun Cube" are spliced and connected through a ring of 9 magnetic sockets around them;

The suction can well connect the two photovoltaic panels, and the simple movement process will not separate and fall. The correct splicing method is shown in the figure above. When the magnetic socket is attracted, it is fixed through the middle fixing slot to avoid the front and back shaking of the two photovoltaic panels.

The PV panel of "Solar Cube" uses the popular monocrystalline silicon, which has the longest conversion efficiency and service life among various solar PV panels. Under normal circumstances, the conversion efficiency of single crystal silicon is 12~17%, and the service life is 20~25 years. The work is most stable. The main disadvantage is the high cost.

The output interface of the "Sun Cube" is a standard USB interface. The voltage stabilizing unit inside the interface can stabilize the voltage during use, so as to avoid the damage of voltage fluctuations to the equipment.

Because the voltage stabilizing unit is on the side, it is connected in parallel through both sides; Connected in series through the top or bottom; Series boost and parallel current increase, the maximum voltage is 20V, so the maximum number of series is 4 groups.

There are universal hanging holes in the four corners of the "Sun Cube", which can be hung on the backpack while charging.

It's cloudy today, and the output is 0.06A under the shade of trees.

The maximum output power is about 0.31A under standard sunlight on cloudy days.

  test

Test the "Sun Cube" with external ZEK equipment in sunlight; The voltage has been stable at about 4.4V due to the existence of voltage stabilizing module. The sun follows the change of clouds, and the current fluctuates greatly; The above data was collected at 15:25 Beijing time at the China Century Monument. Based on the 3100mAh - 3.8V battery of SONY mobile phone, the one-time full charge time is about 2 hours and 40 minutes.

In the single board state, the voltage is still stable, but the current is only half of the original.

Actual use effect

When you go out, hang the "Sun Cube" on your backpack and recharge your way.

During the break, put the "sun cube" under the tree and charge it slowly.

When the USB is not connected for charging, the LCD display shows an output of 0, indicating that all modules are operating normally.

summary

The "Sun Cube" uses green and renewable solar energy, which can provide continuous, efficient, temperature and safe solar charging services in real time; The appearance of the alloy frame and Kevlar back plate, together with the 9.5mm ultra-thin design, is lightweight and fashionable; LCD can monitor the current output in real time, and adjust the position to ensure the best charging effect; The magnetic splicing socket provides convenience for increasing current and voltage in the future; The main disadvantage is also the magnetic splicing socket. The magnetic force of the interface can keep the connection stable when moving normally. When there is a large scale climbing or strenuous exercise, it is very easy for the photovoltaic panel to fall off. I suggest to add a buckle lock link in the later design process, so as to reduce accidental noise in outdoor activities. The sun never sets, and charging is not easy. The "Sun Cube" provides a good emergency solution for equipment emergency when going out. Here are some recommendations.

For free trial and professional review information, you can follow the Woaiqiku official account (woaiqiku)