Solar version
It's good to understand one or two with questions. First of all, we need to know what is a solar charging treasure? As the name implies, solar charging treasure must be converted from sunlight into electric energy. The principle of charging is to convert the energy of sunlight into electric energy and store it in the battery of solar mobile power supply. Among them, solar panels are needed to convert light energy. The main materials used are: monocrystalline silicon solar panels, polycrystalline silicon solar panels, amorphous silicon solar panels and multi-element composite solar panels.
What is the photoelectric conversion rate of solar panels made of different materials? Monocrystalline silicon solar panels have the highest photoelectric conversion, with conversion efficiency of 15%-24% and high cost. Because monocrystalline silicon is generally encapsulated by tempered glass and waterproof resin, it is durable, and its service life can generally reach 15 years, and the longest can reach 25 years. The photoelectric conversion efficiency of polysilicon solar panels is about 12%, the cost is lower than that of monocrystalline silicon, and the service life is also lower than that of monocrystalline silicon. Amorphous silicon solar panels consume little silicon material and low power consumption. Its main advantage is that it can generate electricity in weak light. The main problem of amorphous silicon solar panels is that the photoelectric conversion efficiency is low, and the international advanced level is about 10%, which is not stable enough. With the extension of time, its conversion efficiency will continue to decline. Application of mainstream products in the market We can see from the descriptions of various solar charging treasures with top sales volume in Taobao that there are two mainstream solar charging treasures, one is the dual-charge version of ordinary charging and solar charging (generally equipped with lithium polymer batteries), and the other is the instant charging version that only supports solar single charging.
Double packing plate
Single charge plate
Double-charged solar charging treasure basically claims to use crystalline silicon or monocrystalline silicon solar panels, but rarely mentions the light energy conversion efficiency (it is estimated that most ordinary consumers will not know much about it). Occasionally, when someone introduces the conversion rate, the product promotion also mentions that the conversion rate can reach more than 20%. Generally, the pure solar energy of a single charging version is charged by a plurality of connected solar panels (ranging from 3 to 5, the more the number, the more expensive it is), which can be folded, and the claimed photoelectric conversion efficiency is above 20%. Compared with the double-filled version, the main difference is that there are more solar panels and larger light receiving area, which are mainly made of crystalline silicon.
So when your mobile phone needs charging, how long does it take for the solar charging treasure to be fully charged? Double-charged version: I just bought a double-charged version of a solar charging treasure on 138 some time ago. The specific brand is unknown, so it can be used as an ordinary charging treasure. After personal testing, the charging treasure itself basically has no lightning flash state on sunny days with outdoor temperature above 30 degrees. Put it under the windshield of the car and charge it for about 5 hours (it's hot in the car), then charge the mobile phone. It's useless and can't be charged. I have no choice but to go back and use the adapter to charge the charging treasure. Originally, I imagined that I wouldn't need to recharge in the future, so I just put it under the windshield of the car to bask in the sun, but I was too naive.
Not bad. I bought something similar myself.
Looking back at the evaluation of similar products, I found a lot of abuse. The evaluation is not very good. I guess they all have the same expectations as me. I'll say why later. )
Price range: basically around 100- 150 yuan, and the price is not expensive. Single charge version: I haven't measured the single charge version. At present, only through investigation, product consultation of various merchants and buyer's evaluation, we know that the general mobile phone can be fully charged with a 20000 mA charging treasure (under good lighting conditions) for about 8 hours, and it can be fully charged in 2-3 hours (under good lighting conditions), but some users said that the charging effect will be attenuated after a period of time. In addition, I learned a lesson and went to see the user evaluation. Relatively speaking, the evaluation of the solar energy part is higher than that of the dual-charge version, but the overall sales data of the previous single-charge version is not as good as that of the dual-charge version, so the user base is small.